Arduino Program upload while BTooth module connected avrdude: stk500_getsync(): not in sync: resp=0x45

Question

I'm trying to use arduino with Bluetooth module (HC-06). And also im trying to send/receive data from android with the app (ArduDroid which is in playstore).

But i have the problem while sending program to Arduino uno after successful compilation. The error Code is when vcc connected to 3.3V

avrdude: stk500_getsync(): not in sync: resp=0x00

When i connected to 5V sometimes error code changes to but usually same as 3.3v

avrdude: stk500_getsync(): not in sync: resp=0x45.

When i unplug the bt device sending program is successful but i cant receive or send anything. I checked com port and board. Everything is OK. Please help me to continue my licence project. Best regards..

The code is as below:

int ledPin = 13; 
int state = 0;
int flag = 0; 

void setup() {
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);

  Serial.begin(9600); // Default connection rate for my BT module
}

void loop() {

  if(Serial.available() > 0){
    state = Serial.read();
    flag=0;
  }

  if (state == '0') {
    digitalWrite(ledPin, LOW);
    if(flag == 0){
      Serial.println("LED: off");
      flag = 1;
    }
  }

  else if (state == '1') {
    digitalWrite(ledPin, HIGH);
    if(flag == 0){
      Serial.println("LED: on");
      flag = 1;
    }
  }
}

ladislas ladislas · Accepted Answer · 2014-11-27T17:28:16

You need to unplug the module before uploading the code via USB.

the module uses the same serial pins than the ones used for USB serial, that's where your issue comes from.

uploading code via bt is tricky. it can be done but I've never succeeded myself... :(

Arduino Program upload while BTooth module connected avrdude: stk500_getsync(): not in sync: resp=0x45

2 Answers