On Fri, 26 Jun 1998 10:11:08 +0200 Frank Tamminga writes: >Michael Hearn wrote: > >> I just want to check whether it is true that the PIC models that can >> deal with analogue ports can only be blown once. >> I am doing a project at school that involves making a robot that can >follow >> a white line made of masking tape (MicroMouse by the IEE) and I was >> wondering what sort of motor we should use. As one of the designers of a winning line-follower IEEE project car, I could go on for quite a while about this. Here's just a couple of major comments. If at all possible, don't build your own car. Try to find a R-C model car that meets the contest rules. You want a conventional design with two rear wheels driven by a DC motor through a differential, and one or two steerable front wheels. A suspension system helps a lot as you get to higher speeds. A good line following robot need not, in fact almost should not, have a processor in the loop. Analog circuitry works just as well and is much easier to "tweak" for best control by installing variable resistors and socketed capacitors where needed. I would probably include one in the next car I build to simplify a few parts of it, but that's because I'm already familair with both line-following robots and PIC processors. If you're just getting started, stick to op-amps. _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866]