Both are connected to the same power outlet. And why is the other BBB not reacting when changing the state? It always stays at 1 (3.3V) even if I switch it off via command line...
Am Dienstag, 9. Dezember 2014 20:25:56 UTC+1 schrieb Gerald: > > Sounds like you have a grounding issue with your scope. Make sure the > power and scope are connected to the same power outlet that the scope probe > ground is connected to the board ground. > > Gerald > > > On Tue, Dec 9, 2014 at 11:39 AM, Maxi Miller <[email protected] > <javascript:>> wrote: > >> Hi, >> I am running two BBBs via power adapter, and I wanted to test the GPIO >> pins. One of them runs still on the manufacturing OS, the other one is >> up-to-date. Now I wanted to see the GPIO pin values with an oscilloscope. >> While trying to switch the pins on and off on the up-to-date-board via echo >> on/off > <pin> I experienced that the pin I wanted to switch never changed >> state. Therefore I tried to do the same on the other board, thinking that >> it was a software fault. But there I only measured a 50Hz-triangular >> signal, regardless which pin I chose (Even on GND and 5V). Why? What can I >> do to bring both of them back to work? >> Thanks! >> >> -- >> 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 [email protected] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Gerald > > [email protected] <javascript:> > http://beagleboard.org/ > http://circuitco.com/support/ > -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
