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  1. #16
    Sourav
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    Default Re: Pic16f877a

    Sir,
    I can't say accurately
    But yeah there is a distortion in first pushbutton
    That means the buzzer is making some unwanted noise in pushbutton 1 ,while in other pushbutton's the buzzer is behaving normally

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  3. #17
    Prolific Poster charliecoultas's Avatar
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    Default Re: Pic16f877a

    Your code is basically the same thing four times. If the 2,3 and 4 circuits work OK then I can only think that there is something wrong with your circuit (a wiring mistake or bad soldering on the "1" channel) or your 16F877A is faulty. The only other possibility is there there is some other peripheral causing a problem - perhaps a forum member who knows this chip could advise you on this?

    Charlie

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  5. #18
    myeeplacee
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    Default Re: Pic16f877a

    Try switching PORTD.0 with another port in the program (swap D.0 with D.1) and see if the problem moves with the switch. If it does your problem is in the Board just like Charlie sugested. If it is a component issue the first thing I would try is a new push button on D.0

    The other thing you could also try is to use PORTs D1 through D6 That would eliminate any issues with PORTD.0 on the PIC.

    You could be experiencing BOUNCE on that push button

    Read about using "BUTTON" on page 136/137 in the 8-bit Proton "Compiler Development Suite" .PDF

    If you use the BUTTON command you should also change the wiring schematic as suggested on page 137.

    Troubleshooting often takes more effort than design.

    Dennis

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