On Sat, Mar 13, 2004 at 12:13:06AM +0000, Spyridon Dimitriou wrote: > --- Byron A Jeff wrote: > On Fri, Mar 12, 2004 at > 10:09:08PM +0000, Spyridon Dimitriou wrote: > > > Under normal circumstances I'd let this go without comment. But as the TLVP > > developer I know better than to do that. So a further question: > > > > Exactly what voltages are at the PIC socket of the programmer? > > > pin 4 VPP 13.33V > pin 14 VDD 1.88V > pin 12 RB6 2.55V > pin 13 RB7 2.55V There you go. that 2.55 nor 1.88 on pins 12-14 is going to work for any part. Vdd needs to be at +5 and the other two at least 4V. > > (all measured using Pikdev's pin test functionality) > > > > So, would my other option would be to use a different linux programmer to > > > try and program the pic? > > Ok here things are starting to get interesting. I downloaded Brian Lane's > picprog v2.3.0 and tried to configure the programmer and this time, I could not > read any voltages on the pic pins ????? really confused > > So I measured the voltages on the cable using both software and > PikDev picprog > D0 (data from pic) 3.36 0.21 > D1 (clock) 3.36 0.21 > D2 (VDD) 0.21 3.36 > D3 (VPP) 0.21 3.36 > > I know that I should be able to read the schematic and understand what is going > on, but alas I am new to all of this (microcontrollers and electronics ... > sorry). > > Thanks to everyone for their help. Very much appreciated. Ah good sir, you cut out the important part of my message! Build a THVP. It'll fix your problem. You'll need an external 5V but it's easy to get from the PC (USB, game port, PS2 port, or in a pinch from an internal disk connector). Or you can simply take your 13V you already have and regulate it to 5V. The 16F84A needs to be at 5V for Vdd and at least +4V for both clock and data. Hope this helps, BAJ -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads