OK, well this isn't working.

If anyone wants to build me one (for a price, of course), e-mail me
individually and I can send you details..
I only offer this because I feel there isn't a specific 16F877 programmer
out there and (evidently) I lack the knowledge to build one that works! ;)

Of course, if anyone has ideas regarding my current setup that would still
be helpful!!

Look forward to hearing from you ;)
-Kieren

----- Original Message -----
From: "Jim" <james3162@WORLDNET.ATT.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, August 03, 2002 9:23 AM
Subject: Re: [PIC]: My latest woes! (programming)


> At 12:00 PM 8/3/02 +0100, you wrote:
>
> Hey guy
>
> >Hiyas,
> >I built Jim's programmer (uses 74HCT125 now)... anyway now I have the
> weirdest results yet (yay)!
> >Just as an example, I'll do some stuff riiiight now..:
> >
> >* Turned on +12V, +5V (actually more like 3.6V - 3xAA rechargable), but
> programming
> datasheet says this is fine)
>
> Hmmm I don't know about 12v did you build the 2 regulators into the
circuit?
> I'v seen it mentioned on the list before that 12v is pushing it. with the
lm317
> you get 13v. I have been using my programmer to program my robot which has
> a large 12v gelcell and a 7805 regulator of it's own to power the 16f874
but
> alot of times I get failed to program running it from that 5v. I have to
connect
> it to my bench 5v supply then it always works. So maybe you are have
trouble
> with your battery supply for 5v.
>
>
> >* Loaded FPP, checked setup (ok)
> >* Clicked read, ok
> >* Woo!  Screenfulla' 3F8C's code, 00 00 etc. data
> >* Clicked load, loaded FLASHLED.HEX
> >* Clicked program, ok
> >* "Failed to program code!" instantly
> >* Clicked read, ok again, for kicks.. got 2C24 followed by 8 0000's, then
> all 3F8Cs.  Near the end, 3FFF x4, 0000, then 3F16 09A5.  Data is now all
> 80's!  Config has also changed, from "####" to "2C24"
> >* Reset power supplies, clicked read, got 3FFF, load of 0000s, data all
0000s.
> >* Ooie, transistor is hot.. I'll try turning it round *shrug*.. nope, now
> it all reads as --Blank-- and still fails to program.. turned it back,
reads
> 3FFF then 00s again.
>
> Ok I'm getting the feeling that your using an external 12v supply for mclr
> that may work
> for programming but if you are note the schematic you are connecting 12v
to
> the collector
> of the transistor through 100 ohms this may be to much current in the
> schematic 13v
> goes to mclr through a 2.2k then the transistor when turned on pulls it to
> ground
> through the 100ohm total 2.3k resistance. I used a 2n3904 suface mount
> transistor here
> and it's running cool. (god it's hard to concentrate with a 2 year old
> crying for barny)
> If you want to try programming with a 12v supply connect it to mclr
through
> a 2.2k
>
> If all else fails. Disable read by setting (read & in) in fpp setup to
nothing
> program the chip see if it flashes the led.
>
> Jim
>
>
> >* Doesn't work if I connect +12V connectly to MCLR either (with 100ohm
> resistor)
> >
> >I have... no idea.. if anyone is recognising anything click that lil
reply
> button :)  Thanks
> >
> >-Kieren
> >
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> >
> >
> >
>
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