Practical Programming

Arduino Controller using smart phone

Circuit Diagram:

Arduino Source Code

const int redLed=12;

const int greenLed=11;

int state = 0;

//String s;

void setup() {

 pinMode(redLed, OUTPUT);

 pinMode(greenLed, OUTPUT);

 digitalWrite(redLed, LOW);

 digitalWrite(greenLed, LOW);

 Serial.begin(9600); // Default communication rate of the Bluetooth module

}

void loop() {

  

 if(Serial.available() > 0){ // Checks whether data is comming from the serial port

 state = Serial.read(); // Reads the data from the serial port

 if (state==0)

   digitalWrite(redLed, LOW);

 else if (state==1)

   digitalWrite(redLed, HIGH);

 if (state==2)

   digitalWrite(greenLed, LOW);

 else if (state==3)

   digitalWrite(greenLed, HIGH); 

 Serial.println(state); // Send back, to the phone, the String "LED: ON"

 }

}

Download Smartphone App