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Arduino Forum Arduino doesn't create com port
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Related

Arduino doesn't create com port

ntewinkel
ntewinkel over 12 years ago

Hi all,

 

I was leading an Arduino workshop today (using http://www.oomlout.com/a/products/ardx/ image ), and one of the Arduino UNO compatible boards was not creating a com port - it powered up, the usual startup sketch with the blinking light runs, but you cannot see it from the software so getting the next sketch in wasn't working.

 

Switching it out with another UNO fixed it, so we know the software/computer side is all working.

 

My question: is there anything I can do with this board to fix that?

I'm hoping it's something simple and silly. I don't want to spend hours on this, so if the simple answer is "it's bricked" then I'll accept it and move on image

Sending it back would cost more than it's worth.

 

I realize there's a pretty good chance that I can still program it with a roundabout technique, so if all else fails I can always use that route and then make it part of a more permanent project someday.

 

Thanks!

-Nico

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  • ntewinkel
    ntewinkel over 12 years ago +1
    I wonder if the com chip (atmega8u2?) wasn't programmed properly. Do you think this is what I need to do? http://arduino.cc/en/Hacking/DFUProgramming8U2
  • billabott
    billabott over 12 years ago in reply to ntewinkel +1
    Have you considered possibility of a cold solder joint causing the difficulty? likely the 8u2? does the 8u2 have power? Also even easier to try is to pull up the ATmega328 and re-seat its pins. FYI Massimo…
  • billabott
    billabott over 12 years ago in reply to ntewinkel +1 suggested
    well, Nico, it does sa y: " To verify you have reset the 8u2 chip: In the Arduino programming environment, check the list of serial ports. The serial port for your board should no longer show up. " Which…
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  • ntewinkel
    0 ntewinkel over 12 years ago

    I wonder if the com chip (atmega8u2?) wasn't programmed properly.

    Do you think this is what I need to do? http://arduino.cc/en/Hacking/DFUProgramming8U2

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  • R_Phoenix
    0 R_Phoenix over 12 years ago in reply to ntewinkel

    Hay you tried re-installing the bootloader?

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  • R_Phoenix
    0 R_Phoenix over 12 years ago in reply to ntewinkel

    Hay you tried re-installing the bootloader?

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  • ntewinkel
    0 ntewinkel over 12 years ago in reply to R_Phoenix

    @R_Phoenix, I just tried reinstalling the bootloader (via a good arduino uno).

     

    That seemed to work properly, but the bad board still doesn't show up as a serial port (and the bad board now doesn't blink the light anymore, so I guess it has no sketch in it anymore).

     

    I was hoping I'd be able to upload a sketch onto the bad board using the same wiring, but that doesn't seem to work either. I do have the 10uF capacitor in the good board (which is serving as ISP) as the instructions say to do for the uno.

     

    edit: same setup doesn't let me upload a sketch to a properly working uno either, so it's probably something I'm doing wrong for that. I did choose "Tools-Programmer-Arduino as ISP", but it gives me an error when trying to upload the sketch.

     

    Thanks,

    -Nico

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  • billabott
    0 billabott over 12 years ago in reply to ntewinkel

    Mr. Stimmer has an option you could try if you have time. 

     

    http://arduino.cc/forum/index.php?PHPSESSID=2ff4219a7fe3a4ee845f382797cc6171&topic=111.msg759#msg759

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