Bluetooth Home Automation

PIN OUT
Device---------------------- Arduino pin12
Bluetooth module Tx --- Arduino pin Rx
Bluetooth module Rx --- Arduino pin Tx
Bluetooth module VCC-- 5v Arduino (OUTPUT)
Bluetooth module GND--GND Arduino (OUTPUT)


-------Arduino Code--------

int Device = 12;

String readString;

void setup() {
Serial.begin(9600);
pinMode(Device, OUTPUT);
}

void loop() {
while (Serial.available()) {
delay(3);
char c = Serial.read();
readString += c;
}
if (readString.length() >0) {
Serial.println(readString);
if (readString == "on")
{
digitalWrite(Device, HIGH);
}
if (readString == "off")
{
digitalWrite(Device, LOW);
}

readString="";
}
}


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