Arduino and Relay module Interfacing

Interfacing Arduino with 5V Relay /

 Controlling High Voltage Device with Arduino 

Circuit

Code in Action:

See also:

Interfacing I2C LCD with Arduino

Arduino Development Platform

Code:

#include <Wire.h> 

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

// defines relayPin

const int relayPin = 2;

// defines variables

void setup() {

  lcd.init();    // initialize the lcd 

  lcd.backlight();  // lcd backlight ON

  lcd.setCursor(0,0);  // 0 row, 0 column

  pinMode(relayPin, OUTPUT); // Sets the relayPin as an Output

}

void loop() {

  lcd.clear();

  // Clears the trigPin

  digitalWrite(relayPin, HIGH);

  lcd.clear();

  lcd.print("Relay OFF");

  delay(1000);

  digitalWrite(relayPin, LOW);

  lcd.clear();

  lcd.print("Relay ON");

  delay(1000);

}