Help need in Arduino coding : Arduino with HC05



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



  • 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 .


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