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'[PIC]: Very basic hookup help needed UPDATE'
2001\02\09@130335 by Benjamin Wood

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To answer a few questions that were brought up...

- The 'power on' LED light is not connected to an
output of the PIC, rather upstream to indicate if
anything in the circuit is receiving power.

- The LED's do have proper resistors on them.

- I have not used up to this point, as was suggested,
caps between the pic and the power supply (which is a
5V 1A regulated wall wart).

Many thanks all the help so far!
Regards,
Benjamin



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2001\02\09@143203 by Robert Shady

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The other thing you might want to check if
you haven't already is the actual voltage
output of your power supply.  More than a
few times I've been surprised by what was
SUPPOSED to be a regulated power supply and
the voltage was nearly double...

-- Rob

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{Quote hidden}

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2001\02\09@150041 by Dan Michaels

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At 10:04 AM 2/9/01 -0800, you wrote:
>To answer a few questions that were brought up...
>
>- The 'power on' LED light is not connected to an
>output of the PIC, rather upstream to indicate if
>anything in the circuit is receiving power.
>
>- The LED's do have proper resistors on them.
>

If you do have an LED right on the power input, and
it does have a series resistor inline, and it is turning
on and off every second or so, then the power is bad, or
the PIC is dragging the Vdd bus down when it boots.

1 - Pull the PIC and check the power/LED.
2 - If ok, check all lines tied to the PIC for shorts and
   otherwise correct hookup - xtals/MCLR/Vdd/Vss pins.
3 - If ok, rewrite your s.w.

- danM

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2001\02\10@022129 by David VanHorn

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>
>- I have not used up to this point, as was suggested,
>caps between the pic and the power supply (which is a
>5V 1A regulated wall wart).

Proper bypassing is critical.
Also, have you checked the voltage? I wouldn't trust a wall-wart unless I
had metered it.

In order for any micro to run right, you have to have power, inside the
voltage spec range at all times, and enough current to meet peak demands.

You have to have supply bypassing at the micro.

You have to provide proper reset input (mclr on pics)

You have to provide proper external crystal and caps (unless using internal
or external R/C oscillator)
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