[beagleboard] Re: Can I use GPIO pin that is not provide PWM mode for PWM?

[Adam Saenz]

A couple of options to consider; neither are perfect solutions but could 
work ok based on your application:

1) Toggle a GPIO with software, there will be 1-2KHz of jitter and you 
can't guarantee that that will be the maximum jitter you ever see.

2) If the extra PWM signal can be an exact copy of an existing hardware 
based PWM, you could use an ISR to toggle another GPIO anytime the hardware 
PWM transitions.


On Thursday, January 18, 2018 at 4:37:46 AM UTC-8, parunre...@hotmail.com 
wrote:
>
> Can I use GPIO pin that is not provide PWM mode for PWM?
>
> Due to BBB doesn't have enough PWM pins to use, so can I use GPIO pin that 
> is not provide PWM mode for PWM?
>
> I want to use GPIO pin with IGBT gate drive (TIDA-00446) that require PWM 
> input.
>

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Re: [beagleboard] Re: Use analogue inputs with 5 or 10 V signal

[Adam Saenz]

That circuit will work.  Yes on connecting external ground to GNDA, that
will give you a common reference.  Those resistor values will allow the ADC
to see about 1.78V when the input voltage is 5V, looks like a good place to
start.  As far as resistor values (1k, 1.8k vs 10k, 18k), I'd go with the
1k, 1.8k pair as long as your source circuit can handle sourcing a 2.8k
load (1.7mA max).  If it can't then I'd consider something that gives you a
total resistance of 5-6k.  The 10k/18k pair gives you 28k total, should be
ok but I've had ADCs have trouble working when resistances approach 100k.

Someone mentioned using op amps which is a good choice, as is using an
anti-aliasing filter but since this is a noob type question I figured
starting simpler is a better choice.  You can improve you analog circuit if
you discover your application needs to minimize noise, or is sensitive to
load, etc.  Start simple though.

Adam

On Tue, Dec 26, 2017 at 10:58 AM, Dennis Lee Bieber 
wrote:

> On Tue, 26 Dec 2017 10:40:54 -0800 (PST),
> mike.maikae...@gmail.com declaimed the
> following:
>
> >
> >
> >So it could look like this!? External ground is directly connected to GNDA
> >and the relation between the resistors is equal to the relation of the
> >voltages to apply at each!? How about the exact resistor values - 18 kOhm
> >and 10 kOhm would be the same from relation, but which one should I use
> >really? Thanks :-)
> >
>
> How much current flow can you accept? Consider, without the
> resistors
> you basically have a direct short from the input voltage source to ground.
> Small value resistors will let a lot more current pass. You likely need to
> balance between not having too much current flowing through the divider and
> having so little current flowing that the ADC can't sense the voltage...
>
> --
> Wulfraed Dennis Lee Bieber AF6VN
> wlfr...@ix.netcom.comHTTP://wlfraed.home.netcom.com/
>
> --
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[beagleboard] Re: Use analogue inputs with 5 or 10 V signal

[Adam Saenz]

Forgot to add that you should use the GNDA as the ground reference to your 
external analog input sources.

Adam

On Wednesday, December 20, 2017 at 6:57:26 AM UTC-8, Adam Saenz wrote:
>
> You will need to use a voltage divider to lower the detectable voltage of 
> your 0-5V or 0-10V inputs to a range of 0-1.8V or less.  Google voltage 
> divider to see how this is done; sparkfun provides a pretty nice 
> explanation of voltage dividers.  If you look at the schematic, an example 
> of a voltage divider is done for AIN7 to read the 3.3V supply voltage.  
> AIN7 will see is 1.65V when VDD_3V3B is 3.3V.
>
> ADCs are most accurate when the voltage they are reading is stable and 
> free from noise or ripple voltages.  Digital circuits (e.g. the processor 
> cor) are sources of digital noise so a separate VADC and GNDA are provided 
> to minimize the influence of noisy digital sources.   If you look on the 
> schematic VDD_ADC is actually connected to VDD_1V8 through a ferrite bead 
> (inductor). The ferrite bead is there to block high frequency noise caused 
> by the digital circuits, while allowing DC voltages to pass; so VDD_ADC is 
> actually connected to 1.8V.  The AM3358 datasheet lists the max voltage 
> input of VDD_ADC as 2.1V so you cannot connect a 5V or 10V reference 
> directly to it.  It's best to use the existing 1.8V reference and scale the 
> analog input voltages you want to measure so they are less than 1.8V.
>
> Adam
>
>
> On Wednesday, December 20, 2017 at 4:46:11 AM UTC-8, mike.ma...@gmail.com 
> wrote:
>>
>> Hi,
>>
>> this is somewhat a noob-question, but my skills in analogue hardware are 
>> limited.
>>
>> The BeagleBones (and variants) come with six analogue inputs which each 
>> have a separate ground line GNDA and also a separate power supply VADC.
>>
>> My questions here: how can I connect an external signal with 0..5V or 
>> 0..10V to these inputs in order to read their analogue value?
>>
>> And how about GNDA, has it to be separated from normal GND?
>>
>> Thanks!
>>
>> Mike
>>
>>

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[beagleboard] Re: Use analogue inputs with 5 or 10 V signal

[Adam Saenz]

You will need to use a voltage divider to lower the detectable voltage of 
your 0-5V or 0-10V inputs to a range of 0-1.8V or less.  Google voltage 
divider to see how this is done; sparkfun provides a pretty nice 
explanation of voltage dividers.  If you look at the schematic, an example 
of a voltage divider is done for AIN7 to read the 3.3V supply voltage.  
AIN7 will see is 1.65V when VDD_3V3B is 3.3V.

ADCs are most accurate when the voltage they are reading is stable and free 
from noise or ripple voltages.  Digital circuits (e.g. the processor cor) 
are sources of digital noise so a separate VADC and GNDA are provided to 
minimize the influence of noisy digital sources.   If you look on the 
schematic VDD_ADC is actually connected to VDD_1V8 through a ferrite bead 
(inductor). The ferrite bead is there to block high frequency noise caused 
by the digital circuits, while allowing DC voltages to pass; so VDD_ADC is 
actually connected to 1.8V.  The AM3358 datasheet lists the max voltage 
input of VDD_ADC as 2.1V so you cannot connect a 5V or 10V reference 
directly to it.  It's best to use the existing 1.8V reference and scale the 
analog input voltages you want to measure so they are less than 1.8V.

Adam


On Wednesday, December 20, 2017 at 4:46:11 AM UTC-8, mike.ma...@gmail.com 
wrote:
>
> Hi,
>
> this is somewhat a noob-question, but my skills in analogue hardware are 
> limited.
>
> The BeagleBones (and variants) come with six analogue inputs which each 
> have a separate ground line GNDA and also a separate power supply VADC.
>
> My questions here: how can I connect an external signal with 0..5V or 
> 0..10V to these inputs in order to read their analogue value?
>
> And how about GNDA, has it to be separated from normal GND?
>
> Thanks!
>
> Mike
>
>

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[beagleboard] Re: Powering the BeagleBone Blue?

[Adam Saenz]

I believe the GPS UART port could be used.  PWM subsystem 0 would need to 
be configured for use similar to subsystems 1 and 2 which are used for on 
board drivers.



On Thursday, October 19, 2017 at 9:40:37 PM UTC-7, Unlisted wrote:
>
> I see there's a connector labeled LIPO and In looking at the specs for the 
> Beagle Bone Blue it states that this is for
>
> "2 cell (2S) LiPo battery connector " 
>
> ( Short-Spec 
> 
>  
> and Schematic 
> 
>  
> ) 
>
> Does that mean that in that connector, only 2 Cell LiPo batteries are 
> supposed to be used? 
>
> What about wanting to have a battery operated robot with longer-lived 
> batteries and more power draw (e.g. motors)? Does that mean you need to 
> power the BBBlue via the barrel input and if so - then is it recommended 
> that you also have a 2 Cell LiPo battery connected to the LIPO connector?
>

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[beagleboard] Re: Possible for Beaglebone Blue to support a non-wireless Ethernet connection?

[Adam Saenz]

You can also get a Robotics Cape for your BBB and it will give you all the 
features of the BBBlue except for the WiFi.  You'll then maintain your 
Ethernet interface.

By the way, the BBBlue uses a PRU for the 4th encoder.  It may be possible 
to use the Robotics Cape software without a Robotics Cape and use the 
appropriate pins on the BBB headers for the 4 channels of encoder (3 
hardware, 1 PRU).  You'll just need to do some level shifting if your 
encoders are higher than 3.3V logic.





On Thursday, November 16, 2017 at 3:11:39 PM UTC-8, n feehan wrote:
>
> Hi, I'm looking at buying the Beaglebone Blue, after prototyping with the 
> Beaglebone Black. I'm making this change because my application needs 
> hardware support for four quadrature encoders and not three.
>
> However, my application streams this encoder data as fast as possible over 
> UDP as an OSC message - when I use a wireless connection anywhere in my OSC 
> path, I see the data rate reduce drastically, to the point where it's not 
> suitable for my application.
>
> My questions are:
> * Does the Beaglebone Green support four quadrature encoder channels?
> * Is there a way to get wired Ethernet (ie, cat5 cable) out of the 
> Beaglebone Blue?
>
> Thanks for any help / info you may be able to provide!
>
> AKA
>

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[beagleboard] Re: Is there a BeagleBone Black IMU cape?

[Adam Saenz]

The Robotics Cape has an IMU on it along with a bunch of other robotic 
related features.

https://www.renaissancerobotics.com/RoboticsCape.html




On Tuesday, November 14, 2017 at 3:16:45 PM UTC-8, Kyle wrote:
>
> Does anyone know of a beaglebone cape with IMU capabilities that is still 
> in production? I have found plenty that seem to be end-of-life.
>

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[beagleboard] Re: PWM from BeagleBone Blue to external motor controller.

[Adam Saenz]

Hi Phil,

Q1)  I would suggest looking at rc_pwm.c which is in the 
Robotics_Cape_Installer source code.  A comment in the code says that there 
are 3 PWM subsystems; subsystem (ss) 1 and 2 are used by the built in motor 
drivers but ss 0 can be accessed from UART1; which leads one to believe is 
the the UART for GPS based on the comment from the PinMux online manual. 
 But the online manual for RoboticsCape says that UART2 (not UART1) is for 
GPS so either the code comment is old/wrong or the documentation is wrong. 
 Looks like a bit of experimenting is required to figure out which UART 
port is the correct one, but my guess would be that UART2 is the correct 
one.  You can then look at rc_motors.c to see how the pwm functions are 
used to configure the pwm subsystem and set duty cycle and frequency.  All 
this should be done after a call to the PinMux API to configure the pins 
for PWM. 

Q2)  What is your level of comfort with electronics modifications?  Then 
motor PWM signals are not mapped directly to a connector but you could 
access them via a hardware hack.  Remove the built in motor driver chips 
and solder in wires to the appropriate pads.  You could also try soldering 
directly to the appropriate built in motor driver pins as well.  In either 
case your soldered in wires should be hot glued or RTV'd in place to 
provide some strain relief.  It's a total hardware hack but it would allow 
you to used the robotics cape software as is.  This is assuming your new 
motor driver also uses 2 extra pins to control direction and braking (CW, 
CCW, short-brake, and stop) same as the TB6612FNG chip.  If it does not 
they you'll have to use the GP0 or GP1 IO pins to provide that 
functionality as your new motor driver needs.  Honestly this approach may 
be better suited for the BBBlack as all required I/O is mapped directly to 
and the header pins; but then you would loose all the other built in 
features of the BBBlue/Robotics cape.

If it were me I would go with the first approach and configure GPS UART2 
for PWM output.  Let me know if you have any question with this approach 
and I can look at the code a bit closer.

Adam




On Sunday, November 12, 2017 at 8:31:03 PM UTC-8, Phillip Glau wrote:
>
> I'm trying to build a differential drive robot using some 6v motors with 
> encoders from Pololu. Their amperage exceeds the capabilities of the built 
> in motor controllers on the BB Blue.
>
> I've got a larger separate motor controller that will accept PWM signal 
> for control.
>
> Question 1: Which physical connector on the BeagleBone Blue do I connect 
> to in order to access 2 channels of PWM? I'm not clear how PinMux 
>  works as described in the 
> manual. I'm assuming it means that once I figure out which physical 
> connector to attach to, that I can then change the functionality to PWM. 
> (Seems like perhaps the GPS connector is the correct one??) Unfortunately 
> the online manual doesn't seem to give practical example code of this 
> functionality.
>
> Question 2: Is it possible to access the PWM signal of the built in motor 
> controllers? This would be ideal as then the external motor controller 
> would be functionally transparent to the roboticscape software that 
> already exists. Again, I can't figure out if this is possible or which 
> connectors to tie into to access the PWM signal that drives Motor Channels 
> 1 to 4
>
> Thanks in advance for any help you can provide.
>
> - Phil
>

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[beagleboard] Re: Connecting two Beaglebone Blacks

[Adam Saenz]

I'm assuming you are not taking the cost of the Beaglebones themselves into 
consideration as the 2 would be them most expensive parts of this project.  
Here are three ways of connecting 2 BBB together there are tradeoffs with 
each approach.

1) (not expensive, not the simplest) Connect the 2 boards via a UART 
channel; this will provide point to point communication between the two.  
Your software on each will have to handle all the communication details and 
functionality to receive commands and send files over UART.  There is 
probably code out there to do some of this but you have to integrate it 
together for your application.  Once cable between the two boards and you 
still have your ethernet port available for external connection.  This is 
my least favorite option. 

2) (Simple, not least expensive) Connect the two with a cheap ethernet 
switch.  This allows you to use built in command line functions to control 
and copy files (ssh, scp).  You can get a pretty inexpensive 5 port switch, 
which will maintain the ability to communicate to both BBBs.  TP-Link 
5-Port Fast Ethernet Unmanaged Switch | Plug and Play | Desktop (TL-SF1005D) 

 or Brash Networks 5-Port 10/100 Mbps Full Duplex Desktop Unmanaged Fast 
Ethernet Switch BN-FE105 

 are 
a couple of ethernet switches that are under $10.  You could remove the 
boards from their enclosure if it makes it easier to repackage.  While not 
the least expensive it's really not that expensive either.

3) (Simple, not expensive) You could also connect both with an ethernet 
crossover cable. This would eliminate the need of a switch at the expense 
of losing the ability to connect to them externally via ethernet.  You do 
have the USB ports to connect to them I suppose.  This would allow you to 
use ssh/scp while eliminating the cost of the switch; simple to connect, 
inexpensive to implement. Buhbo 1 ft CAT5e Crossover Cable UTP, Gray Wire 
with Green Boot 


Adam

On Friday, November 10, 2017 at 7:30:35 AM UTC-8, M Pitman wrote:
>
> I have a need to connect two Beaglebone Blacks together.  One will act as 
> a desktop computer that will send commands to the second one.  The second 
> Beaglebone will process the command, create a file and send that file back 
> to the first Beaglebone.  The two Beaglebones will be in one container and 
> may or may not be connected to a separate computer.
>
> Does anyone know a simple and inexpensive way to accomplish this?
>
> Thanks,
>
> Mike Pitman
>

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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.  
>>
>>
>> <https://lh3.googleusercontent.com/-CK_LopJaVd8/WgXnbydvnjI/A-c/xGMvXDsla98khgCiSTgLYdnBHnA5Qb6UwCLcBGAs/s1600/Screen%2BShot%2B2017-11-10%2Bat%2B9.52.10%2BAM.png>
>>
>> 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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[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: USB Not Working

[Adam Saenz]

Ok, bought a pack of new cables and I now have USB network and mass 
storage.  I was using a cable that came with some Bluetooth headsets.  It 
charges the headsets fine, but I guess the data lines don't work or are not 
even present.  Thanks again for the help.



On Wednesday, October 25, 2017 at 6:03:21 PM UTC-7, Adam Saenz wrote:
>
> I have not!  It's the simple stuff that escapes us!  I'll buy a new cable 
> and report back on the results.  Thanks for the suggestion.
>
> Adam
>
> On Wednesday, October 25, 2017 at 5:47:50 AM UTC-7, Unlisted wrote:
>>
>> * Have you tried a different USB cable? 
>>  
>> * Can you boot the Win7 PC with an Ubuntu LiveCD 
>> <https://help.ubuntu.com/community/LiveCD> (or LiveUSB) and try it from 
>> the Ubuntu OS? 
>>
>> On Tuesday, October 24, 2017 at 10:11:59 PM UTC-5, Adam Saenz wrote:
>>>
>>> I am not able to see the Beagle Bone Blue as a mass storage device or 
>>> USB Network; I've tried it on a Win7 PC and a Mac with OSX Sierra.  I 
>>> followed the "Getting Started" guide; installed the latest image (Debian 
>>> 9.2 2017-10-10 4GB SD IoT) from https://beagleboard.org/latest-images 
>>> and loaded the indicated drivers.
>>>
>>> Any advice on what I should try next?  I'd like to have USB Network 
>>> available as a backup to WiFi.
>>>
>>> Thanks,
>>>
>>> Adam 
>>>
>>>

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[beagleboard] Re: USB Not Working

[Adam Saenz]

I have not!  It's the simple stuff that escapes us!  I'll buy a new cable 
and report back on the results.  Thanks for the suggestion.

Adam

On Wednesday, October 25, 2017 at 5:47:50 AM UTC-7, Unlisted wrote:
>
> * Have you tried a different USB cable? 
>  
> * Can you boot the Win7 PC with an Ubuntu LiveCD 
> <https://help.ubuntu.com/community/LiveCD> (or LiveUSB) and try it from 
> the Ubuntu OS? 
>
> On Tuesday, October 24, 2017 at 10:11:59 PM UTC-5, Adam Saenz wrote:
>>
>> I am not able to see the Beagle Bone Blue as a mass storage device or USB 
>> Network; I've tried it on a Win7 PC and a Mac with OSX Sierra.  I followed 
>> the "Getting Started" guide; installed the latest image (Debian 9.2 
>> 2017-10-10 4GB SD IoT) from https://beagleboard.org/latest-images and 
>> loaded the indicated drivers.
>>
>> Any advice on what I should try next?  I'd like to have USB Network 
>> available as a backup to WiFi.
>>
>> Thanks,
>>
>> Adam 
>>
>>

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[beagleboard] USB Not Working

[Adam Saenz]

I am not able to see the Beagle Bone Blue as a mass storage device or USB 
Network; I've tried it on a Win7 PC and a Mac with OSX Sierra.  I followed 
the "Getting Started" guide; installed the latest image (Debian 9.2 
2017-10-10 4GB SD IoT) from https://beagleboard.org/latest-images and 
loaded the indicated drivers.

Any advice on what I should try next?  I'd like to have USB Network 
available as a backup to WiFi.

Thanks,

Adam 

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