Arduino Relay Module Circuit Diagram. A relay can be used to control high voltage electronic devices such as motors and as well as low voltage electronic devices such as a light. As you can see it contains two pc817c based optocouplers.
The electromagnet requires a small voltage to get activated which we will give from the arduino and once it is activated it will pull the contact to make the high voltage circuit. An ac bulb is used for demonstration. Relay module for arduino is one of the most powerful application for arduino as it can be used to control both a c and d c devices by simply controlling the relay by giving 5v.
The following picture shows the internal circuit diagram of the 5v dual channel relay module.
Learn how to use relay with arduino how relay works how to connect relay to arduino how to code for relay how to program arduino step by step. Controlling a relay module with the arduino is as simple as controlling any other output as we ll see later on. I have explained this smart relay module circuit in the tutorial video of this home automation project. Introducing the relay module.
