Battery Vehicle Society

My C rewrite is coming along, to which end I've made up a ZIF header to avoid having to keep removing the PIC to reprogram it: http://s7.imagestime.com/out.php/i532339_IMGP1146.jpg And this is the display on my old Casio pocket TV (in case anyone is interested :) ): http://s7.imagestime.com/out.php/...

Solved

The watchdog PIC wasn't programmed correctly. It was warning me that it would be unreliable if MCLR was disabled while using the internal clock, which I foolishly ignored. Once I'd overridden the MCLR setting in the configuration it programmed correctly

Correction. I've found it in the software now - that'll teach me to post before doing my homework

Guess the next thing is to disconnect the resistor and see if it starts toggling...

Right, I've dusted off the 'scope (not for the last time I'm sure!), and verified that there is no 1S pulse coming out of the watchdog. Looking at the source for the watchdog software I can't see any reference to a 1S output, so I'm concluding that the watchdog software in BMSFiles090211Updated.zip ...

As you were on the slave voltage problem - I reprogrammed all the chips with the software from BMSFiles090211Updated.zip, and I now get 3.32V and 3.36V :D Switch works better with the 1M in place, but... I now get "Watchdog Pulse" errors :( I connected a 1K between watchdog 7 and master 9 ...

That's the main reason I'm going the Headway route - if you get a cell go down in a sealed pack I doubt you could replace it, whereas with the Headways (especially the screw tab ones) you just take the pack apart and replace the offending cell.

I didn't go for any of their other products having heard a tale of woe about one of their BMSs, but I'd already decided to go the "Peter Perkins" route on that anyway!

I got mine from here: http://www.evassemble.com/index.php?mai ... cts_id=151 and the 40160s work out at about $1.58/AH according to my calculations.

I was looking at those - I'm going to configure the pack as 2 cells in parallel, which with the 40160s would give 20C and 32AH (maximum current of 320A!), 25 of these in series to give 80V. In the end due to cost and space considerations I ordered 50 38140S which will give me 24AH, still a maximum o...

Ok, making progress... I've made up the little switch board, but without the RC network as despite multiple searches with various terms I can't find what value resistor to fit - I did find a reference to a 10nf capacitor though. This makes the button use a little "random" but I can at leas...