16f628 Help Me And My Pupils!!!!!!!

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  1. - 9th March 2006, 17:49 #1
    Mr. Wakefield's Avatar
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    Unhappy Some success

    I have managed to get the PIC board using the 16F627 to work. When the input goes high ouput 7 producess a number of pulses pending which input is used. This works successfully.

    However, when I attach the fly lead to the clock on the 4026 it dies not count up when a button is pressed. I have added a pull down resistor and diode.

    Furthur more. A poulse is seen to be recieved when a multi meter was placed on the pin. Very strange.

    any suggestions
  2. - 10th March 2006, 05:20 #2
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    sougata
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    Default Can we have the schematic and code please

    Dear Mr. Wakefield,

    A look at the schematic with the associated code may help forum members to track down your problem. Otherwise only blind guesses.
    Regards

    Sougata
  3. - 11th March 2006, 09:39 #3
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    Red face

    I will post one up Monday when back at work. Thank you for your time.
  4. - 11th March 2006, 10:45 #4
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    Hi,

    Make sure the PIC and the 4026B use the same +5V and same GND.

    See page 20 and 21 of this PDF.
    http://www.rev-ed.co.uk/docs/PIC_electronics.pdf

    Best regards,

    Luciano
  5. - 11th March 2006, 17:37 #5
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    DynamoBen
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    Luciano, thats a great document. Any others that might be usefull?
  6. - 16th March 2006, 14:48 #6
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    Default Some more success!!!

    The PIC worked on the breadboard today and when linked to the standard PCB it worked. However, when I placed the PIC in the same PCB and power supply the circuit stopped working. I have attached a PCB copy of the circuit
    Attached Files Attached Files
  7. - 17th March 2006, 00:37 #7
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    Any schematic?
    Any Filtering problem?
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
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