Dude you have everything you need in front of you. I will try to help you since you built my (version of parpic) programmer. Just give me some info do you have electronics training at all? do you live in the USA i.e. radio shack near by? Did you try what I said? have you used the FPP build in test? this is a killer proggie it will toggle rb6,rb7 & mclr so you can check it with a meter and even read the input status. It will almost debug your circuit for you. But it does take some effort. Let me know. Jim At 10:47 PM 8/3/02 +0100, you wrote: >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" >To: >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 >> > >> >-- >> >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >> >email listserv@mitvma.mit.edu with SET PICList DIGEST in the body >> > >> > >> > >> >> -- >> http://www.piclist.com#nomail Going offline? Don't AutoReply us! >> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body >> > >-- >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > > > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu