Hi,
Yeah I just spotted that myself, so have kept the 10k.
I checked the sheet for the L293, it needs at least 4.5v so 5v might do, but I have taken your point on bad design and checked over the stuff on the ITP site and think that the 9V might be a better option? As long as I limit the speed of the 3v motor it doesn't get to hot, is this a good idea or is just lack of knowledge/laziness that is letting me believe it might be alright to supply 9V to a chip that is driving a 3V motor?
The conversion times for the a/d converters on the Atmega are "13 - 260 [ch956]s Conversion Time". I have to admit I'm all that sure what this means and what I need to do about it...? Adjust the baud rate perhaps, its running at 9600 at the moment...?
The whole system appears to be working on and off but, and this might be a stupid question coming up, the main problem I seem to be having is that even touching/knocking the pot can cause large jumps in the motor's speed (which is why I replaced the pot with a resistor as an experiment) . I am pretty sure the pot is soldered well, I've used it for other things recently, is this just loose wiring somewhere? With the 1K resistor replacing the pot the speed was consistent at least, so it appears to be the presence of the pot that is throwing some chaos in.
Which means I am kind of stuck where I started again...