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Blown output BS2

joecamaro68joecamaro68 Posts: 8
edited 2008-11-26 20:01 in BASIC Stamp
How can I tel if I have a blown output on a BS2?

Comments

  • dandreaedandreae Posts: 1,375
    edited 2008-11-24 21:40
    Can you take some voltage measurements?· If so, measure:

    Vin to Vss =
    Vdd to Vss =
    Rst to Vss =

    Let me know what you get?· Also feel free to send me an e-mail at dandreae@parallax.com for additional help.

    Regards,

    Dave

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    Dave Andreae

    Parallax Tech Support·
  • joecamaro68joecamaro68 Posts: 8
    edited 2008-11-25 14:57
    Hello Dave,
    Thanks for the reply. I found the following:
    Vin to Vss = 13V
    Vdd to Vss = 5V
    Rst to Vss = 5V


    Dave Andreae (Parallax) said...
    Can you take some voltage measurements?· If so, measure:

    Vin to Vss =
    Vdd to Vss =
    Rst to Vss =

    Let me know what you get?· Also feel free to send me an e-mail at dandreae@parallax.com for additional help.

    Regards,

    Dave
  • dandreaedandreae Posts: 1,375
    edited 2008-11-25 15:07
    Your voltages are just fine.· Please give me a call at 1-888-997-8267 with your set up ready to test and I'll go over it with you.

    Regards,



    Dave

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    Dave Andreae

    Parallax Tech Support·
  • ercoerco Posts: 20,259
    edited 2008-11-25 17:59
    I just run a short test program to toggle a suspect pin, such as:

    test:toggle 7
    pause 1000
    goto test

    which makes pin 7 alternately high, then low each second. Easy to test with a DMM to verify output.

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    ·"If you build it, they will come."
  • joecamaro68joecamaro68 Posts: 8
    edited 2008-11-25 19:14
    Thanks Erco. Thats just what I did. Output 7 only goes to .3 volts. I guess I poped it! Oh well still have a few left!
  • ercoerco Posts: 20,259
    edited 2008-11-25 23:01
    Joe: If you need all 16 pins:

    1) Test the bad output pin to see if it can still be used as an input. The input circuitry might work even if you smoked the output circuitry. If your application uses both inputs & outputs, you can still have 15 I/Os and one I.

    2) If the pin still reliably switches from 0V low to 0.3V high, you could feed that output into a comparator (LM339 or such, using a 0.2V reference voltage) and use the comparator output instead of the bad I/O pin.

    ercocorvair67

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    ·"If you build it, they will come."
  • Lab RatLab Rat Posts: 289
    edited 2008-11-26 02:08
    that sounds logical might work

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    Believe in it.
  • JDJD Posts: 570
    edited 2008-11-26 20:01
    joecamaro68,
    ·
    We have finished·the BASIC Stamp Tester that is available on the completed projects forum, which will test all the I/O pins for input and output functionality. There is a hand full of parts needed and the assembly of the tester, but it is a great tool for anyone using our BASIC Stamp modules.
    ·
    Also, Parallax offers a 1/2 off replacement policy·for a·new modules if you wanted to get your current module replaced. If you would like to take advantage of this option, please contact Technical Support at 888-997-8267 to establish an RMA number to send the old modules in for recycling.
    ·
    ·
    BASIC Stamp Tester:
    http://forums.parallax.com/showthread.php?p=759839



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    Joshua Donelson

    www.parallax.com
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