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: 29744

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

Marcelo Rodrigues replied to GarageLab's discussion Serious claims against BeagleBone's manufacturer CircuitCo
"Ed, No, they didn't deliver yet.  :( Good luck for us all."
Thursday
Profile IconWesenachin Asfaw and Muhammad Basil joined GarageLab (arduino, electronics, robotics, hacking)
Thursday
Marcelo Rodrigues replied to FiniousFingers's discussion New to group
"Hey man! A good point to start is reading basic tutorials on Arduino coding and wiring. Then, you…"
Thursday
FiniousFingers posted a discussion

New to group

Couple quick things,I am just starting to learn, or wanting to learn, how to use the Arduino UNO…See More
Thursday
Profile IconDan Urbauer, Bjorn and Jiaming Zhao joined GarageLab (arduino, electronics, robotics, hacking)
Wednesday
FiniousFingers is now a member of GarageLab (arduino, electronics, robotics, hacking)
Monday
Erva updated their profile
Mar 16
Erva and Mrs. Priscilla Bonneval are now friends
Mar 16
Profile IconSamantha Dorr, Lee Robinson and Celso Eiju Ito joined GarageLab (arduino, electronics, robotics, hacking)
Mar 16
Edward Evans updated their profile
Mar 15
Edward Evans replied to GarageLab's discussion Serious claims against BeagleBone's manufacturer CircuitCo
"Hi Marcelo, I am curious if you have had any resolution on this?  We may be in the same boat…"
Mar 15
Celso Eiju Ito left a comment for Mrs. Priscilla Bonneval
"I just accept your invitation. Thank You for contact me. Sincerelly,   'Eiju"
Mar 15
Mohasin Ahamed Chinnapattan commented on Mauro Assis's blog post How to hack a remote control (and a flying shark) I
"You mentioned collector is set to ground but emitter is set to ground in your diagram "
Mar 14
Profile Iconbadrkhan mijbas khalifa, Bethany Cruz, Mrs. Priscilla Bonneval and 1 more joined GarageLab (arduino, electronics, robotics, hacking)
Mar 13
Edward Evans is now a member of GarageLab (arduino, electronics, robotics, hacking)
Mar 9
Profile IconAllan Zilkowsky, Shubham Dewangan, FAUSTO PEREIRA ROMANO and 4 more joined GarageLab (arduino, electronics, robotics, hacking)
Mar 1
Dave Lewing is now a member of GarageLab (arduino, electronics, robotics, hacking)
Feb 27
Profile Iconjames essien and Chow HP joined GarageLab (arduino, electronics, robotics, hacking)
Feb 17
Profile IconPerry Duvall, Irayya Mathad and wiley milam joined GarageLab (arduino, electronics, robotics, hacking)
Feb 16
Profile IconAlan Powell and Chuck Nolan joined GarageLab (arduino, electronics, robotics, hacking)
Feb 9

© 2017   Created by Marcelo Rodrigues.   Powered by

Badges  |  Report an Issue  |  Terms of Service