Hi. I want to create a control where I will send a signal from an Main Arduinocard to another Arduino card where the card triggers a relay, and sends a signal back to the Main Arduino board.
This will be done wirelessly. How can I make this radio controller?
I have an Arduino Dua ... board. I want it to be in contact (wireless) with a temperature sensor. The sensor provides a signal to a relay that pulls when determining need for heat.