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Topic: avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xf2;  (Read 805 times) previous topic - next topic


Hello I am totaly new to Arduino, and I was trying to upload the code, I have an Arduino Uno R3 ATmega328p,
I am not really experienced at this stuff and I had this problem.

Error uploading Sketch:
    avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xf2
    avrdude stk500_recv() programmer is not responding
    avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xf2

The code is as follow:


String inputs;
#define relay1 2 //Connect relay1 to pin 9
#define relay2 3 //Connect relay2 to pin 8
#define relay3 4 //Connect relay3 to pin 7
#define relay4 5 //Connect relay4 to pin 6

void setup() {
  Serial.begin(9600); //Set rate for communicating with phone
  pinMode(relay1, OUTPUT); //Set relay1 as an output
  pinMode(relay2, OUTPUT); //Set relay2 as an output
  pinMode(relay3, OUTPUT); //Set relay1 as an output
  pinMode(relay4, OUTPUT); //Set relay2 as an output
  digitalWrite(relay1, LOW); //Switch relay1 off
  digitalWrite(relay2, LOW); //Swtich relay2 off
  digitalWrite(relay3, LOW); //Switch relay3 off
  digitalWrite(relay4, LOW); //Swtich relay4 off 

void loop() {
  while(Serial.available()) //Check if there are available bytes to read
    delay(10); //Delay to make it stable
    char c = Serial.read(); //Conduct a serial read
    if (c == '#'){ break; } //Stop the loop once # is detected after a word
    inputs += c; //Means inputs = inputs + c
  if (inputs.length() >0)

    if(inputs == "A")      { digitalWrite(relay1, LOW); }

    else if(inputs == "a") { digitalWrite(relay1, HIGH); }

    else if(inputs == "B") { digitalWrite(relay2, LOW); }

    else if(inputs == "b") { digitalWrite(relay2, HIGH); }

    else if(inputs == "C") { digitalWrite(relay3, LOW); }

    else if(inputs == "c") { digitalWrite(relay3, HIGH); }

    else if(inputs == "D") { digitalWrite(relay4, LOW); }

    else if(inputs == "d") { digitalWrite(relay4, HIGH); }


Do you have the correct COM PORT ?


If else

Try burning a new bootloader


You should check your COM Port and Board selected.

First check Tools / Port / Com & then Tools / Port / Board. The problem will resolve.

If you can't find your COM Port then you need to install Arduino drivers.
My collection of Arduino Projects ====> https://www.theengineeringprojects.com/2015/03/arduino-projects.html

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