Oh, and additionally. The circuit needs to be isolated when the board powers on / off. This is where my electronics knowledge will fail me, but if that pin is not isolated at boot, and it's externally powered. You may have damaged the pin . . . also you're powering your circuit from what looks like P9.5, which is 5V, the gpio pins are only 3v3 tolerant.
Additionally, the GPIO pins can only source / sink so much current, For many, this is only 6mA or less, where a few are 8mA. But again, my electronics knowledge would fail me here in knowing exactly what's going on with your circuit. On Mon, Oct 24, 2016 at 6:32 PM, William Hermans <yyrk...@gmail.com> wrote: > I'd check /sys/class/gpio/gpio49/direction . . . > > william@beaglebone:~$ cat /sys/class/gpio//gpio49/direction > in > > Make sure its "out" > > After that, I'd start by disconnecting P9.23 from the circuit, then check > with a volt meter that the pin isn't somehow damaged. P9.1 and P9.2 are > both ground on that header. > > On Mon, Oct 24, 2016 at 5:50 PM, mzimmers <mzimm...@gmail.com> wrote: > >> Hi, Przemek - >> >> It's a Fairchild BS270: >> >> link on newark >> <http://www.newark.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=15003&langId=-1&urlRequestType=Base&partNumber=33C9973&storeId=10194> >> >> I (obviously) need to learn more about this...is the information you ask >> of in the data sheet? If so, I'll search for it. >> >> mz >> >> On Monday, October 24, 2016 at 6:44:59 PM UTC-6, Przemek Klosowski wrote: >>> >>> On Mon, Oct 24, 2016 at 8:33 PM, mzimmers <mzim...@gmail.com> wrote: >>> >>> > 2. What do you mean by "reverse logic?" That I've miswired my >>> transistor? >>> > Here's my wiring: >>> > >>> > drain comes in from LED >>> > gate goes to P9, pin 23 (GPIO 49) >>> > source comes from GND >>> >>> A word of caution--some MOSFETs start conducting between source and >>> drain when you apply voltage to the the gate, and others work the >>> other way. Which one do you have---what's the type? >>> >> -- >> 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/ms >> gid/beagleboard/6b6a7013-43d2-45de-9913-3fe539533273%40googlegroups.com >> <https://groups.google.com/d/msgid/beagleboard/6b6a7013-43d2-45de-9913-3fe539533273%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> For more options, visit https://groups.google.com/d/optout. >> > > -- 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/CALHSORo3b8T%2B1Mu5ANwke8ca5ua1gLXbgGL4GR8uEbmecqBDpg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
