driver properly installed; sketch sucessfully complies, but no results on Uno

Development Tools IDE 1.x
1

Hello. About two weeks ago, I started playing around with Uno R3 on Window 7 and Arduino 1.0 IDE. Everything was working fine, until I ran into a problem this week.

Description of the Problem:

  1. Driver is installed properly and computer recognizes the Arduino. Sketch is complied successfully, but nothing happens on the board.
  • I have tried this with the blink sketch and other simple sketches.
  • During these trials, both the ON and L leds are lighted up. However, the L led does not blink when the sketch is done complying like it did before when everything was working fine.
  1. The Arduino fails the loop-back test. When I type something into the serial monitor, the RX led lights up.

What I have done so far:

  1. I have read and followed the guidelines on the Arduino troubleshoot page, but nothing worked.

  2. I have tried installing different IDEs.

  3. I bought a second, new, and working-properly Uno R3, but the problem still persists.

  • I uploaded the blink sketch using the same USB cable onto the new Uno. Sketch was complied successfully but no physical results on the board.

  1. I have uploaded the blink sketch on both Uno's on two other computers (one is Window 7 and the other is Window XP). The driver were installed properly on all computers and the sketch was complied successfully; but no physical results on the board.

  2. The new Uno also fails the loop-back test.

I have noticed that the sketch complies successfully whether the Arduino is plugged in or not. When I didn't have the problem before, I got an error message when the Arduino was not plugged in while the sketch was being uploaded. The only thing I haven't tried is using a different USB cable. Perhaps, that is the problem. Any suggestions would be greatly appreciated.

Thank you,

Zita

2

Select File:Preferences, and click Verbose Output for compilation & upload.
Report what you see when you compile & upload.

Also, update to IDE 1.0.5, the latest.

3

Thank you for replying so quickly. Fortunately, I have figured out the problem. I have been using the verify button to upload sketches; I did not know there was a difference between the two.

4

I have been having similar problems. I bought a duemilanove board and the sketch compiles fine but when I upload the LED will blink once although its on infinite loop.

I've changed the usb, tried it on both windows 7 and mac OS X, but still no luck. The drivers are correct and work, the right board and serial/com port is selected.
It's becoming very annoying as I feel I've been trying everything.
Any help at all would be most appreciated.

my code

int ledPin=13; 

void setup ()
{
  pinMode(ledPin,OUTPUT) ;
}

void loop ()
{
  digitalWrite(ledPin,HIGH); 
  delay(1000);
  digitalWrite(ledPin, LOW); 
  delay(1000);
}
5

Under File:Preferences, check the verbose output boxes.
Upload again, and post any errors that are being reported.

I have a Duemilanove also, but it has been re-loaded with Uno bootloader, so I select Uno when I load code into it.