James,
it doesn't sound like you have any current limiting, that is, a resistor in
series with your LED. In that case, and based on your power supply test, you
may have already killed the LED. A few hundred ohms should be fine, but you
gotta have something there.
Regards,
- Marcel

On Tue, Apr 29, 2008 at 1:26 PM, James Alspach <piclist@alspachnet.com>
wrote:

> I have been lurking for a long time now and I finally bought a PICit 2 and
> am excited to get past the first step...flash a LED.
> I decided to use a 16F628A partly because I did not have the parts
> available
> to add a clock (I am looking for a good place to buy low quantity ceramic
> resonators hopefully with the caps built in).  I used the 'simple' sample
> program changing only the processor type.
> I put the chip on a solderless bread board and ran power to pins 5 and 14
> I
> also ran a wire from pin 8 to one side of an LED and from the other side
> back to the power rail.
> I was able to program the chip successfully (the PICit recognized the
> chip,
> uploaded the program, and verified it.) but the LED does not light (on the
> bb, the ones on the PICkit work just fine). I tried switching the wires
> going to the LED in case I have the polarity wrong (unfortunately I
> removed
> this from an old CDROM and there is no flat side or longer lead) I know it
> works though since I can quickly put it to the power supply and it lights
> (This would tell me the polarity if I had thought to pay attention).  I
> also
> tried switching which rail I take the other side of the LED to (positive
> or
> negative)..and then swapping the wires to the LED again.  All to no avail.
>
> Now for where I imagine the problem is coming in (let me know what you
> think).
> 1) I have not tied any of the other pins to anything.  Can I tie them all
> (selected pins?) to a resister and then that to the negative rail or do I
> need enough resistors for every unused pin?
> 2) The power supply is an old Motorola cell phone wall wart charger.  It
> gives me about 4.6V @ up to 1.5 A but I have not put any caps anywhere.
>
> I have read the FAQ's and searched online but am not sure where to head
> next.
>
> Thanks for your help;
> James
>
>
>
> --
> >From the desk of
> James, Melody, James and Savannah..
> ...its a big desk.
> p.s. before you forward anything to us...please check www.snopes.com
> <http://www.snopes.com>
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