Help need in Arduino coding : Arduino with HC05

[Geethesh]

Plese help me to make a Arduino program to make the led blink continuously, when the hc-05 bluetooth module get disconnected from mobile.

[salmanfaris]

Hi @Geethesh , Since HC05 is Interfaced with Serial (UART), you can check whether it connected or not in the Serial.available() function call.

if (Serial.available() > 0) { // Checks whether data is comming from the serial port
  data = Serial.read(); // Reads the data from the serial port
}
else {
  // Write what you need if serial is not connected 
}

full Implementation .

#define led 13

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

void loop()
{
  if (Serial.available() > 0) { // Checks whether data is comming from the serial port
    data = Serial.read(); // Reads the data from the serial port
  }
  else {
    ledBlink();
  }
}



void ledBlink()
{
  digitalWrite(led, HIGH);
  delay(100);
  digitalWrite(led, LOW);
  delay(100);
}

All the best .