Re: [beagleboard] Re: battery power for PocketBeagle?

[Taivas Gogoljuk]

I connected a 6v 5amp battery and it broke my bricked my pocket beagle.
On Thursday, November 22, 2018 at 6:23:51 PM UTC+2 fek...@gmail.com wrote:

> Hello, I had to put the charging project on hold but will pick it up again 
> soon. I probably blocked excessively on finding an acceptable 10K NTC 
> thermistor with the right B= value.
>
> On Tue, Nov 20, 2018 at 9:25 AM Jason Kridner  wrote:
>
>> On Thursday, September 6, 2018 at 10:22:38 AM UTC-4, Fred Kerr wrote:
>>>
>>> I am concerned about the battery temperature for safety in my office, 
>>> house, and around my 4-year-old son. :) And I'm curious about logging stuff 
>>> infinitum.
>>>
>>> I have it working with a fixed resistor (without attempting charging 
>>> yet).
>>>
>>
>> Did you ever get your thermistor working and enable charging?
>>  
>>
> On Thu, Sep 6, 2018 at 7:18 AM Graham Haddock wrote:
>>>
>> Fred:
 The temperature coefficient is only important if you are going to use 
 them as temperature monitors, and you are going to thermally/mechanically 
 attach them to the battery.

 If you are just trying to get the battery power supply to run, and are 
 not concerned about battery temperatures, a fixed resistor will work fine.

 --- Graham

 ==

 On Thu, Sep 6, 2018 at 3:34 AM Fred Kerr wrote:

>>> I am looking for 10K NTC Thermistors with B=3480. How critical is the B 
> value, or what range can I accept? Currently I am looking on Mouser.
>
> Is there a specific or recommended battery pack? I'm just using an 
> 18650 from a local surplus store.
>
> Regarding the log file, I still need to do this:
>
> sudo /opt/scripts/tools/developers/update_bootloader.sh
>
> I'll also look for 100K thermistor with B=3960
>

> On Thursday, August 30, 2018 at 5:35:43 PM UTC-7, Fred Kerr wrote:
>
 It runs well with the soldered implementation. My breadboards are a 
>> little cheap.
>>
>> The attached minicom_20180830b.cap shows a boot with microUSB power 
>> from a wall wart (from my rpi3), then a boot with the battery circuit. I 
>> left both RX and TX attached; I'll play with disconnecting them another 
>> time.
>>
>> I'll look into getting some "telemetry" info from the pocket beagle. 
>> I'm open to suggestions about things to add/log, etc. Also, I think this 
>> pocket beagle doesn't have a fix that I got before - after the shutdown, 
>> things panic.
>>
>> If anything else jumps out from the log file, please let me know!
>>
>
>> On Wednesday, August 29, 2018 at 10:59:03 AM UTC-7, Fred Kerr wrote:
>>
> I'll try again soon with my more stable circuit (*soldered), also with 
>>> RX disconnected so I just get output from the Pocket Beagle and the 
>>> only 
>>> power input is from the battery circuit. 
>>>
>>> (*Soldered, so no loose breadboard connections, better current 
>>> carrying capacity, etc.)
>>>
>>> What is a good way to share log files? Mine can get verbose! I could 
>>> store it somewhere and post a link - suggestions welcomed! I have a lot 
>>> of 
>>> possibilities, but just let me know what works best for you.
>>>
>>> On Tuesday, August 28, 2018 at 12:51:23 PM UTC-7, Fred Kerr wrote:
>>>
>> Yes, it ran quite a lot longer on the 1F, but still hung.

 I wired this up (see pic) to be more stable than the breadboard 
 mess I had. The led on 1.8k resistor is gonna run a lot longer than 
 I'll 
 take at lunch!!!

 Can I isolate RX and TX or...oh I just need TX from the beagle for 
 visibility!

 1F 5.5v supercap (that battery was discharged to 3.96v). This one 
 has more charge. Also put a 1000uf electrolytic on the soldered 
 version, 
 "because".

 Fred Kerr (mobile)

 On Tue, Aug 28, 2018, 12:13 PM Jason Kridner wrote:

>>>
>
> On Monday, August 27, 2018 at 11:15:36 PM UTC-4, Fred Kerr wrote:
>>
>> Hello all,
>>
>> I'm being just a little bit careful here:
>>
>> I'm about to try this, but I will connect up the serial terminal 
>> first, so I can see output and interact with the board. (Graceful 
>> shutdown!)
>>
>
> Don't connect the power or RX (ie., serial cable to PocketBeagle) 
> signals to avoid them interfering. Great thing to monitor.
>  
>
>>
>> I will test the serial connection first with just a micro USB 
>> charging cable rather than USB to a computer. (Simplify!)
>>
>
> Not sure what you are testing here. Are you just saying you'll 
> power via the microUSB connection and not connect to a computer, just 
> to 
> see the behavior? You are monitoring with a 

Re: [beagleboard] Re: battery power for PocketBeagle?

[Fred Kerr]

Hello, I had to put the charging project on hold but will pick it up again
soon. I probably blocked excessively on finding an acceptable 10K NTC
thermistor with the right B= value.

On Tue, Nov 20, 2018 at 9:25 AM Jason Kridner  wrote:

> On Thursday, September 6, 2018 at 10:22:38 AM UTC-4, Fred Kerr wrote:
>>
>> I am concerned about the battery temperature for safety in my office,
>> house, and around my 4-year-old son. :) And I'm curious about logging stuff
>> infinitum.
>>
>> I have it working with a fixed resistor (without attempting charging yet).
>>
>
> Did you ever get your thermistor working and enable charging?
>
>
>>
>> On Thu, Sep 6, 2018 at 7:18 AM Graham Haddock wrote:
>>
>>> Fred:
>>> The temperature coefficient is only important if you are going to use
>>> them as temperature monitors, and you are going to thermally/mechanically
>>> attach them to the battery.
>>>
>>> If you are just trying to get the battery power supply to run, and are
>>> not concerned about battery temperatures, a fixed resistor will work fine.
>>>
>>> --- Graham
>>>
>>> ==
>>>
>>> On Thu, Sep 6, 2018 at 3:34 AM Fred Kerr wrote:
>>>
 I am looking for 10K NTC Thermistors with B=3480. How critical is the B
 value, or what range can I accept? Currently I am looking on Mouser.

 Is there a specific or recommended battery pack? I'm just using an
 18650 from a local surplus store.

 Regarding the log file, I still need to do this:

 sudo /opt/scripts/tools/developers/update_bootloader.sh

 I'll also look for 100K thermistor with B=3960

 On Thursday, August 30, 2018 at 5:35:43 PM UTC-7, Fred Kerr wrote:
>
> It runs well with the soldered implementation. My breadboards are a
> little cheap.
>
> The attached minicom_20180830b.cap shows a boot with microUSB power
> from a wall wart (from my rpi3), then a boot with the battery circuit. I
> left both RX and TX attached; I'll play with disconnecting them another
> time.
>
> I'll look into getting some "telemetry" info from the pocket beagle.
> I'm open to suggestions about things to add/log, etc. Also, I think this
> pocket beagle doesn't have a fix that I got before - after the shutdown,
> things panic.
>
> If anything else jumps out from the log file, please let me know!
>
> On Wednesday, August 29, 2018 at 10:59:03 AM UTC-7, Fred Kerr wrote:
>>
>> I'll try again soon with my more stable circuit (*soldered), also
>> with RX disconnected so I just get output from the Pocket Beagle and the
>> only power input is from the battery circuit.
>>
>> (*Soldered, so no loose breadboard connections, better current
>> carrying capacity, etc.)
>>
>> What is a good way to share log files? Mine can get verbose! I could
>> store it somewhere and post a link - suggestions welcomed! I have a lot 
>> of
>> possibilities, but just let me know what works best for you.
>>
>> On Tuesday, August 28, 2018 at 12:51:23 PM UTC-7, Fred Kerr wrote:
>>>
>>> Yes, it ran quite a lot longer on the 1F, but still hung.
>>>
>>> I wired this up (see pic) to be more stable than the breadboard mess
>>> I had. The led on 1.8k resistor is gonna run a lot longer than I'll 
>>> take at
>>> lunch!!!
>>>
>>> Can I isolate RX and TX or...oh I just need TX from the beagle for
>>> visibility!
>>>
>>> 1F 5.5v supercap (that battery was discharged to 3.96v). This one
>>> has more charge. Also put a 1000uf electrolytic on the soldered version,
>>> "because".
>>>
>>> Fred Kerr (mobile)
>>>
>>> On Tue, Aug 28, 2018, 12:13 PM Jason Kridner wrote:
>>>


 On Monday, August 27, 2018 at 11:15:36 PM UTC-4, Fred Kerr wrote:
>
> Hello all,
>
> I'm being just a little bit careful here:
>
> I'm about to try this, but I will connect up the serial terminal
> first, so I can see output and interact with the board. (Graceful 
> shutdown!)
>

 Don't connect the power or RX (ie., serial cable to PocketBeagle)
 signals to avoid them interfering. Great thing to monitor.


>
> I will test the serial connection first with just a micro USB
> charging cable rather than USB to a computer. (Simplify!)
>

 Not sure what you are testing here. Are you just saying you'll
 power via the microUSB connection and not connect to a computer, just 
 to
 see the behavior? You are monitoring with a serial connection?


>
> It's my understanding that LiPo charging is disabled or not
> present in the firmware. (I'll give you the "uname -a" and other info 
> the
> next time I fire it up. Just let me know what and how to check.)
>

 It is not 

Re: [beagleboard] Re: battery power for PocketBeagle?

[Jason Kridner]

On Thursday, September 6, 2018 at 10:22:38 AM UTC-4, Fred Kerr wrote:
>
> I am concerned about the battery temperature for safety in my office, 
> house, and around my 4-year-old son. :) And I'm curious about logging stuff 
> infinitum.
>
> I have it working with a fixed resistor (without attempting charging yet).
>

Did you ever get your thermistor working and enable charging?
 

>
> On Thu, Sep 6, 2018 at 7:18 AM Graham Haddock wrote:
>
>> Fred:
>> The temperature coefficient is only important if you are going to use 
>> them as temperature monitors, and you are going to thermally/mechanically 
>> attach them to the battery.
>>
>> If you are just trying to get the battery power supply to run, and are 
>> not concerned about battery temperatures, a fixed resistor will work fine.
>>
>> --- Graham
>>
>> ==
>>
>> On Thu, Sep 6, 2018 at 3:34 AM Fred Kerr wrote:
>>
>>> I am looking for 10K NTC Thermistors with B=3480. How critical is the B 
>>> value, or what range can I accept? Currently I am looking on Mouser.
>>>
>>> Is there a specific or recommended battery pack? I'm just using an 18650 
>>> from a local surplus store.
>>>
>>> Regarding the log file, I still need to do this:
>>>
>>> sudo /opt/scripts/tools/developers/update_bootloader.sh
>>>
>>> I'll also look for 100K thermistor with B=3960
>>>
>>> On Thursday, August 30, 2018 at 5:35:43 PM UTC-7, Fred Kerr wrote:

 It runs well with the soldered implementation. My breadboards are a 
 little cheap.

 The attached minicom_20180830b.cap shows a boot with microUSB power 
 from a wall wart (from my rpi3), then a boot with the battery circuit. I 
 left both RX and TX attached; I'll play with disconnecting them another 
 time.

 I'll look into getting some "telemetry" info from the pocket beagle. 
 I'm open to suggestions about things to add/log, etc. Also, I think this 
 pocket beagle doesn't have a fix that I got before - after the shutdown, 
 things panic.

 If anything else jumps out from the log file, please let me know!

 On Wednesday, August 29, 2018 at 10:59:03 AM UTC-7, Fred Kerr wrote:
>
> I'll try again soon with my more stable circuit (*soldered), also with 
> RX disconnected so I just get output from the Pocket Beagle and the only 
> power input is from the battery circuit. 
>
> (*Soldered, so no loose breadboard connections, better current 
> carrying capacity, etc.)
>
> What is a good way to share log files? Mine can get verbose! I could 
> store it somewhere and post a link - suggestions welcomed! I have a lot 
> of 
> possibilities, but just let me know what works best for you.
>
> On Tuesday, August 28, 2018 at 12:51:23 PM UTC-7, Fred Kerr wrote:
>>
>> Yes, it ran quite a lot longer on the 1F, but still hung.
>>
>> I wired this up (see pic) to be more stable than the breadboard mess 
>> I had. The led on 1.8k resistor is gonna run a lot longer than I'll take 
>> at 
>> lunch!!!
>>
>> Can I isolate RX and TX or...oh I just need TX from the beagle for 
>> visibility!
>>
>> 1F 5.5v supercap (that battery was discharged to 3.96v). This one has 
>> more charge. Also put a 1000uf electrolytic on the soldered version, 
>> "because".
>>
>> Fred Kerr (mobile)
>>
>> On Tue, Aug 28, 2018, 12:13 PM Jason Kridner wrote:
>>
>>>
>>>
>>> On Monday, August 27, 2018 at 11:15:36 PM UTC-4, Fred Kerr wrote:

 Hello all,

 I'm being just a little bit careful here:

 I'm about to try this, but I will connect up the serial terminal 
 first, so I can see output and interact with the board. (Graceful 
 shutdown!)

>>>
>>> Don't connect the power or RX (ie., serial cable to PocketBeagle) 
>>> signals to avoid them interfering. Great thing to monitor.
>>>  
>>>

 I will test the serial connection first with just a micro USB 
 charging cable rather than USB to a computer. (Simplify!)

>>>
>>> Not sure what you are testing here. Are you just saying you'll power 
>>> via the microUSB connection and not connect to a computer, just to see 
>>> the 
>>> behavior? You are monitoring with a serial connection?
>>>  
>>>

 It's my understanding that LiPo charging is disabled or not present 
 in the firmware. (I'll give you the "uname -a" and other info the next 
 time 
 I fire it up. Just let me know what and how to check.)

>>>
>>> It is not enabled by default. There is a flag in the PMIC that needs 
>>> to be enabled. We've been playing with a driver to set the flag, but 
>>> there 
>>> are other bugs in that driver not related to actually charging.
>>>  
>>>

 Also, it's not clear (without reading the data sheet :) ) about the 

Re: [beagleboard] Re: battery power for PocketBeagle?

[Fred Kerr]

I am concerned about the battery temperature for safety in my office,
house, and around my 4-year-old son. :) And I'm curious about logging stuff
infinitum.

I have it working with a fixed resistor (without attempting charging yet).

On Thu, Sep 6, 2018 at 7:18 AM Graham Haddock  wrote:

> Fred:
> The temperature coefficient is only important if you are going to use them
> as temperature monitors, and you are going to thermally/mechanically attach
> them to the battery.
>
> If you are just trying to get the battery power supply to run, and are not
> concerned about battery temperatures, a fixed resistor will work fine.
>
> --- Graham
>
> ==
>
> On Thu, Sep 6, 2018 at 3:34 AM Fred Kerr  wrote:
>
>> I am looking for 10K NTC Thermistors with B=3480. How critical is the B
>> value, or what range can I accept? Currently I am looking on Mouser.
>>
>> Is there a specific or recommended battery pack? I'm just using an 18650
>> from a local surplus store.
>>
>> Regarding the log file, I still need to do this:
>>
>> sudo /opt/scripts/tools/developers/update_bootloader.sh
>>
>> I'll also look for 100K thermistor with B=3960
>>
>> On Thursday, August 30, 2018 at 5:35:43 PM UTC-7, Fred Kerr wrote:
>>>
>>> It runs well with the soldered implementation. My breadboards are a
>>> little cheap.
>>>
>>> The attached minicom_20180830b.cap shows a boot with microUSB power from
>>> a wall wart (from my rpi3), then a boot with the battery circuit. I left
>>> both RX and TX attached; I'll play with disconnecting them another time.
>>>
>>> I'll look into getting some "telemetry" info from the pocket beagle. I'm
>>> open to suggestions about things to add/log, etc. Also, I think this pocket
>>> beagle doesn't have a fix that I got before - after the shutdown, things
>>> panic.
>>>
>>> If anything else jumps out from the log file, please let me know!
>>>
>>> On Wednesday, August 29, 2018 at 10:59:03 AM UTC-7, Fred Kerr wrote:

 I'll try again soon with my more stable circuit (*soldered), also with
 RX disconnected so I just get output from the Pocket Beagle and the only
 power input is from the battery circuit.

 (*Soldered, so no loose breadboard connections, better current carrying
 capacity, etc.)

 What is a good way to share log files? Mine can get verbose! I could
 store it somewhere and post a link - suggestions welcomed! I have a lot of
 possibilities, but just let me know what works best for you.

 On Tuesday, August 28, 2018 at 12:51:23 PM UTC-7, Fred Kerr wrote:
>
> Yes, it ran quite a lot longer on the 1F, but still hung.
>
> I wired this up (see pic) to be more stable than the breadboard mess I
> had. The led on 1.8k resistor is gonna run a lot longer than I'll take at
> lunch!!!
>
> Can I isolate RX and TX or...oh I just need TX from the beagle for
> visibility!
>
> 1F 5.5v supercap (that battery was discharged to 3.96v). This one has
> more charge. Also put a 1000uf electrolytic on the soldered version,
> "because".
>
> Fred Kerr (mobile)
>
> On Tue, Aug 28, 2018, 12:13 PM Jason Kridner 
> wrote:
>
>>
>>
>> On Monday, August 27, 2018 at 11:15:36 PM UTC-4, Fred Kerr wrote:
>>>
>>> Hello all,
>>>
>>> I'm being just a little bit careful here:
>>>
>>> I'm about to try this, but I will connect up the serial terminal
>>> first, so I can see output and interact with the board. (Graceful 
>>> shutdown!)
>>>
>>
>> Don't connect the power or RX (ie., serial cable to PocketBeagle)
>> signals to avoid them interfering. Great thing to monitor.
>>
>>
>>>
>>> I will test the serial connection first with just a micro USB
>>> charging cable rather than USB to a computer. (Simplify!)
>>>
>>
>> Not sure what you are testing here. Are you just saying you'll power
>> via the microUSB connection and not connect to a computer, just to see 
>> the
>> behavior? You are monitoring with a serial connection?
>>
>>
>>>
>>> It's my understanding that LiPo charging is disabled or not present
>>> in the firmware. (I'll give you the "uname -a" and other info the next 
>>> time
>>> I fire it up. Just let me know what and how to check.)
>>>
>>
>> It is not enabled by default. There is a flag in the PMIC that needs
>> to be enabled. We've been playing with a driver to set the flag, but 
>> there
>> are other bugs in that driver not related to actually charging.
>>
>>
>>>
>>> Also, it's not clear (without reading the data sheet :) ) about the
>>> resistor values for the thermistor and the parallel (linearizing?) 
>>> resistor.
>>>
>>> If you have a 10K thermistor, do you put it in parallel with a 10K
>>> resistor, or likewise 100K thermistor in parallel with a 100K resistor? 
>>> Do
>>> you put the thermistor anywhere in contact 

Re: [beagleboard] Re: battery power for PocketBeagle?

[Graham Haddock]

Fred:
The temperature coefficient is only important if you are going to use them
as temperature monitors, and you are going to thermally/mechanically attach
them to the battery.

If you are just trying to get the battery power supply to run, and are not
concerned about battery temperatures, a fixed resistor will work fine.

--- Graham

==

On Thu, Sep 6, 2018 at 3:34 AM Fred Kerr  wrote:

> I am looking for 10K NTC Thermistors with B=3480. How critical is the B
> value, or what range can I accept? Currently I am looking on Mouser.
>
> Is there a specific or recommended battery pack? I'm just using an 18650
> from a local surplus store.
>
> Regarding the log file, I still need to do this:
>
> sudo /opt/scripts/tools/developers/update_bootloader.sh
>
> I'll also look for 100K thermistor with B=3960
>
> On Thursday, August 30, 2018 at 5:35:43 PM UTC-7, Fred Kerr wrote:
>>
>> It runs well with the soldered implementation. My breadboards are a
>> little cheap.
>>
>> The attached minicom_20180830b.cap shows a boot with microUSB power from
>> a wall wart (from my rpi3), then a boot with the battery circuit. I left
>> both RX and TX attached; I'll play with disconnecting them another time.
>>
>> I'll look into getting some "telemetry" info from the pocket beagle. I'm
>> open to suggestions about things to add/log, etc. Also, I think this pocket
>> beagle doesn't have a fix that I got before - after the shutdown, things
>> panic.
>>
>> If anything else jumps out from the log file, please let me know!
>>
>> On Wednesday, August 29, 2018 at 10:59:03 AM UTC-7, Fred Kerr wrote:
>>>
>>> I'll try again soon with my more stable circuit (*soldered), also with
>>> RX disconnected so I just get output from the Pocket Beagle and the only
>>> power input is from the battery circuit.
>>>
>>> (*Soldered, so no loose breadboard connections, better current carrying
>>> capacity, etc.)
>>>
>>> What is a good way to share log files? Mine can get verbose! I could
>>> store it somewhere and post a link - suggestions welcomed! I have a lot of
>>> possibilities, but just let me know what works best for you.
>>>
>>> On Tuesday, August 28, 2018 at 12:51:23 PM UTC-7, Fred Kerr wrote:

 Yes, it ran quite a lot longer on the 1F, but still hung.

 I wired this up (see pic) to be more stable than the breadboard mess I
 had. The led on 1.8k resistor is gonna run a lot longer than I'll take at
 lunch!!!

 Can I isolate RX and TX or...oh I just need TX from the beagle for
 visibility!

 1F 5.5v supercap (that battery was discharged to 3.96v). This one has
 more charge. Also put a 1000uf electrolytic on the soldered version,
 "because".

 Fred Kerr (mobile)

 On Tue, Aug 28, 2018, 12:13 PM Jason Kridner 
 wrote:

>
>
> On Monday, August 27, 2018 at 11:15:36 PM UTC-4, Fred Kerr wrote:
>>
>> Hello all,
>>
>> I'm being just a little bit careful here:
>>
>> I'm about to try this, but I will connect up the serial terminal
>> first, so I can see output and interact with the board. (Graceful 
>> shutdown!)
>>
>
> Don't connect the power or RX (ie., serial cable to PocketBeagle)
> signals to avoid them interfering. Great thing to monitor.
>
>
>>
>> I will test the serial connection first with just a micro USB
>> charging cable rather than USB to a computer. (Simplify!)
>>
>
> Not sure what you are testing here. Are you just saying you'll power
> via the microUSB connection and not connect to a computer, just to see the
> behavior? You are monitoring with a serial connection?
>
>
>>
>> It's my understanding that LiPo charging is disabled or not present
>> in the firmware. (I'll give you the "uname -a" and other info the next 
>> time
>> I fire it up. Just let me know what and how to check.)
>>
>
> It is not enabled by default. There is a flag in the PMIC that needs
> to be enabled. We've been playing with a driver to set the flag, but there
> are other bugs in that driver not related to actually charging.
>
>
>>
>> Also, it's not clear (without reading the data sheet :) ) about the
>> resistor values for the thermistor and the parallel (linearizing?) 
>> resistor.
>>
>> If you have a 10K thermistor, do you put it in parallel with a 10K
>> resistor, or likewise 100K thermistor in parallel with a 100K resistor? 
>> Do
>> you put the thermistor anywhere in contact with the (e.g., 18650) LiPo?
>>
>
> Looking at the TPS65217 datasheet says to put a 75kohm resistor in
> parallel.
>
> I'm not sure, but I believe the actual thermal resistor should be
> something like
> https://www.ametherm.com/blog/thermistors/thermistors-ntc-thermistor-temperature-sensors-provide-li-ion-battery-safety/
> .
>
>
>>
>> From the prior thread, it seems to be sufficient 

Re: [beagleboard] Re: battery power for PocketBeagle?

[Fred Kerr]

I am looking for 10K NTC Thermistors with B=3480. How critical is the B 
value, or what range can I accept? Currently I am looking on Mouser.

Is there a specific or recommended battery pack? I'm just using an 18650 
from a local surplus store.

Regarding the log file, I still need to do this:

sudo /opt/scripts/tools/developers/update_bootloader.sh

I'll also look for 100K thermistor with B=3960

On Thursday, August 30, 2018 at 5:35:43 PM UTC-7, Fred Kerr wrote:
>
> It runs well with the soldered implementation. My breadboards are a little 
> cheap.
>
> The attached minicom_20180830b.cap shows a boot with microUSB power from a 
> wall wart (from my rpi3), then a boot with the battery circuit. I left both 
> RX and TX attached; I'll play with disconnecting them another time.
>
> I'll look into getting some "telemetry" info from the pocket beagle. I'm 
> open to suggestions about things to add/log, etc. Also, I think this pocket 
> beagle doesn't have a fix that I got before - after the shutdown, things 
> panic.
>
> If anything else jumps out from the log file, please let me know!
>
> On Wednesday, August 29, 2018 at 10:59:03 AM UTC-7, Fred Kerr wrote:
>>
>> I'll try again soon with my more stable circuit (*soldered), also with RX 
>> disconnected so I just get output from the Pocket Beagle and the only power 
>> input is from the battery circuit. 
>>
>> (*Soldered, so no loose breadboard connections, better current carrying 
>> capacity, etc.)
>>
>> What is a good way to share log files? Mine can get verbose! I could 
>> store it somewhere and post a link - suggestions welcomed! I have a lot of 
>> possibilities, but just let me know what works best for you.
>>
>> On Tuesday, August 28, 2018 at 12:51:23 PM UTC-7, Fred Kerr wrote:
>>>
>>> Yes, it ran quite a lot longer on the 1F, but still hung.
>>>
>>> I wired this up (see pic) to be more stable than the breadboard mess I 
>>> had. The led on 1.8k resistor is gonna run a lot longer than I'll take at 
>>> lunch!!!
>>>
>>> Can I isolate RX and TX or...oh I just need TX from the beagle for 
>>> visibility!
>>>
>>> 1F 5.5v supercap (that battery was discharged to 3.96v). This one has 
>>> more charge. Also put a 1000uf electrolytic on the soldered version, 
>>> "because".
>>>
>>> Fred Kerr (mobile)
>>>
>>> On Tue, Aug 28, 2018, 12:13 PM Jason Kridner  wrote:
>>>


 On Monday, August 27, 2018 at 11:15:36 PM UTC-4, Fred Kerr wrote:
>
> Hello all,
>
> I'm being just a little bit careful here:
>
> I'm about to try this, but I will connect up the serial terminal 
> first, so I can see output and interact with the board. (Graceful 
> shutdown!)
>

 Don't connect the power or RX (ie., serial cable to PocketBeagle) 
 signals to avoid them interfering. Great thing to monitor.
  

>
> I will test the serial connection first with just a micro USB charging 
> cable rather than USB to a computer. (Simplify!)
>

 Not sure what you are testing here. Are you just saying you'll power 
 via the microUSB connection and not connect to a computer, just to see the 
 behavior? You are monitoring with a serial connection?
  

>
> It's my understanding that LiPo charging is disabled or not present in 
> the firmware. (I'll give you the "uname -a" and other info the next time 
> I 
> fire it up. Just let me know what and how to check.)
>

 It is not enabled by default. There is a flag in the PMIC that needs to 
 be enabled. We've been playing with a driver to set the flag, but there 
 are 
 other bugs in that driver not related to actually charging.
  

>
> Also, it's not clear (without reading the data sheet :) ) about the 
> resistor values for the thermistor and the parallel (linearizing?) 
> resistor.
>
> If you have a 10K thermistor, do you put it in parallel with a 10K 
> resistor, or likewise 100K thermistor in parallel with a 100K resistor? 
> Do 
> you put the thermistor anywhere in contact with the (e.g., 18650) LiPo?
>

 Looking at the TPS65217 datasheet says to put a 75kohm resistor in 
 parallel.

 I'm not sure, but I believe the actual thermal resistor should be 
 something like 
 https://www.ametherm.com/blog/thermistors/thermistors-ntc-thermistor-temperature-sensors-provide-li-ion-battery-safety/
 . 
  

>
> From the prior thread, it seems to be sufficient (if even necessary) 
> just to connect a 10K resistor from TS (P2-16) to ground (P2-15).
>

 Yes, that is supposed to work, ignoring the battery temperature.
  

>
> 10uF cap from battery (P2-14) to ground (P2-15).
>
> (Tangent/future: What about larger cap, perhaps using a 5.5V supercap, 
> detect supercap discharging (lipo voltage to ~min input voltage on vbat) 
> and give an interrupt to shut the board down?)
>
>

Re: [beagleboard] Re: battery power for PocketBeagle?

[Fred Kerr]

It runs well with the soldered implementation. My breadboards are a little 
cheap.

The attached minicom_20180830b.cap shows a boot with microUSB power from a 
wall wart (from my rpi3), then a boot with the battery circuit. I left both 
RX and TX attached; I'll play with disconnecting them another time.

I'll look into getting some "telemetry" info from the pocket beagle. I'm 
open to suggestions about things to add/log, etc. Also, I think this pocket 
beagle doesn't have a fix that I got before - after the shutdown, things 
panic.

If anything else jumps out from the log file, please let me know!

On Wednesday, August 29, 2018 at 10:59:03 AM UTC-7, Fred Kerr wrote:
>
> I'll try again soon with my more stable circuit (*soldered), also with RX 
> disconnected so I just get output from the Pocket Beagle and the only power 
> input is from the battery circuit. 
>
> (*Soldered, so no loose breadboard connections, better current carrying 
> capacity, etc.)
>
> What is a good way to share log files? Mine can get verbose! I could store 
> it somewhere and post a link - suggestions welcomed! I have a lot of 
> possibilities, but just let me know what works best for you.
>
> On Tuesday, August 28, 2018 at 12:51:23 PM UTC-7, Fred Kerr wrote:
>>
>> Yes, it ran quite a lot longer on the 1F, but still hung.
>>
>> I wired this up (see pic) to be more stable than the breadboard mess I 
>> had. The led on 1.8k resistor is gonna run a lot longer than I'll take at 
>> lunch!!!
>>
>> Can I isolate RX and TX or...oh I just need TX from the beagle for 
>> visibility!
>>
>> 1F 5.5v supercap (that battery was discharged to 3.96v). This one has 
>> more charge. Also put a 1000uf electrolytic on the soldered version, 
>> "because".
>>
>> Fred Kerr (mobile)
>>
>> On Tue, Aug 28, 2018, 12:13 PM Jason Kridner  wrote:
>>
>>>
>>>
>>> On Monday, August 27, 2018 at 11:15:36 PM UTC-4, Fred Kerr wrote:

 Hello all,

 I'm being just a little bit careful here:

 I'm about to try this, but I will connect up the serial terminal first, 
 so I can see output and interact with the board. (Graceful shutdown!)

>>>
>>> Don't connect the power or RX (ie., serial cable to PocketBeagle) 
>>> signals to avoid them interfering. Great thing to monitor.
>>>  
>>>

 I will test the serial connection first with just a micro USB charging 
 cable rather than USB to a computer. (Simplify!)

>>>
>>> Not sure what you are testing here. Are you just saying you'll power via 
>>> the microUSB connection and not connect to a computer, just to see the 
>>> behavior? You are monitoring with a serial connection?
>>>  
>>>

 It's my understanding that LiPo charging is disabled or not present in 
 the firmware. (I'll give you the "uname -a" and other info the next time I 
 fire it up. Just let me know what and how to check.)

>>>
>>> It is not enabled by default. There is a flag in the PMIC that needs to 
>>> be enabled. We've been playing with a driver to set the flag, but there are 
>>> other bugs in that driver not related to actually charging.
>>>  
>>>

 Also, it's not clear (without reading the data sheet :) ) about the 
 resistor values for the thermistor and the parallel (linearizing?) 
 resistor.

 If you have a 10K thermistor, do you put it in parallel with a 10K 
 resistor, or likewise 100K thermistor in parallel with a 100K resistor? Do 
 you put the thermistor anywhere in contact with the (e.g., 18650) LiPo?

>>>
>>> Looking at the TPS65217 datasheet says to put a 75kohm resistor in 
>>> parallel.
>>>
>>> I'm not sure, but I believe the actual thermal resistor should be 
>>> something like 
>>> https://www.ametherm.com/blog/thermistors/thermistors-ntc-thermistor-temperature-sensors-provide-li-ion-battery-safety/
>>> . 
>>>  
>>>

 From the prior thread, it seems to be sufficient (if even necessary) 
 just to connect a 10K resistor from TS (P2-16) to ground (P2-15).

>>>
>>> Yes, that is supposed to work, ignoring the battery temperature.
>>>  
>>>

 10uF cap from battery (P2-14) to ground (P2-15).

 (Tangent/future: What about larger cap, perhaps using a 5.5V supercap, 
 detect supercap discharging (lipo voltage to ~min input voltage on vbat) 
 and give an interrupt to shut the board down?)


 Thanks in advance for your help, and to the original thread authors!


 Other posts that I found:

 Safely power down the PocketBeagle supplied by a battery (no replies?):
 https://groups.google.com/d/msg/beagleboard/dDSD89DGzpU/j2WzZyA2CgAJ

>>>
>>> I threw in a reply.
>>>  
>>>


 Supplying two ICs from the PocketBeagle powered by a Lipo battery
 https://groups.google.com/d/msg/beagleboard/B7Zyf97hvzY/z8cOt0MHBwAJ

 I want to do some excessive self-telemetry, both internal and external. 
 I plan to scale the raw battery voltage by 1/11 with an op amp before 

Re: [beagleboard] Re: battery power for PocketBeagle?

[Fred Kerr]

I'll try again soon with my more stable circuit (*soldered), also with RX 
disconnected so I just get output from the Pocket Beagle and the only power 
input is from the battery circuit. 

(*Soldered, so no loose breadboard connections, better current carrying 
capacity, etc.)

What is a good way to share log files? Mine can get verbose! I could store 
it somewhere and post a link - suggestions welcomed! I have a lot of 
possibilities, but just let me know what works best for you.

On Tuesday, August 28, 2018 at 12:51:23 PM UTC-7, Fred Kerr wrote:
>
> Yes, it ran quite a lot longer on the 1F, but still hung.
>
> I wired this up (see pic) to be more stable than the breadboard mess I 
> had. The led on 1.8k resistor is gonna run a lot longer than I'll take at 
> lunch!!!
>
> Can I isolate RX and TX or...oh I just need TX from the beagle for 
> visibility!
>
> 1F 5.5v supercap (that battery was discharged to 3.96v). This one has more 
> charge. Also put a 1000uf electrolytic on the soldered version, "because".
>
> Fred Kerr (mobile)
>
> On Tue, Aug 28, 2018, 12:13 PM Jason Kridner  wrote:
>
>>
>>
>> On Monday, August 27, 2018 at 11:15:36 PM UTC-4, Fred Kerr wrote:
>>>
>>> Hello all,
>>>
>>> I'm being just a little bit careful here:
>>>
>>> I'm about to try this, but I will connect up the serial terminal first, 
>>> so I can see output and interact with the board. (Graceful shutdown!)
>>>
>>
>> Don't connect the power or RX (ie., serial cable to PocketBeagle) signals 
>> to avoid them interfering. Great thing to monitor.
>>  
>>
>>>
>>> I will test the serial connection first with just a micro USB charging 
>>> cable rather than USB to a computer. (Simplify!)
>>>
>>
>> Not sure what you are testing here. Are you just saying you'll power via 
>> the microUSB connection and not connect to a computer, just to see the 
>> behavior? You are monitoring with a serial connection?
>>  
>>
>>>
>>> It's my understanding that LiPo charging is disabled or not present in 
>>> the firmware. (I'll give you the "uname -a" and other info the next time I 
>>> fire it up. Just let me know what and how to check.)
>>>
>>
>> It is not enabled by default. There is a flag in the PMIC that needs to 
>> be enabled. We've been playing with a driver to set the flag, but there are 
>> other bugs in that driver not related to actually charging.
>>  
>>
>>>
>>> Also, it's not clear (without reading the data sheet :) ) about the 
>>> resistor values for the thermistor and the parallel (linearizing?) resistor.
>>>
>>> If you have a 10K thermistor, do you put it in parallel with a 10K 
>>> resistor, or likewise 100K thermistor in parallel with a 100K resistor? Do 
>>> you put the thermistor anywhere in contact with the (e.g., 18650) LiPo?
>>>
>>
>> Looking at the TPS65217 datasheet says to put a 75kohm resistor in 
>> parallel.
>>
>> I'm not sure, but I believe the actual thermal resistor should be 
>> something like 
>> https://www.ametherm.com/blog/thermistors/thermistors-ntc-thermistor-temperature-sensors-provide-li-ion-battery-safety/
>> . 
>>  
>>
>>>
>>> From the prior thread, it seems to be sufficient (if even necessary) 
>>> just to connect a 10K resistor from TS (P2-16) to ground (P2-15).
>>>
>>
>> Yes, that is supposed to work, ignoring the battery temperature.
>>  
>>
>>>
>>> 10uF cap from battery (P2-14) to ground (P2-15).
>>>
>>> (Tangent/future: What about larger cap, perhaps using a 5.5V supercap, 
>>> detect supercap discharging (lipo voltage to ~min input voltage on vbat) 
>>> and give an interrupt to shut the board down?)
>>>
>>>
>>> Thanks in advance for your help, and to the original thread authors!
>>>
>>>
>>> Other posts that I found:
>>>
>>> Safely power down the PocketBeagle supplied by a battery (no replies?):
>>> https://groups.google.com/d/msg/beagleboard/dDSD89DGzpU/j2WzZyA2CgAJ
>>>
>>
>> I threw in a reply.
>>  
>>
>>>
>>>
>>> Supplying two ICs from the PocketBeagle powered by a Lipo battery
>>> https://groups.google.com/d/msg/beagleboard/B7Zyf97hvzY/z8cOt0MHBwAJ
>>>
>>> I want to do some excessive self-telemetry, both internal and external. 
>>> I plan to scale the raw battery voltage by 1/11 with an op amp before 
>>> feeding to one of the 1.8V ADC inputs. I'll defer to suggestions about 
>>> measuring current.
>>>
>>> (This is a tangent: I also plan to be paranoid if I connect to a car and 
>>> want to monitor the car's "12V" with something like a VCO on the car side 
>>> pulsing to an optoisolator, but I'm sure there are better ideas out there! 
>>> :) (I could use several PIC -> nrf24l01 for some "really good" isolation!)
>>>
>>> Thanks,
>>> Fred Kerr
>>>
>>> On Friday, November 10, 2017 at 10:32:46 AM UTC-8, Adam Saenz wrote:

 Keep in mind that the 7V is Absolute Max voltage so you should operate 
 below this level or risk damaging the chip.



 On Thursday, November 9, 2017 at 10:15:05 PM UTC-8, Shannon Mackey 
 wrote:
>
>
> I expect I'm overlooking something, But 

[beagleboard] Re: battery power for PocketBeagle?

[Jason Kridner]

On Monday, August 27, 2018 at 11:15:36 PM UTC-4, Fred Kerr wrote:
>
> Hello all,
>
> I'm being just a little bit careful here:
>
> I'm about to try this, but I will connect up the serial terminal first, so 
> I can see output and interact with the board. (Graceful shutdown!)
>

Don't connect the power or RX (ie., serial cable to PocketBeagle) signals 
to avoid them interfering. Great thing to monitor.
 

>
> I will test the serial connection first with just a micro USB charging 
> cable rather than USB to a computer. (Simplify!)
>

Not sure what you are testing here. Are you just saying you'll power via 
the microUSB connection and not connect to a computer, just to see the 
behavior? You are monitoring with a serial connection?
 

>
> It's my understanding that LiPo charging is disabled or not present in the 
> firmware. (I'll give you the "uname -a" and other info the next time I fire 
> it up. Just let me know what and how to check.)
>

It is not enabled by default. There is a flag in the PMIC that needs to be 
enabled. We've been playing with a driver to set the flag, but there are 
other bugs in that driver not related to actually charging.
 

>
> Also, it's not clear (without reading the data sheet :) ) about the 
> resistor values for the thermistor and the parallel (linearizing?) resistor.
>
> If you have a 10K thermistor, do you put it in parallel with a 10K 
> resistor, or likewise 100K thermistor in parallel with a 100K resistor? Do 
> you put the thermistor anywhere in contact with the (e.g., 18650) LiPo?
>

Looking at the TPS65217 datasheet says to put a 75kohm resistor in parallel.

I'm not sure, but I believe the actual thermal resistor should be something 
like 
https://www.ametherm.com/blog/thermistors/thermistors-ntc-thermistor-temperature-sensors-provide-li-ion-battery-safety/.
 
 

>
> From the prior thread, it seems to be sufficient (if even necessary) just 
> to connect a 10K resistor from TS (P2-16) to ground (P2-15).
>

Yes, that is supposed to work, ignoring the battery temperature.
 

>
> 10uF cap from battery (P2-14) to ground (P2-15).
>
> (Tangent/future: What about larger cap, perhaps using a 5.5V supercap, 
> detect supercap discharging (lipo voltage to ~min input voltage on vbat) 
> and give an interrupt to shut the board down?)
>
>
> Thanks in advance for your help, and to the original thread authors!
>
>
> Other posts that I found:
>
> Safely power down the PocketBeagle supplied by a battery (no replies?):
> https://groups.google.com/d/msg/beagleboard/dDSD89DGzpU/j2WzZyA2CgAJ
>

I threw in a reply.
 

>
>
> Supplying two ICs from the PocketBeagle powered by a Lipo battery
> https://groups.google.com/d/msg/beagleboard/B7Zyf97hvzY/z8cOt0MHBwAJ
>
> I want to do some excessive self-telemetry, both internal and external. I 
> plan to scale the raw battery voltage by 1/11 with an op amp before feeding 
> to one of the 1.8V ADC inputs. I'll defer to suggestions about measuring 
> current.
>
> (This is a tangent: I also plan to be paranoid if I connect to a car and 
> want to monitor the car's "12V" with something like a VCO on the car side 
> pulsing to an optoisolator, but I'm sure there are better ideas out there! 
> :) (I could use several PIC -> nrf24l01 for some "really good" isolation!)
>
> Thanks,
> Fred Kerr
>
> On Friday, November 10, 2017 at 10:32:46 AM UTC-8, Adam Saenz wrote:
>>
>> Keep in mind that the 7V is Absolute Max voltage so you should operate 
>> below this level or risk damaging the chip.
>>
>>
>>
>> On Thursday, November 9, 2017 at 10:15:05 PM UTC-8, Shannon Mackey wrote:
>>>
>>>
>>> I expect I'm overlooking something, But it isn't obvious to me how to 
>>> power the PocketBeagle with batteries.  It doesn't have a similar 
>>> arrangement to BBB.  Can someone point me in the right direction, please?  
>>> Thanks!
>>>
>>>

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Re: [beagleboard] Re: battery power for PocketBeagle?

[Shannon Mackey]

"1F 5.5v supercap helps"
Curious, Fred, how long does it run on that supercap?  more than a "few
lines on the serial console?"



On Tue, Aug 28, 2018 at 1:41 PM, Fred Kerr  wrote:

> 1F 5.5v supercap helps.
> I'll solder up the circuit with better current-carrying capacity.
> Maybe I'll set up one of my other pocket beagles with scaled op-amp inputs
> with 4051 and op amp. :) Some day?
>
> On Tuesday, August 28, 2018 at 10:22:44 AM UTC-7, Fred Kerr wrote:
>>
>> Maybe I need more than 10uf. It runs just long enough for only a few
>> lines on the serial console.
>
> --
> For more options, visit http://beagleboard.org/discuss
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> .
>
> For more options, visit https://groups.google.com/d/optout.
>

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[beagleboard] Re: battery power for PocketBeagle?

[Fred Kerr]

1F 5.5v supercap helps.
I'll solder up the circuit with better current-carrying capacity.
Maybe I'll set up one of my other pocket beagles with scaled op-amp inputs 
with 4051 and op amp. :) Some day?

On Tuesday, August 28, 2018 at 10:22:44 AM UTC-7, Fred Kerr wrote:
>
> Maybe I need more than 10uf. It runs just long enough for only a few lines 
> on the serial console.

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[beagleboard] Re: battery power for PocketBeagle?

[Fred Kerr]

Maybe I need more than 10uf. It runs just long enough for only a few lines on 
the serial console.

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[beagleboard] Re: battery power for PocketBeagle?

[Fred Kerr]

Hello all,

I'm being just a little bit careful here:

I'm about to try this, but I will connect up the serial terminal first, so 
I can see output and interact with the board. (Graceful shutdown!)

I will test the serial connection first with just a micro USB charging 
cable rather than USB to a computer. (Simplify!)

It's my understanding that LiPo charging is disabled or not present in the 
firmware. (I'll give you the "uname -a" and other info the next time I fire 
it up. Just let me know what and how to check.)

Also, it's not clear (without reading the data sheet :) ) about the 
resistor values for the thermistor and the parallel (linearizing?) resistor.

If you have a 10K thermistor, do you put it in parallel with a 10K 
resistor, or likewise 100K thermistor in parallel with a 100K resistor? Do 
you put the thermistor anywhere in contact with the (e.g., 18650) LiPo?

>From the prior thread, it seems to be sufficient (if even necessary) just 
to connect a 10K resistor from TS (P2-16) to ground (P2-15).

10uF cap from battery (P2-14) to ground (P2-15).

(Tangent/future: What about larger cap, perhaps using a 5.5V supercap, 
detect supercap discharging (lipo voltage to ~min input voltage on vbat) 
and give an interrupt to shut the board down?)


Thanks in advance for your help, and to the original thread authors!


Other posts that I found:

Safely power down the PocketBeagle supplied by a battery (no replies?):
https://groups.google.com/d/msg/beagleboard/dDSD89DGzpU/j2WzZyA2CgAJ

Supplying two ICs from the PocketBeagle powered by a Lipo battery
https://groups.google.com/d/msg/beagleboard/B7Zyf97hvzY/z8cOt0MHBwAJ

I want to do some excessive self-telemetry, both internal and external. I 
plan to scale the raw battery voltage by 1/11 with an op amp before feeding 
to one of the 1.8V ADC inputs. I'll defer to suggestions about measuring 
current.

(This is a tangent: I also plan to be paranoid if I connect to a car and 
want to monitor the car's "12V" with something like a VCO on the car side 
pulsing to an optoisolator, but I'm sure there are better ideas out there! 
:) (I could use several PIC -> nrf24l01 for some "really good" isolation!)

Thanks,
Fred Kerr

On Friday, November 10, 2017 at 10:32:46 AM UTC-8, Adam Saenz wrote:
>
> Keep in mind that the 7V is Absolute Max voltage so you should operate 
> below this level or risk damaging the chip.
>
>
>
> On Thursday, November 9, 2017 at 10:15:05 PM UTC-8, Shannon Mackey wrote:
>>
>>
>> I expect I'm overlooking something, But it isn't obvious to me how to 
>> power the PocketBeagle with batteries.  It doesn't have a similar 
>> arrangement to BBB.  Can someone point me in the right direction, please?  
>> Thanks!
>>
>>

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[beagleboard] Re: battery power for PocketBeagle?

[wm . bain . jr]

Adam --

This data sheet will be very useful. Thanks for sharing it!

Sincerely, 
-- Will 

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[beagleboard] Re: battery power for PocketBeagle?

[Adam Saenz]

Here is the link to data sheet: 
 http://www.ti.com/lit/ds/symlink/tps65217.pdf

Remember that this TI power management IC is integrated into the Octavo 
Systems part so that is why the data sheet is from TI.

Adam

On Friday, November 10, 2017 at 11:33:41 AM UTC-8, wi...@geomonkey.com 
wrote:
>
> Adam --
>
> Great, thanks for the info!
>
> BTW, would you provide a link to the data sheet?
>
> -- Will
>
>
> On Friday, November 10, 2017 at 10:53:51 AM UTC-7, Adam Saenz wrote:
>>
>> Pin 14 is the positive input for a single cell lithium (lion/lipo) 
>> battery.  Data sheet lists max input of 7V so you could use other battery 
>> combinations/chemistries if you like, but the internal circuitry will 
>> protect based on a single cell lithium.
>>
>> Pin 16 is for a temperature sensor used for battery charging.  From the 
>> data sheet:
>> Temperature sense input. Connect to NTC thermistor to sense battery 
>> temperature. Works with 10k and 100k thermistors.  
>>
>>
>> 
>>
>> I attached a snapshot showing the battery charge/temp sense circuit.
>>
>>
>> On Friday, November 10, 2017 at 8:54:53 AM UTC-8, Graham wrote:
>>>
>>> P2 pins 14 and 16 ?
>>>
>>> --
>>>
>>> On Friday, November 10, 2017 at 12:15:05 AM UTC-6, Shannon Mackey wrote:


 I expect I'm overlooking something, But it isn't obvious to me how to 
 power the PocketBeagle with batteries.  It doesn't have a similar 
 arrangement to BBB.  Can someone point me in the right direction, please?  
 Thanks!



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[beagleboard] Re: battery power for PocketBeagle?

[will]

Adam --

Great, thanks for the info!

BTW, would you provide a link to the data sheet?

-- Will


On Friday, November 10, 2017 at 10:53:51 AM UTC-7, Adam Saenz wrote:
>
> Pin 14 is the positive input for a single cell lithium (lion/lipo) 
> battery.  Data sheet lists max input of 7V so you could use other battery 
> combinations/chemistries if you like, but the internal circuitry will 
> protect based on a single cell lithium.
>
> Pin 16 is for a temperature sensor used for battery charging.  From the 
> data sheet:
> Temperature sense input. Connect to NTC thermistor to sense battery 
> temperature. Works with 10k and 100k thermistors.  
>
>
> 
>
> I attached a snapshot showing the battery charge/temp sense circuit.
>
>
> On Friday, November 10, 2017 at 8:54:53 AM UTC-8, Graham wrote:
>>
>> P2 pins 14 and 16 ?
>>
>> --
>>
>> On Friday, November 10, 2017 at 12:15:05 AM UTC-6, Shannon Mackey wrote:
>>>
>>>
>>> I expect I'm overlooking something, But it isn't obvious to me how to 
>>> power the PocketBeagle with batteries.  It doesn't have a similar 
>>> arrangement to BBB.  Can someone point me in the right direction, please?  
>>> Thanks!
>>>
>>>

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[beagleboard] Re: battery power for PocketBeagle?

[Adam Saenz]

Keep in mind that the 7V is Absolute Max voltage so you should operate 
below this level or risk damaging the chip.



On Thursday, November 9, 2017 at 10:15:05 PM UTC-8, Shannon Mackey wrote:
>
>
> I expect I'm overlooking something, But it isn't obvious to me how to 
> power the PocketBeagle with batteries.  It doesn't have a similar 
> arrangement to BBB.  Can someone point me in the right direction, please?  
> Thanks!
>
>

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Re: [beagleboard] Re: battery power for PocketBeagle?

[Shannon Mackey]

  Thank you very much!  The voltage limit was a concern. - Shannon   From: ajsa...@gmail.comSent: November 10, 2017 12:54 PMTo: beagleboard@googlegroups.comReply-to: beagleboard@googlegroups.comSubject: [beagleboard] Re: battery power for PocketBeagle?  Pin 14 is the positive input for a single cell lithium (lion/lipo) battery.  Data sheet lists max input of 7V so you could use other battery combinations/chemistries if you like, but the internal circuitry will protect based on a single cell lithium.Pin 16 is for a temperature sensor used for battery charging.  From the data sheet:
		
	
	
		Temperature sense input. Connect to NTC thermistor to sense battery temperature.
Works with 10k and 100k thermistors.  I attached a snapshot showing the battery charge/temp sense circuit.On Friday, November 10, 2017 at 8:54:53 AM UTC-8, Graham wrote:P2 pins 14 and 16 ?--On Friday, November 10, 2017 at 12:15:05 AM UTC-6, Shannon Mackey wrote:I expect I'm overlooking something, But it isn't obvious to me how to power the PocketBeagle with batteries.  It doesn't have a similar arrangement to BBB.  Can someone point me in the right direction, please?  Thanks!



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[beagleboard] Re: battery power for PocketBeagle?

[Adam Saenz]

Pin 14 is the positive input for a single cell lithium (lion/lipo) battery. 
 Data sheet lists max input of 7V so you could use other battery 
combinations/chemistries if you like, but the internal circuitry will 
protect based on a single cell lithium.

Pin 16 is for a temperature sensor used for battery charging.  From the 
data sheet:
Temperature sense input. Connect to NTC thermistor to sense battery 
temperature. Works with 10k and 100k thermistors.  



I attached a snapshot showing the battery charge/temp sense circuit.


On Friday, November 10, 2017 at 8:54:53 AM UTC-8, Graham wrote:
>
> P2 pins 14 and 16 ?
>
> --
>
> On Friday, November 10, 2017 at 12:15:05 AM UTC-6, Shannon Mackey wrote:
>>
>>
>> I expect I'm overlooking something, But it isn't obvious to me how to 
>> power the PocketBeagle with batteries.  It doesn't have a similar 
>> arrangement to BBB.  Can someone point me in the right direction, please?  
>> Thanks!
>>
>>

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[beagleboard] Re: battery power for PocketBeagle?

[Graham]

P2 pins 14 and 16 ?

--

On Friday, November 10, 2017 at 12:15:05 AM UTC-6, Shannon Mackey wrote:
>
>
> I expect I'm overlooking something, But it isn't obvious to me how to 
> power the PocketBeagle with batteries.  It doesn't have a similar 
> arrangement to BBB.  Can someone point me in the right direction, please?  
> Thanks!
>
>

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[beagleboard] Re: battery power for PocketBeagle?

[will]

I, too, am interested to know this. Wondering what the nominal and max. 
voltages are for SYS VIN and BAT VIN. Also, what sort of temperature sensor 
gets hooked up to BAT TEMP.
-- Will

On Thursday, November 9, 2017 at 11:15:05 PM UTC-7, Shannon Mackey wrote:
>
>
> I expect I'm overlooking something, But it isn't obvious to me how to 
> power the PocketBeagle with batteries.  It doesn't have a similar 
> arrangement to BBB.  Can someone point me in the right direction, please?  
> Thanks!
>
>

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