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MeeBlip Micro: LED does not light when powering untit
  • stijn303stijn303
    any suggestions anyone on what might could be wrong?
    i checked my solder point and didn't saw anything what could cause a break in the circuit...
    First i've found a pin on an IC that wasn't properly soldered, i thought this would fix the problem but it didn't...

    thx in advance
  • meeblipmeeblip
    First, make sure you're using a 9VDC power supply wit a tip *positive* center. Most guitar pedal adapters have negative center, most household adapters are positive.

    Second, check that there are no bent leads in the IC sockets.
  • stijn303stijn303
    thx for your quick reply... i am using a 9V DC power supply, where i can change the tip positive or negative , on the power supply's connecting jack.
    with the 'bent leads in the ic sockets' you mean that should be something visual should be wrong  where the ic-pins mount in the socker?  i'll check for that if so, didn't checked it yet...

    regards
  • meeblipmeeblip
    Yes, exactly. I sometimes end up with a pin bent right under the chip that I don't notice.
  • meeblipmeeblip
    It might help me if you can link to a clear photo of the top of the board - I can check for mis-oriented parts or stuff that's easy to miss when you're the builder.
  • stijn303stijn303
    I have checked under the 40pin IC, nothing unusual to me, i link you to 3 pics down below, 1 of top finished kit; two others are from the board before ic's were mounted in their sockets...
    http://www.casa-el-hacha.be/Image176.jpg
    http://www.casa-el-hacha.be/Image178.jpg
    http://www.casa-el-hacha.be/Image180.jpg

    regards
  • stijn303stijn303
    i've tested the led yesterday as well with a 3V watch battery, and it worked fine, so this can't be the problem as well...




    any more suggestions?
    regards
  • meeblipmeeblip
    OK, next step is to check 5V power. You'll need a multimeter. With the unit powered, touch the (+) probe to the top left pin of J1 (the 3x2 programming header above the microcontroller) and the (-) probe to the top right pin of J1. You should see a voltage of ~5.00 VDC.

    Would be interesting to know the voltage between the +5V and GND lines on one of the Analog inputs -- P0 through P7. That voltage should be slightly lower than 5V because there's an active pull-up resistor on each line.
  • stijn303stijn303
    multimeter.. check...
    gonna check this tomorrow... is it safer if i check this with the unit powered by a 9V battery instead of the 9V from a
     power supply or doesn't this matter?
  • meeblipmeeblip
    Doesn't really matter. :)
  • stijn303stijn303
    ok... i've got in touch with a friend of me who's more well educated about electronics as i do... he had a quick look at the board, and advised me to check on a few solders as well...   this willbe the case if i can't find 5V tomorrow... :-)
  • stijn303stijn303
    hi, ive checked the 5v on the header and on the analog inputs and this all looked fine... 5v on both...  
    more suggestions?

    regards
  • stijn303stijn303
    bliip bliip... it's alive!

    THX!
  • meeblipmeeblip
    Yeah! Enjoy.
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