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Wiring ForumWiring HardwareTangible computing › Connecting too low voltage

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Connecting too low voltage (Read 10881 times)
05/09/07 at 18:18:49

geiger   Offline
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Hi,

I connected the board to 12V batteries and it worked in a wiered way. Later, measuring the voltage, I saw they were almost empty (gave around 4.5V).

When connecting the board to normal voltage source, it continued the same behaviour, and when trying to upload it with any program, it showed signs of good communication (Rx and Tx leds blinking), but the software onboard didn't change.

Did I ruin my board?  Lips Sealed Can it be fixed in a cheap way (ran out of funding...)

Thanks.
 
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Reply #1 - 05/09/07 at 21:48:07

barragan   Offline
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how do you connected the batteries? can you post a diagram?
 
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Reply #2 - 05/10/07 at 07:07:07

geiger   Offline
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I just connected two parallel 12V batteries to the external power supply. It worked perfectly in the past, but now the voltage has dropped it caused all those troubles.

The circuit is on:
http://www.flickr.com/photos/8239875@N06/492198352/
 
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Reply #3 - 05/10/07 at 07:44:41

barragan   Offline
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after the troubles have you tested the board powering from the USB? (uploading, running an example, blinking the board led etc.)
 
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Reply #4 - 05/11/07 at 19:28:51

geiger   Offline
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We tested it. Still same problem.
Is it possible the boot loader was damaged?
 
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Reply #5 - 05/11/07 at 23:58:01

barragan   Offline
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Well if the board is accepting a new program then the bootloader should be there. In any case the bootloader can be reprogrammed again through the ISP connector on your board, I can send you the file.
 
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Reply #6 - 05/12/07 at 08:05:02

geiger   Offline
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Problem is the board doesn't get new programs...
Sent you a massage for getting the bootloader.

Thanks.
 
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Reply #7 - 05/14/07 at 14:32:58

geiger   Offline
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Israel

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Hi,

I burned the bootloader (using a home-made parallel-port serial programmer) and now it works!  Grin
After reading a bit more, I saw that low voltage can corrupt the memory, including the bootloader (though theere is ai internal protection inside the Atmega128, and it is activated in Wiring). Anyway, burning the bootloader fixes the problem.

Thanks for the support.
 
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Reply #8 - 05/14/07 at 14:55:12

barragan   Offline
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Cool, thanks for posting your restults. would you be interested in writting a tutorial for doing this? I can help/assist you with anything you need.
best,
H.
 
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Reply #9 - 05/29/08 at 18:21:08

gokce   Offline
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This is an old post but I see that geiger did not write any tutorial describing the solution .

I myself made the same error: connected 3.3V through the VCC and GND pins. The board works but I am unable to upload new code.

I have a home made Parallel Programmer, I did not succeed in burning the bootloader. I used the Parallel Programmer described in Arduino website, with the bootloader from http://www.avride.com/article/wiring/.

What could be the problem? I know the cable is working correctly because I used it with Arduino boards.
 
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Reply #10 - 06/03/08 at 17:03:44

gokce   Offline
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Which bootloader should I use from the http://www.avride.com/article/wiring/ ?

My board is v2.
 
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Reply #11 - 06/04/08 at 15:52:28

barragan   Offline
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Get it from here: http://wiring.uniandes.edu.co/source/trunk/wiring/bootloader/
 
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