1,2V is called a "float". On power up all GPIO pins are set to inputs.
Gerald On Tue, Jun 2, 2015 at 8:33 AM, Ali Shahkar <[email protected]> wrote: > 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. > -- Gerald [email protected] http://beagleboard.org/ -- 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.
