Hi all,
I was doing some testing yesterday and discovered that the I/O pins on the RPi come up with interesting voltages on powerup.
I had just assumed that they would all come up at ground state, but we measured several pins and found them at 0.7, 1.2, 1.7, and 2.7 volts output.
We were trying to debug a driver circuit I designed, but noticed the default was at 1.2 volts and thought we might have a defective board. So we installed a brand new RPi 3 and found the pins at the above stated levels.
I am VERY disappointed in the RPi designers for not defaulting the pins to ground state until they are accessed by software.
Hopefully, they will correct this oversight in the next version.
Having random output levels could really do some damage to external circuits wired into an RPi.
DAB
