Relay module 4 channel


Relay module 4 channel

A relay almost works like a switch, which can be electrically controlled. It can be turned on or off, letting the current go through or not, and can be controlled with low voltages, like the 5V provided by the Arduino pins. This relay module has two channels (those blue cubes). There are other models with one, four and eight channels. This module should be powered with 5V, which is appropriate to use with an Arduino. There are other relay modules that are powered using 3.3V, which is ideal for ESP32, ESP8266, and other microcontrollers.



A relay has 3 pins like a lot of other modules, namely:-
1. VCC
2. Ground
3. SIgnal
On the other side, it has a connector with 3 sockets,common (COM), normally closed (NC), and normally open (NO).


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