3

I am working with three Raspberry Pi 3 B boards, which in turns have RPi camera modules V2 connected to each. I followed this very detailed post about triggering another Pi using GPIO pins and it works exactly as stated. I am able to trigger the camera on the second Pi by setting output pin 18 to High.

My pins are connected as follows:

  • Pin 25 of Pi 1 is connected to the switch (5V)
  • Pin 18 or Pi 1 is connected to pin 23 of itself and pin 23 of Pi2.
  • Two Pi's have their grounds connected.

Configured as such, I have the camera module on Pi 2 take pictures, not two together. If the second Pi pin 23 is disconnected, Pi 1 takes pictures.

I tried to see whether voltages on pins 23 are not sufficient, but they are so unstable, I cannot measure them properly with a voltmeter.

1
  • 2
    Never connect a Pi GPIO to more than 3V3.
    – joan
    Nov 6, 2017 at 22:20

0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.