2 Relay Module Interfacing with Arduino

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2 Relay Module Interfacing with Arduino

1. Relay Proteus Simulation

• I have also designed relay simulation in Proteus ISIS.
• Relay Proteus ISIS simulation is shown in the figure given below.

2. 2 Relay Module  Components

• A complete list of the components used while designing 2 relay module is shown in the figure given below.

3. 2 Relay Module  Input Pins

• 2 relay module has five (5) input pins in total, each perform different action.
•  All of its pins are provided in the table shown in the figure below.

4. 2 Relay Module  Input Pins Description

• We must know about the functions of each pin.
• 2 relay board/module input pin functions are listed in the table shown in the figure below.

• Both IN1 and IN2 comes from the micro-controller (Arduino UNO in this case).
• IN1 pin controls the 1st relay attached on 2 relay module.
• IN2 pin controls the 2nd relay attached on 2 relay module

5. 2 Relay Module  Output Pins

• 2 relay module has three (3) output pins for each relay.
• Its output pins are given in the table shown in the figure given below.

6. 2 Relay Module  Output Pins Description

• Each output pin of 2 relay module has its own functions.
• 2 relay module pin functions are listed in the table given in the figure shown below.

• NO pin is normally open pin and device attached to this pin will not work if the relay is not energized.
• COM is a common pin i.e. ground pin.
• NC is normally closed pin and device attached to this pin will start working even if the relay is not energized.

7. 2 Relay Module  Compatibility

• 2 relay module is compatible with different micro-controllers.
• Some of those micro-controllers are provided in the table shown in the figure given below.

8. 2 Relay Module  Circuit Diagram

• Circuit diagram of 2 relay module is given in the figure shown below.

9. 2 Relay Module  Interfacing with Arduino Wiring Diagrams

• First you should have a look at Relay Interfacing With Microcontroller using ULN2003A, you will get a better idea about its interfacing with different micro-controllers.
• Wiring diagram for 2 relay module interfacing with Arduino is shown in the figure given below.

10. 2 Relay Module  Interfacing with Arduino Actual Diagrams

• I have provided the complete wiring diagram for 2 relay module interfacing with Arduino.
• Wiring diagram is shown in the figure given below.

11. 2 Relay Module  Interfacing with Arduino Source Code & Description

• If you are new to Arduino software then you must have a look at How to write Arduino code.
• You just need to copy and paste the source code given below in your Arduino software.
• The complete source code for 2 relay module interfacing with Arduino is given below.

int relay1 = 6;
int relay2 = 7;  

void setup() {
  
  pinMode(relay1, OUTPUT); 
  pinMode(relay2, OUTPUT);
}

void loop() {

   digitalWrite(relay1,LOW);
   delay(1000);
 
   digitalWrite(relay1,HIGH); 
   delay(1000);
   
   digitalWrite(relay2,LOW); 
   delay(1000);
   
   digitalWrite(relay2,HIGH); 
   delay(1000);
}

• First of all I have defined relay pins.
• Then I have changed the mode of these pins to output.
• After that I have turned on and off both of the relays with the delay of 1 sec or 1000 msec.
• So, that was the brief description about the source code for 2 relay module interfacing with Arduino.
• You can download the wiring diagram and complete Arduino source code here by clicking on the button below.

12. 2 Relay Module  Features

• The most common features associated with 2 relay module are provided in the table shown in the figure given below.

13. 2 Relay Module  Application

• 2 relay module applications are given in the table shown in the figure below.