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: 11709

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

Profile IconOleg and Scott Runner joined GarageLab (arduino, electronics, robotics, hacking)
12 hours ago
GarageLab posted a blog post

Birdly Uses the Oculus Rift So That You Can Be the Bird

Mankind has always dreamed about experiencing flight like the birds do. We’ve come a long way, but…See More
15 hours ago
GarageLab left a comment for RMullen
"Hi RMullen! I'd like to let you know that FRANK KWABENA is no longer a member of…"
yesterday
daniel gabriel updated their profile
yesterday
daniel gabriel left a comment for daniel gabriel
"Good Day Mr. Wabena, i dont see any interesting on my profile but i really appreciated that you…"
yesterday
RMullen replied to Lauren Elizabeth's discussion Scammed...?
"Yes there is another one sending out the same message now.  This is the message I got: FRANK…"
yesterday
Rick Lin is now a member of GarageLab (arduino, electronics, robotics, hacking)
yesterday
GarageLab posted a blog post
Tuesday
Profile IconCalvin M and harsha joined GarageLab (arduino, electronics, robotics, hacking)
Tuesday
GarageLab posted a blog post

These Colorful Liquid Droplets Chase Each Other Like Living Organisms

Scientists at Stanford University were at first perplexed by the strange behavior they observed…See More
Monday
GarageLab posted blog posts
Mar 20
Profile IconJody Bowie, Kevin Kvarda, Tony Stoklosa and 2 more joined GarageLab (arduino, electronics, robotics, hacking)
Mar 19
Sergey commented on GarageLab's blog post Tutorial: How to use the Monster Moto Shield
"Good day. Can you help me? I took this sketch, but it doesn't working( "
Mar 19
Profile IconDonald Soji Adedokun, Ankur Deo and Hannu Miettinen joined GarageLab (arduino, electronics, robotics, hacking)
Mar 18
GarageLab posted a blog post
Mar 18
GarageLab posted a blog post

Iron Man Delivers Kid’s Robotic Arm: Proof that Tony Stark Has a Heart

Alex Pring now has one heck of a story to tell his friends. Not only did the 7-year old meet Iron…See More
Mar 16
Profile IconJohn Murphy and Asma Ho joined GarageLab (arduino, electronics, robotics, hacking)
Mar 16
Electronicsrus is now a member of GarageLab (arduino, electronics, robotics, hacking)
Mar 13
AnalysIR commented on GarageLab's blog post Tutorial: Arduino IR sender and receiver
"@kkukkuk this problem has been discussed receltly on the Arduino forum - why not search there. You…"
Mar 13
kkukkuk commented on GarageLab's blog post Tutorial: Arduino IR sender and receiver
"hi..there are some errors in both irsend and irreceive coding.. ir sender: sketch_mar14a.ino:17:1:…"
Mar 13

© 2015   Created by Marcelo Rodrigues.

Badges  |  Report an Issue  |  Terms of Service