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'[PIC]: Have I fried my PIC?'
2001\09\15@091842 by James Padfield

picon face
Ok, I've done something pretty stupid.
I built my No-Parts Pic Programmer, plugged it in, powered it up. Software
didn't detect the programmer, but it does say that sometimes this is ok and
nothing to worry about. The voltage regulators were getting really hot,
which I thought was unusual, so decided to ignore it. I put in my 16F84A,
and recieved an error message when trying to program it. So I switched it
off, removed the PIC
When I looked at my cicuit board I realised that, being an utter muppet, I'd
forgotten to cut the copper traces between the pins of the PIC socket. No
wonder the regs were hot!
Anyway, I corrected the mistake. The software now recognises the hardware,
but I'm still getting an error message when trying to program the PIC. Have
I fried the chip do you think?


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2001\09\15@111425 by Bob Barr

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James Padfield wrote:
>
>Ok, I've done something pretty stupid.

Like, who *hasn't? :=)

>I built my No-Parts Pic Programmer, plugged it in, powered it up. Software
>didn't detect the programmer, but it does say that sometimes this is ok and
>nothing to worry about. The voltage regulators were getting really hot,
>which I thought was unusual, so decided to ignore it.

Ignoring the heat was probably not the best move. (I usually don't notice
that there's heat until smoke appears.)

{Quote hidden}

If *all* of the PIC pins were connected together when you tried to program
it, the PIC would probably have survived. All of the pins would see the same
voltage.

My next step would be to check the Vdd and Vpp voltage levels. You may have
fried a regulator or have a mis-wiring.


Regards, Bob


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2001\09\15@125325 by James Padfield

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>>Ok, I've done something pretty stupid.
>
>Like, who *hasn't? :=)

True enough. Some more than others though.

>>nothing to worry about. The voltage regulators were getting really hot,
>>which I thought was unusual, so decided to ignore it.
>
>Ignoring the heat was probably not the best move. (I usually don't notice
>that there's heat until smoke appears.)

I only noticed because I was wondering if the regulators got warm, and burnt
my fingers.

>>I put in my 16F84A,
>>and recieved an error message when trying to program it. So I switched it
>>off, removed the PIC

The error messgae, if it helps anyone, is:
Failed at 0000: Expecting 2823, found 3FFF

{Quote hidden}

No, just opposite pins were connected, ie. 1 and 18, 2 and 17, etc.

>My next step would be to check the Vdd and Vpp voltage levels. You may have
>fried a regulator or have a mis-wiring.

Unfortunately I don't have a multimeter. Yeah, I know, how do I work without
one? Well, so far I managed to get by without... Its next on my shopping
list though, along with a new PIC...


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2001\09\15@132122 by Jeff DeMaagd

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----- Original Message -----
From: James Padfield <spam_OUTpadfield_jamesTakeThisOuTspamHOTMAIL.COM>

> >If *all* of the PIC pins were connected together when you tried to
program
> >it, the PIC would probably have survived. All of the pins would see
the
> >same
> >voltage.
>
> No, just opposite pins were connected, ie. 1 and 18, 2 and 17, etc.

I have put a couple 'F877s in backwards for maybe up to a minute and
they survived.  Your experience may be different though, given a
different chip & circuit.

> >My next step would be to check the Vdd and Vpp voltage levels. You
may have fried a regulator or have a mis-wiring.
>
> Unfortunately I don't have a multimeter. Yeah, I know, how do I work
without
> one? Well, so far I managed to get by without... Its next on my
shopping
> list though, along with a new PIC...

Highly recommended.  If you can swing it, I would suggest getting one
with a frequency counter in it, if for nothing else but to make sure
your oscillators are working when you do build a normal circuit.

Jeff

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2001\09\15@181336 by Bob Barr

picon face
James Padfield wrote:
<snip>
>
>>>I put in my 16F84A,
>>>and recieved an error message when trying to program it. So I switched it
>>>off, removed the PIC
>
>The error messgae, if it helps anyone, is:
>Failed at 0000: Expecting 2823, found 3FFF
>

With the pins connected as you describe below, this doesn't surprise me. The
first location did not program.

<snip>

>>If *all* of the PIC pins were connected together when you tried to program
>>it, the PIC would probably have survived. All of the pins would see the
>>same
>>voltage.
>
>No, just opposite pins were connected, ie. 1 and 18, 2 and 17, etc.
>

Ouch, I'd say PIC = RIP.

>>My next step would be to check the Vdd and Vpp voltage levels. You may
>>have
>>fried a regulator or have a mis-wiring.
>
>Unfortunately I don't have a multimeter. Yeah, I know, how do I work
>without
>one? Well, so far I managed to get by without... Its next on my shopping
>list though, along with a new PIC...
>

On getting a multimeter - absolutely. (And yes, I can't imagine how to work
without one.) You can get a simple but decent one for the price of a very
few PIC's.

Regards, Bob


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2001\09\16@085107 by Alexandre Domingos F. Souza

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face
>Unfortunately I don't have a multimeter. Yeah, I know, how do I work without
>one? Well, so far I managed to get by without... Its next on my shopping
>list though, along with a new PIC...

       ¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿

       Electronics without a multimeter? Man, you ARE brave, eh!?!

       Don't you have 5 bucks to spend in a crap multimeter, or are you looking for an 80-series Fluke? ;o)


---8<---Corte aqui---8<----

Alexandre Souza
.....taitoKILLspamspam@spam@terra.com.br
http://planeta.terra.com.br/lazer/pinball/

---8<---Corte aqui---8<----

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2001\09\16@193047 by Benjamin Bromilow

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Make sure you check the transistor. It's quite easy to put it in place
backwards.... This (amongst other things) would give the above error...
How do I know..... :)

Ben


{Original Message removed}

2001\09\17@023604 by Arpit

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face
How did you do that cool question marky thing?

On Sun, 16 Sep 2001 09:52:22 -0300, you wrote:

{Quote hidden}

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