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: 10549

Tags: Arduino, Control, Module, Relay, Serial, Tutorial:, of

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

Hello - all up to us the information, programs and projects is a wonderful grandfather and wholesome

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

Hi - I'm the designer who designed the masterpiece known Arduino google drive  my drive  Works like a Joker, a paper multiple areas is really wonderful and thank you for the designer

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

Printed board

Comment

You need to be a member of GarageLab (arduino, electronics, robotics, hacking) to add comments!

Join GarageLab (arduino, electronics, robotics, hacking)

Latest Activity

saad ali ahmed replied to saad ali ahmed's discussion help
"MATLAB"
3 hours ago
saad ali ahmed posted a discussion

help

after installation i getWarning: Unsuccessful read: A timeout occurred before theTerminator was…See More
3 hours ago
Butterfly Themes is now a member of GarageLab (arduino, electronics, robotics, hacking)
19 hours ago
Javier updated their profile
23 hours ago
awet kidane posted a discussion
yesterday
GarageLab posted blog posts
yesterday
Profile IconCJay, Circuit Buck and Pablo Orellana S joined GarageLab (arduino, electronics, robotics, hacking)
Thursday
GarageLab posted blog posts
Wednesday
Mr Abraham Akim is now a member of GarageLab (arduino, electronics, robotics, hacking)
Tuesday
GarageLab posted a blog post

Drop runs through maze alone

A alcohol's drops seems to have gained life - or at least behave as if they know what they are…See More
Monday
Profile IconFrank H., KHUSHBOO AGARWAL, Christopher LaFave and 1 more joined GarageLab (arduino, electronics, robotics, hacking)
Monday
GarageLab posted a blog post
Jan 22
awet kidane commented on GarageLab's blog post Tutorial: Using GPS Shield as an Anti-Theft Device
"how can i simulate gps  in proteus "
Jan 21
GarageLab posted blog posts
Jan 21
Profile Iconawet kidane, Ken Cofer and Burula Oleg joined GarageLab (arduino, electronics, robotics, hacking)
Jan 21
GarageLab posted blog posts
Jan 19
Colin Green updated their profile
Jan 19
Profile Iconjack, soe, Colin Green and 1 more joined GarageLab (arduino, electronics, robotics, hacking)
Jan 19
Mafaz commented on Thulana Vimukthi's blog post GPS GUIDED AUTONOMOUS ROBOT
"Dear sir , I am doing a project on "Design and Development of Human Following Robot" . In…"
Jan 18
Shannon Bradley replied to Shannon Bradley's discussion Nikola Tesla
"http://www.edisontechcenter.org/tesladebunked.html Thank you Jilt, I'm not sure why my…"
Jan 16

© 2015   Created by Marcelo Rodrigues.

Badges  |  Report an Issue  |  Terms of Service