Still plodding along with the V1 master and my own slaves. Been getting a lot of interference when the motor is spinning though! I have quietened down the noise on the master bus with a RC lowpass filter (1K/32nf) and some clip on ferrites.
The slaves had a slightly more interesting problem, ferrites on the battery leads helped a bit but I still kept getting cell errors. Here's my old schematic, I've hacked it a bit since then but the relevant bit is unchanged.
http://www.dillond1.pwp.blueyonder.co.uk/agmslave.png When I get a transient on the battery connections and the varistor impedance goes low it will discharge C3 and looks like a dead short to the picaxe. I think if the picaxe is reading at the time, it will get a low reading.
My solution is to connect D2 to before D1 this means if the varistor goes short C3 will not discharge due to D1 and will have plenty of charge to act as a buffer and allow the picaxe to do a more accurate read. I have lost one diode drop on the varistor threshold but that's permissible. I had to put in a wire link and cut a track on each slave! I even got to play with my scope
The moral is, I had only considered how the circuit would react normally......not when in self protection mode
Derek