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How can I "reset" an Arduino board?

I've uploaded a sketch to an Arduino Uno whose loop is something like this:

void loop(){     Serial.println("Hello, World!"); } 

So, now, I can't upload anything anymore, because the IDE says "port already in use".

Is there a way to "reset" the Arduino without another programmer?

Nothing else is using the serial port, and everything went just fine until I uploaded the previous sketch.

I've found some interesting things:

  • Problems with 0021 on Ubuntu 10.04 Lucid Lynx
  • Re: Problems with 0021 on Ubuntu 10.04 Lucid Lynx
  • Uno sending serial data becomes un-connectable to Serial Monitor
like image 907
dugres Avatar asked Mar 13 '11 15:03

dugres


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How do I reset Arduino?

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Is there a reset function in Arduino?

Lucky for us, resetting an Arduino is way easier. All you have to do is press the momentary push button mounted to the top of the board, and your Arduino will reset. But on some occasions, you may want to build your own external reset button.

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1 Answers

Try the following:

  1. Prepare the basic empty program (empty setup, loop, etc.)
  2. Compile it.
  3. Reset the Arduino using the hardware button on the chip
  4. Press Ctrl + U to upload your code.
  5. If unsuccessful - got to 3.

There is a delay before the boot loader starts the programs, just work on your timing. It worked for me when a bug in my Arduino's code was executing a soft reset every 500 ms.

like image 199
Valed Avatar answered Sep 27 '22 16:09

Valed