How to Use 2 Channel Relay Module Using Arduino

In the previous article, I already discussed about the Relay Module. The Relay Module that I used in the article is the 1 Channel Relay Module.

In this article I will discuss the relay module again. The relay module that I used is different from the previous module. This time I will use the 2 channel relay module.

this is a feature of the relay module that I will use:

• 2 Channel Relay
• Optocoupler LOW Level Triger
• Led relay indicator
• Relay Maximum output : 10A/250 VAC, 10A/30 VDC.
• Optocoupler isolation

Components needed for this tutorial:

• 2 Channel 5V Relay Module
• Arduino Nano V3
• Jumper Wire
• USBmini

See the instructions below to connect the Relay Module with Arduino

Relay Modul to Arduino

GND ==> GND
IN1 ==> D12

IN2 ==> D11

VCC ==> +5V

To control the Relay Module, we don't need to use "Library".

Take a look at the sketch I made for more clarity.

#define Relay1 12
#define Relay2 11
void setup() {
  pinMode(Relay1, OUTPUT);
  pinMode(Relay2, OUTPUT);
}
void loop() {
digitalWrite(Relay1, HIGH);
digitalWrite(Relay2, LOW);
delay(3000);
digitalWrite(Relay2, HIGH);
digitalWrite(Relay1, LOW);
delay(3000);
}

What happens to the relay module after I enter the program?

The thing that happens is, the relay module will live alternately. When relay1 is off, relay2 is on, and vice versa.