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/* Turn an LED on/off based on a command send via BlueTooth
**
** Credit: The following example was used as a reference
** Rui Santos: http://randomnerdtutorials.wordpress.com
*/
int ledPin = 13; // use the built in LED on pin 13 of the Uno
int state = 0;
int flag = 0; // make sure that you return the state only once
void setup() {
// sets the pins as outputs:
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);
Serial.begin(9600); // Default connection rate for my BT module
}
void loop() {
//if some data is sent, read it and save it in the state variable
if(Serial.available() > 0){
state = Serial.read();
flag=0;
}
// if the state is 0 the led will turn off
if (state == '0') {
digitalWrite(ledPin, LOW);
if(flag == 0){
Serial.println("LED: off");
flag = 1;
}
}
// if the state is 1 the led will turn on
else if (state == '1') {
digitalWrite(ledPin, HIGH);
if(flag == 0){
Serial.println("LED: on");
flag = 1;
}
}
}