I have 2 raspberry PIs 1x PI3 and 1x PIZero with camera attached. I want to set up a system to have a output GPIO pin on the PI3 and a input pin on the pizero connect so that when I set the PI3 pin to HIGH, I can read it with the PIZero pin via interrupt and know when to take a picture.
Has anyone tried something similar or know if this would work well? I am testing at the moment and might be getting some false reading (need to do more testing). Using RPi.GPIO Library.
Most examples I've seen connected input GPIO to GND or 3.3v instead of another GPIO pin.
Edit: Would this also work for 1x pi3 to 4x pizero i.e. would 1 output pin on pi3 supply enough power that all 4 pizero can read it as input.
<------> zero1 input pin pi3 output pin <------> zero2 input pin <------> zero3 input pin <------> zero4 input pin