I have a raspberry pi with a camera module that i want to take pictures of a shelf whenever something is placed onto it. I was going to use an arduino board with some strain gauges and a HX711 amplifier. is there a way to send a signal to the raspberry pi from the arduino when it senses there is something placed onto the shelf and then use that signal to then automatically take a picture?
For the Arduino , you Could just use a digital output connected to a pi input.
The voltage levels for the pi are lower so you will need a potential divider on that output to get the Arduino voltage down to 3.3v.
basically the pi needs to be a certain distance away from the shelf so that it can take a picture of the whole thing so i wanted to make it so that it could receive a signal wirelessly from the arduino that would be on the shelf, i've attached a rough sketch to kind of show what i mean
