[beagleboard] Re: Burned out BBB with AIN0 > 1.8V
Any suggestions or part numbers are much appreciated! Please, if it's not to difficult, let me know which op-amps you've used. I've worked with the LM324 in the past for another project so I'm relatively comfortable with this one. Thanks again all! On Tuesday, June 7, 2016 at 1:33:40 AM UTC-7, Chris Green wrote: > > Harvey White > wrote: > > >3. What is the "normal" way of using the BBB analog inputs with 5V > levels? > > > Is it possible - or is there where I would use a level-shifter or > zener > > >diode? > > > > Level shifters are generally digital, and zener diodes don't help all > > that much (and are not really a good idea here). My standard advice > > would be to run the analog voltage through a non-inverting op amp > > configured as a gain stage. You run the op-amp (and have to pick one > > that does rail to rail and also runs from 1.8 volts) from the 1.8 volt > > supply. > > > Yes, that's what I do. There are quite a few very low power op-amps > suitable for running from the 1.8 volt rail on the BBB. If OP is > interested I can look up the device, it's from TI if I remember. > > -- > Chris Green > ยท > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/a9f1c150-cb9f-448d-bb6c-2951957aac8f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Burned out BBB with AIN0 > 1.8V
Thanks all! No doubt it was my fault - I'm not trying to blame anyone else, I was more curious about what I did to my board. =) I had a couple other BBB's around so I was a bit cavalier with the whole thing - lesson learned, haha. I really appreciate all the info, and will check all the suggested reading. Gerald - Assuming I just killed the AM335, would most of the other components on the board be okay, aside from possibly the Power Management chip? On Monday, June 6, 2016 at 10:12:43 AM UTC-7, Doyle S wrote: > > Hi, > > Yesterday I was trying to use some of the analog inputs on the BBB to read > my photodiode, and instead, I think I blew up the power supply on my board. > With power applied, I get no PWR led, so I'm pretty certain it's dead. > Short of replacing the power management chip, is there anything I can > do/replace to get the board working again? > > > Brief Background > > I hooked up the photodiode to an Arduino and was able to read 0 - 5V > easily, so I wanted to do the same on the BBB. > I read some of the materials re: AIN on the BBB, but apparently I missed > all the references to the max voltage of 1.8V! > I started by enabling the analog inputs on the BBB, and started with AIN0. > > With nothing attached, I was reading about 0 - so far, so good. > Then I figured I'd try to see what a full 5.0V read out, so I plugged in > the VDD 5V to AIN0, and all the LEDs went out instantly. > Now all LEDs stay off, even the PWR LED, when power is applied. > > No doubt, it was stupid, but I have a few additional takeaways - > 1. Very minor references in most BBB documentation/webpages discussing > Analog Inputs and max voltages. > Coming from working with Pi's and Arduino's, it was common to have analog > inputs range from 0 to 5V, so the 1.8V was unexpected. > > 2. Isn't there any protection at all from this kind of damage? Or was > the main problem that I used the VDD 5V and fed it into the AIN0 port? > Would I have killed it if I used the VDD ADC instead of the VDD 5v or > would using the VCC ADC possibly have protected it? > > 3. What is the "normal" way of using the BBB analog inputs with 5V > levels? Is it possible - or is there where I would use a level-shifter or > zener diode? > > Thanks for the any comments or additional info provided! > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/8b780479-5694-4cc5-8f60-17e9bdfd8ec5%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Burned out BBB with AIN0 > 1.8V
Hi, Yesterday I was trying to use some of the analog inputs on the BBB to read my photodiode, and instead, I think I blew up the power supply on my board. With power applied, I get no PWR led, so I'm pretty certain it's dead. Short of replacing the power management chip, is there anything I can do/replace to get the board working again? Brief Background I hooked up the photodiode to an Arduino and was able to read 0 - 5V easily, so I wanted to do the same on the BBB. I read some of the materials re: AIN on the BBB, but apparently I missed all the references to the max voltage of 1.8V! I started by enabling the analog inputs on the BBB, and started with AIN0. With nothing attached, I was reading about 0 - so far, so good. Then I figured I'd try to see what a full 5.0V read out, so I plugged in the VDD 5V to AIN0, and all the LEDs went out instantly. Now all LEDs stay off, even the PWR LED, when power is applied. No doubt, it was stupid, but I have a few additional takeaways - 1. Very minor references in most BBB documentation/webpages discussing Analog Inputs and max voltages. Coming from working with Pi's and Arduino's, it was common to have analog inputs range from 0 to 5V, so the 1.8V was unexpected. 2. Isn't there any protection at all from this kind of damage? Or was the main problem that I used the VDD 5V and fed it into the AIN0 port? Would I have killed it if I used the VDD ADC instead of the VDD 5v or would using the VCC ADC possibly have protected it? 3. What is the "normal" way of using the BBB analog inputs with 5V levels? Is it possible - or is there where I would use a level-shifter or zener diode? Thanks for the any comments or additional info provided! -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/3dd92ed6-0fc6-44fc-8b0f-2eca5d690390%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Newest Debian images from eLinux missing ntp and other packages
Thanks so much for the fast response! I'm helping my coworker out, so I had to ask him which images he used. But I did a bit of research and confirmed your comments back, and it all makes perfect sense now. =) We were using the "BBB-eMMC-flasher-debian-7.9-console-armhf-2015-11-03-2gb.img" image, which, as you pointed as, is a console release. Thanks for clarifying this - I totally understand and appreciate the need for a lightweight image, so I didn't mean to suggest these things *should* be added to the console release. Same goes for wireless-tools. With the above image, I confirmed the lack of sbin and wrong date on boot up, no biggie. I tried syncing the time, but I got command not found and didn't find it in sbin, but installing some version of ntp seems to resolve that. As for the issue we faced with DNS issues and issues updating the repo, it was the exact same issue in this post - https://groups.google.com/forum/#!category-topic/beagleboard/ubuntu/DjFqxreT1AA At the time, I had to hard code the IP for the missing repos (I think it was also the ports.ubuntu repo) and it worked. But I just tested this on a fresh flash and wasn't able to recreate the issue, so in my test case, everything worked great. I'll dig a bit more on this but I think this may have been a weird "freak" occurrence. Thanks again for your response and help, now back to my BBB! Have a good one, Robert On Wednesday, December 2, 2015 at 5:48:23 PM UTC-8, RobertCNelson wrote: > > On Wed, Dec 2, 2015 at 6:33 PM, > wrote: > > I have been working the BBB Rev B and C for over a year, and I've been > using > > the Debian images provided by eLinux and Beagleboard, available from - > > > > http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Debian_Releases > > > > and http://beagleboard.org/latest-images > > > > In the most recent builds from 2015-11-03, I've been having a lot of > trouble > > with missing system tools and packages. > > Some examples include - > > Please include the file name, there's dozen images... > > > - wrong date and time set due to ntp service not being installed, > installing > > ntp resolves this issue > > wheezy: ntpdate > jessie: systemd-timesync > > > - inability to connect using supported wifi adapter due to missing > > wireless-tools package > > your using the "console" image... > > > - missing DNS support which causes apt-get to fail as it is unable to > > correctly resolve the IP addresses for the rcn.ee repos included in the > > builds > > okay, this is od.. > > > > - missing /sbin directory in PATH, including missing ifconfig command, > > adding /sbin to path resolves these issues > > yeap, this is the "console" image, can't fix this as patch isn't > installed.. > > > Did I miss some announcement or release notes about these releases that > says > > they are lighter than previous builds? > > > > Why didn't I have most of these issues with previous builds? > > IIRC, all the builds I used before included ntp, /sbin in the PATH, and > DNS > > support, and wireless worked OOTB (after editing > /etc/network/interfaces) > > Based on that, it sounds like your using the "console" over the > "lxde/lxqt" image. The goal with the "console" image was to be as > small but yet "flash" the eMMC.. Not everyone likes to "apt-get > remove xyz" instead they want something very small, and wireless tools > are not on that requirement list.. > > Regards, > > -- > Robert Nelson > https://rcn-ee.com/ > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
