home_automation_using_using_arduino_rx.c

/*
   created by prasant
   www.electronify.org
   you can do what ever you want with this piece of code
*/

#include <LiquidCrystal.h>`
LiquidCrystal lcd(10, 9, 8, 7, 6, 5);
int incomingByte = 0;   // for incoming serial data
const int relayPin1 = 13;      // the number of the relay pin
const int relayPin2 = 12 ;
const int relayPin3 = 11;
void setup() 
{
          pinMode(relayPin1, OUTPUT);   
          pinMode(relayPin2,OUTPUT);
          pinMode(relayPin3,OUTPUT);  
          Serial.begin(9600);     // opens serial port, sets data rate to 9600 bps
          lcd.begin (20, 4);
          lcd.clear ();
          lcd.setCursor (0, 0);
          lcd.print ("WWW.ELECTRONIFY.ORG");
}

void loop() {

        // send data only when you receive data:
        if (Serial.available() > 0) {
                // read the incoming byte:
                incomingByte = Serial.read();
                if(incomingByte==1)
                {
                  lcd.setCursor (0, 1);
                  lcd.print("LAMP1 IS ON ");
                  digitalWrite(relayPin1, HIGH);
                }
                else if(incomingByte==2)
                {
                  lcd.setCursor (0, 1);
                  lcd.print("FAN IS ON ");
                  digitalWrite(relayPin2, HIGH);
                } 
                else if (incomingByte==3)
                {
                  lcd.setCursor (0, 1);
                  lcd.print("LAMP2 IS ON ");
                  digitalWrite(relayPin3, HIGH);
                }
                else
                {
                  lcd.setCursor (0, 1);
                  lcd.print("press button ");
                  digitalWrite(relayPin1, LOW);
                  digitalWrite(relayPin2, LOW);
                  digitalWrite(relayPin3, LOW);
                }
        }
}