JY-MCU Bluetooth Module Interfacing With Arduino and Android App ...

                       Hi everyone, In this project i will show you how to control LED light with your Android device along with Arduino. I am using  bluetooth module for arduino to communicate with the android device.
To make this prototype I am using:

1. Arduino Uno
2. JY-MCU Bluetooth module
3. 2pcs 10k ohm Resistor
4. One Red LED
5. Breadboard
6. Jumper wire
7. And a Smart Phone app "Arduino Bluetooth " you will find it HERE

 
Arduino Code 


#include <SoftwareSerial.h>

int bluetoothTx = 2; // TX-O pin of bluetooth mate, Arduino D2 int bluetoothRx = 3; // RX-I pin of bluetooth mate, Arduino D3 int led = 12; int buttonPin1 = 7; int buttonPin2 = 8; int button1State = 0; int button2State = 0; int dataFromBt; boolean lightBlink = false; SoftwareSerial bluetooth(bluetoothTx, bluetoothRx); void setup() {  Serial.begin(9600); // Begin the serial monitor at 9600bps  bluetooth.begin(115200); // The Bluetooth Mate defaults to 115200bps  bluetooth.print("$"); // Print three times individually  bluetooth.print("$");  bluetooth.print("$"); // Enter command mode  delay(100); // Short delay, wait for the Mate to send back CMD  bluetooth.println("U,9600,N"); // Temporarily Change the baudrate to 9600, no parity  // 115200 can be too fast at times for NewSoftSerial to relay the data reliably  bluetooth.begin(9600); // Start bluetooth serial at 9600  pinMode(led, OUTPUT);  pinMode(buttonPin1, INPUT);  pinMode(buttonPin2, INPUT); } void loop() {  if(bluetooth.available()) // If the bluetooth sent any characters  {  // Send any characters the bluetooth prints to the serial monitor  //Serial.println((char)bluetooth.read());  dataFromBt = bluetooth.read();  if(dataFromBt == '1'){  Serial.println("led on");  digitalWrite(led, HIGH);  bluetooth.print("1");  }  if(dataFromBt == '0'){  Serial.println("led off");  digitalWrite(led, LOW);  bluetooth.print("0");  }  if(dataFromBt == 'b'){  Serial.println("a");  lightBlink = true;  }else{  lightBlink = false;  }  }  if(Serial.available()) // If stuff was typed in the serial monitor  {  // Send any characters the Serial monitor prints to the bluetooth  bluetooth.print((char)Serial.read());  }  // and loop forever and ever!  if(lightBlink){  digitalWrite(led, HIGH);  bluetooth.print("1");  Serial.println("HIGH");  delay(500);  digitalWrite(led, LOW);  bluetooth.print("0");  Serial.println("LOW");  delay(500);  }

  }

Source : www.circuitmagic.com