The microcontroller development board can be used as modules, can be used as device control 5V - 12V control signal from TTL DC or AC control signals can control the 220V AC load there is a normally open contact normally open and open Useful for controlling a motor, a led strip or any other module using arduino. How to use it: Simply connect a digital output from your arduino to your relay module and you can control a device requiring energy with the digital signal provided by your arduino.
