I am using a GeeeTech voice recognition module, I have recorded my voices using CoolTerm, and imported these voice commands in my sketch. However, when I plug in that voice recognition module, an error gets thrown: avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00; otherwise, it uploads normally. How can the computer and the Arduino lose connection when the voice recognition module gets plugged in? This is the USB that I used to record my commandsThis is the Geetech voice recognition module I am using. I have checked my com ports, and checked the everything that it is connected to is correct.

#include <avr/sleep.h>
#include <avr/power.h>
//#include "math.h"
//This sketch is a metronome, in which each led pin shows one beat.
const int speaker = 13;//speaker at pin 13
int ts = 6;//highest led pin
int count = 3;//"beat 1 pin"
const int keyPin = 11;//button to change time signature
const int keyPinR = 10;//button to change rhythm
const int keySwitch = 2;//sleep mode/wake up button

//All pins below use a pull-up resistor, so the states are inverted
int buttonState = LOW;
int buttonState2 = LOW;
int switchState = LOW;
int silentState = LOW;

int bpm = 120;//you do not need to know this, 
//it's just a variable for the potentialmeter to change the tempo
int comdata;

int rthm = 1;//rhythm 
int pressed = 0;//
long silent = 0;

byte com = 0; //reply from voice module

void setup()

 for(int thisPin = 3;thisPin <= ts;thisPin++)
     pinMode(thisPin,OUTPUT); //initialize thisPin as an output
     pinMode(12, INPUT); //potentialmeter for changing tempo

   //Pin 9 to 11, along with pin 2, are all push buttons with pull-up resistors
    for(int i = 9; i<=11; i++)
      pinMode(i, INPUT);
      digitalWrite(i, HIGH);
    pinMode(2, INPUT);

//imported voice commands

 Serial.print("Type in beats per minute");


void loop()

void turnOn()
    buttonState = digitalRead(keyPin);//key for 
    buttonState2 = digitalRead(keyPinR);
    switchState = digitalRead(keySwitch);
    silentState = digitalRead(9);

    if(switchState==LOW) pressed++;

      attachInterrupt(0, interrupt, LOW);

    //The beat starts at pin 3, runs in consecutive pins, and ends at pin 8 at maximum

     if(buttonState==LOW){//changing time signature - up to 5 beats
          if(ts==8) ts = 3;  //8 - 3 = 5 beats max
     if(buttonState2==LOW){//changing rhythm - quarter note to eighth, then 
             //triplets and sixteenths, back to quarter notes
          if(rthm==5) rthm = 1;
     if(silentState==LOW) silent++; //if silent key pressed, go to silence (only LED's showing) 

      runMetronome();//Run the metronome

  void runMetronome(){
    for(int thisPin = 3;thisPin <= ts;thisPin++)
      //LED's blinking beats (thisPin - LED pin (beat number + 2))
           for(int r = 1; r<=rthm; r++){//nested loop for the rhythm
               bpm = pulseIn(12, HIGH);//pin 12 - tempo potentialmeter
               digitalWrite(thisPin,HIGH);//each LED blinks
               pinMode(13,OUTPUT); //pin 13 - speaker 

              silent%2==0 ? noTone(13) : (count==3 && r==1 ? tone(13,4400,80) : 
                   r==1 ? tone(13,2500,80) : tone(13,2200,60));
              digitalWrite(thisPin,LOW);//turn each off as we proceed to the next beat (LED)
              pinMode(13,INPUT);//speaker input

          if(count>ts) count = 3; //go back to beat 1 

  void interrupt()  {

   void getTS(){
          comdata = Serial.read();
          switch (comdata){
              case '1': ts = 3; break;
              case '2': ts = 4; break;
              case '3': ts = 5; break;
              case '4': ts = 6; break;
              case '5': ts = 7; break;
     void getVoiceCommand(){
            com = Serial.read();
                case 0x11: ts = 3; break;
                case 0x12: ts = 4; break;
                case 0x13: ts = 5; break;
                case 0x14: ts = 6; break;
                case 0x15: ts = 7; break;

It's not loosing connection, there just can't be two devices on the same serial port (I suppose this setup)

You can use software serial for VR module, arduino with more hardware serials (=mega) or you can use another arduino as ISP programmer.

  • There is a arduino SoftwareSerial library to use another serial on almost any two pins. – KIIV Aug 18 '16 at 19:02
  • Pins 0 and 1 are usually used for hardware serial port (and bootloader too). Try some other pins.. – KIIV Aug 24 '16 at 19:03
  • Actually, I got it working as I tested it out, by using English commands: '2', '3', '4', '5', and '6'. But, sometimes, when I say: '8', '1', the wrong messages get printed out in the serial monitor. – Mike Zhou Aug 25 '16 at 1:51

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