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'[PIC]: Very basic hookup help needed'
2001\02\09@091447 by Benjamin Wood

picon face
I'm able to get a PIC16F877 programmed and verified,
but I'm having trouble getting it running on a
breadboard where it should blink a single LED every
couple of seconds.

(1)  Should both Vdd and Vss pins be connected?
(2)  When in-circuit, I have 3 LEDs going.  One to
show if power is on, another on my output pin, and a
third on a second pin which I set to low.  When power
is applied, all three LEDs blink on and off, maybe
once a second for as long as power is applied.

Many thanks,
Benjamin


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2001\02\09@094713 by Byron A Jeff

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>
> I'm able to get a PIC16F877 programmed and verified,
> but I'm having trouble getting it running on a
> breadboard where it should blink a single LED every
> couple of seconds.
>
> (1)  Should both Vdd and Vss pins be connected?

Absolutely and always.

> (2)  When in-circuit, I have 3 LEDs going.  One to
> show if power is on, another on my output pin, and a
> third on a second pin which I set to low.  When power
> is applied, all three LEDs blink on and off, maybe
> once a second for as long as power is applied.

If the power LED is simply connected between Vdd and Vss with a resistor
and it's blinking, then that would point to a power supply problem.

BAJ

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2001\02\09@102821 by M. Adam Davis

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face
Hook up both vdd's and vss's.  Put a small cap across them.

Sometimes a LED sucks up enough power (depending on how you're powering
your chip) that a reset happens whenever you turn your led on.  The cap
should help.

-Adam

Benjamin Wood wrote:
{Quote hidden}

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2001\02\09@112813 by Dan Michaels

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At 06:15 AM 2/9/01 -0800, you wrote:
>I'm able to get a PIC16F877 programmed and verified,
>but I'm having trouble getting it running on a
>breadboard where it should blink a single LED every
>couple of seconds.
>
>(1)  Should both Vdd and Vss pins be connected?
>(2)  When in-circuit, I have 3 LEDs going.  One to
>show if power is on, another on my output pin, and a
>third on a second pin which I set to low.  When power
>is applied, all three LEDs blink on and off, maybe
>once a second for as long as power is applied.
>


You do have resistors in series with each of the LEDs,
don't you? At least 500-1000 ohms in value?

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