I have search hundreds of website, I watched many videos, but I cannot understand how to make raspberry pi talk to Photon, where it could read a sensors or turn led on or off, etc...)
I managed to use the Particle app to turn the d7 led on/off.
I cannot find a way to make the raspberry pi talk to Photon. Some websites say I need to use the protocol i2c. but to use it a need to connect the RPI to the Photon with wire. which doesn't make any sense.
Please give me a light...