Since Arduinos can’t multitask (do more than one thing a time) it’s useful to connect two Arduinos together.
There are two Arduinos in this circuit. They are wired together. Each Arduino has its program installed.
There are two Arduinos in this circuit and program:
Arduino 1 – the Leader – has the button/input and triggers Arduino 2 – the Follower. The Leader can also have its own program to with outputs like LEDs, servos and sound.
Arduino 2 – the Follower – waits for the signal from the Leader Arduino. Once it receives that signal, the program on the Follower starts.
Follow the links below to find the programs for the Leader and the Follower.