I get about 1.2v when the BBB is powered on. This voltage is present on all GPIO pins!
As mentioned earlier when the pin is set to OUTPUT and LOW I get 1.2v. However, when I set it to HIGH I get 3.3v. Subsequently, after setting it to HIGH, when I set it back to LOW the voltage drops to zero! > On Jun 2, 2015, at 12:47 AM, Andrey Somov <[email protected]> wrote: > > If you connect a voltmeter what do you see ? > > Andrey > > >> On Monday, June 1, 2015 at 7:53:29 PM UTC+2, [email protected] wrote: >> I have been playing with the GPIO pins both through the OS as well as Python >> using the adafruit libraries, and I am seeing some strange behavior. When I >> connect an LED + 470 Ohm resistor to GND and a GPIO pin set as OUTPUT, I see >> the LED glow dimly (i.e there is a slight voltage present) even when the pin >> is set to LOW! When I set the pin to HIGH, however, I see the expected >> result (i.e the LED lights up normally). >> >> This behavior is seen with all GPIOs, and I am wondering if it is normal. >> Shouldn't the voltage across the GPIO pins and GND be zero when set to low? >> >> I have an Element 14 RevC. with the latest Debian installed. >> >> Any help/insight would be much appreciated. >> >> >> >> -- 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.
