Just trying to find out if my Arduino UNO R1 board is broken or not.

First of all, everything seems normal, Arduino board shows "on" (green) when I plug it on my computer, I also can verify and upload programs to my Arduino board. But, no matter what program I upload the pin 13 turns on and off 3 times and that's it. I'm checkin it by using a LED. Eg. if I want to use another pin (ex. 7, 8, 12) it doesn't work, or even to write a program for turning on/off 9 times pin 13 doesn't work...

Note: I noticed that pin 8 turns the LED for less than a 1/2 a second.

I already tried to restart board by bridging the reset pin and also by pushing reset directly on the board, I also reinstalled Arduino Genuino Application. I thought to update Atmega8U2 firmware but accordingly to Arduino site I don't need to update since I have firmware rev. 0.01.

It would be also great not to have to buy a new Arduino UNO. Thanks for your help

Edit: Here is how I'm trying to make pin 12 work

int ledPin = 12;

void setup()
    pinMode(ledPin, OUTPUT);

void loop()
    digitalWrite(ledPin, HIGH);
    digitalWrite(ledPin, LOW);
  • Maybe the board is fine, but your programs are bad?
    – Majenko
    Feb 28, 2016 at 13:19
  • @Majenko that's also an possible. But I'm checking with a really basic tutorial. See my update please
    – Pompeyo
    Feb 28, 2016 at 13:25
  • 1
    And what do you have wired to pin 12?
    – Majenko
    Feb 28, 2016 at 13:31
  • The anode of a LED and the cathode to GND
    – Pompeyo
    Feb 28, 2016 at 13:41
  • No resistor? Maybe you are suffering from brownouts then.
    – Majenko
    Feb 28, 2016 at 13:42

1 Answer 1


The best way to check if Arduino is working or not is to install Firmata. Here's the necessary steps:

1) Download Firmata application from the official website.

2) Connect Arduino to the computer

3) Open the Arduino IDE and burn the example Standard Firmata [File - Examples - Firmata - Standard Firmata]

4) Open the application, leaving the Arduino connected.

5) Chose the right serial port and debug every pin =D

  • So it turns out, that I was uploading my program to the wrong board. Thanks for the help!
    – Pompeyo
    Feb 28, 2016 at 21:28

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