Tutorial: Arduino Serial Control of Relay Module

On this tutorial, we will show how to use Arduino or any compatible board (Garagino in this case) to control a Relay Module using Serial communication with the PC.

Attention: You must be very careful while using relay modules connected to AC power plug. Please be careful to avoid electrical shock!

Material List:

  • 1 x Arduino or compatible board (AVR board)
  • 1 x USB/Serial Converter
  • 1 x Relay Module
  • 1 x Lamp. 127V with cable and plugs.
  • 1 x Breadboard
  • Jumpers

 

1º Cut one of the wires of AC cable. Connect one side to the C (Common) and connect the other to NO (Normally Open) from Relay Modulo (Picture 1).

Picture 1

2º Connect USB/Serial Converter 5V pin to Vcc bus on the breadboard (Prefer red jumpers);

3º Connect USB/Serial Converter GND pin to GND bus GND on the breadboard (Prefer black jumpers).

4º Connect the coupling capacitor (100nF between the USB/Serial Conversor pin DTR and the reset on the AVR board).

5º Connect breadboard Vcc bus to: AVR board Vcc, USB/Serial module CTS and Vcc pins (Prefer Red jumpers).

6º Now connect the following pins to breadboard GND: AVR board GND and Relay Module GND (Prefer Black jumpers).

7º Connect USB/Serial TX pin to AVR board RX Pin (Blue jumper on Picture 2).

8º Connect USB/Serial RX pin to AVR board TX Pin (Orange jumper on Picture 2).

Picture 2

9º For the last step, connect Relay Module input IN to Arduino's D8 pin or the correspondent on AVR board (Garagino in this case). Green Connection on Picture 3.

Picture 3

Verify all connections. Link an USB cable between PC and USB/Serial Converter and AC plug on power.

Copy and paste this Sketch in the Arduino's IDE:

char serialin;

#define relay 8
void setup() {

  //Begin Serial Comunication(configured for 9600baud)
  Serial.begin(9600);
  //pin relay as OUTPUT
  pinMode(relay, OUTPUT);
  //Relay
  digitalWrite(relay,LOW);
  }

void loop() {
  //Verify connection by serial
  while (Serial.available() > 0) {
    //Read Serial data and alocate on serialin
    serialin = Serial.read();
    //If serialin is equal as 'o' or 'O' LAMP OFF
    if (serialin == 'o' || serialin =='O'){ // Two Pipeines(||) to make a boolean OR Comparission
      digitalWrite(relay,LOW);
      }
    /*serialin is equal as 'c' or C */
    else if (serialin == 'c' || serialin =='C'){ // Two Pipeines(||) to make a boolean OR Comparission
      digitalWrite(relay,HIGH);
      }
      Serial.println(serialin);
  }
}

Configure Serial Monitor to 9600 Baud. Send by Serial Monitor letter ”c” or “C” and press Enter. The relay will be close (Lamp ON). Now send “o” or “O” and it will be open(Lamp OFF).

Thanks for following this tutorial! If you have any question, please comment.

Views: 21578

Comment by نهاد عبدالله حسين السلمان on January 17, 2013 at 12:56am

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Comment by نهاد عبدالله حسين السلمان on January 17, 2013 at 1:18am

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Comment by نهاد عبدالله حسين السلمان on January 17, 2013 at 1:20am

Printed board

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