SOURCE CODE

/*
 IoT Based Home Automation
*/

//libraries for LCD Display
#include <LiquidCrystal.h>
// Define LCD display pins
LiquidCrystal lcd(12,11,10,9,8,7);
const int Device1 = 6; // Relay pin 1 (IN1)
const int Device2 = 5; // Relay pin 2 (IN2)
const int Device3 = 4; // Relay pin 3 (IN3)
const int Device4 = 3; // Relay pin 4 (IN4)
void setup() 
{
 Serial.begin(9600); //Sets the baud for serial data transmission
 // Set Relay pins as OUTPUT 
 pinMode(Device1, OUTPUT);
 pinMode(Device2, OUTPUT);
 pinMode(Device3, OUTPUT);
 pinMode(Device4, OUTPUT);
 
 // Print massage on LCD Display 
 lcd.begin(16, 2); // LCD no. of columns and rows: 16*2
 lcd.setCursor(0,0); // Sets the cursor at 0th column and 0th row when LCD 
ON
 lcd.print(" IoT Based ");
 lcd.setCursor(0,1);
 lcd.print("Home Automation");
 delay(2000);
 // To Print message All devices are OFF when system is ON 
 lcd.clear();
 lcd.setCursor(0,0);
 lcd.print(" D1 D2 D3 D4 ");
 lcd.setCursor(0,1);
 lcd.print(" OFF OFF OFF OFF");
} 
void loop() 
{
 lcd.setCursor(0,0);
 lcd.print(" D1 D2 D3 D4 ");
 // Read data from Bluetooth Module
 if (Serial.available() > 0)
 { 
 char Val = Serial.read();
 // Print Bluetooth Module data on serial monitor
 Serial.print("VAL: ");
 Serial.println(Val);
 // When Bluetooth Module data "1" then Relay1 ON
 if (Val == '1')
 {
 digitalWrite(Device1,LOW);
 lcd.setCursor(1,1);
 lcd.print("ON ");
 delay(200);
 }
 // When Bluetooth Module data "A" then Relay1 OFF
 else if (Val=='A')
 {
 digitalWrite(Device1,HIGH);
 lcd.setCursor(1,1);
 lcd.print("OFF");
 delay(200);
 }
 // When Bluetooth Module data "2" then Relay2 ON
 else if (Val=='2')
 {
 digitalWrite(Device2,LOW);
 lcd.setCursor(5,1);
 lcd.print("ON ");
 delay(200);
 }
 // When Bluetooth Module data "B" then Relay2 OFF
 else if (Val=='B')
 {
 digitalWrite(Device2,HIGH);
 lcd.setCursor(5,1);
 lcd.print("OFF");
 delay(200);
 }
 // When Bluetooth Module data "3" then Relay3 ON 
 else if (Val=='3')
 {
 digitalWrite(Device3,LOW);
 lcd.setCursor(9,1);
 lcd.print("ON ");
 delay(200);
 }
 // When Bluetooth Module data "C" then Relay3 OFF 
 else if (Val=='C')
 {
 digitalWrite(Device3,HIGH);
 lcd.setCursor(9,1);
 lcd.print("OFF");
 delay(200);
 }
 // When Bluetooth Module data "4" then Relay4 ON 
 else if (Val=='4')
 {
 digitalWrite(Device4,LOW);
 lcd.setCursor(13,1);
 lcd.print("ON ");
 delay(200);
 }
 // When Bluetooth Module data "D" then Relay4 OFF 
 else if (Val=='D')
 {
 digitalWrite(Device4,HIGH);
 lcd.setCursor(13,1);
 lcd.print("OFF");
 delay(200);
 } 
 // When Bluetooth Module data "9" then All Relay ON 
 else if (Val=='9')
 { 
 digitalWrite(Device1, LOW);
 digitalWrite(Device2, LOW);
 digitalWrite(Device3, LOW);
 digitalWrite(Device4, LOW);
 lcd.setCursor(0,1);
 lcd.print(" ON ON ON ON ");
 delay(200);
 }
 // When Bluetooth Module data "I" then All Relay OFF 
 else if (Val=='I')
 {
 digitalWrite(Device1, HIGH);
 digitalWrite(Device2, HIGH);
 digitalWrite(Device3, HIGH);
 digitalWrite(Device4, HIGH);
 lcd.setCursor(0,1);
 lcd.print(" OFF OFF OFF OFF");
 delay(200);
 } 
 }
 }