Hi Tan. What I have is an 8-bit digital system than can send 8 bits at a time but at a fairly low rate, like 10 Hz or so. If that is good enough for you, then I recommend you go to www.glolab.com and look at some of their stuff. If you want or need more details, please write back and I'll give you what I can. Have fun!! Michael >From: code >Reply-To: pic microcontroller discussion list >To: PICLIST@MITVMA.MIT.EDU >Subject: Re: [EE]: 12 Vdc motor advice? >Date: Wed, 17 Oct 2001 19:16:44 +0800 > >hello, > i'm sorry but this is abit of side tracking. I'm a newbie in >electronics. You'd mentioned RF in your post to the piclist and I'm very >interested in knowing how to build one. Is it possible to send the >schematics to me? > >Regards, >Tan > >----- Original Message ----- >From: "Michael Vinson" >To: >Sent: Wednesday, October 17, 2001 12:27 AM >Subject: [EE]: 12 Vdc motor advice? > > > > Greetings all. My kids have been begging me to build some kind of > > robot. I'm thinking of something like an 18" square platform (wood, > > initially), cruising around via radio control from my main computer > > setup. It'll have an ultrasonic ranger (that I've already built) on > > it, a PIC to talk (via RF, I've already got that part done) to the > > computer, etc. The place where I'm stuck is the motors. I'm thinking > > of two drive wheels, each with its own PWM-controlled motor with a > > sensor to measure how fast and how far each one has rotated. So what > > I need are two fairly hefty, 12-Vdc motors, reversible. I have an old > > windshield wiper motor from a former car, but it seems (?) to have > > the field in series with the armature (?)... at any rate, I can't > > get it to go in reverse, which is crucial since if I use two matching > > motors, one will have to go one way (CW, say), while the other goes > > the other way (CCW). It doesn't need to go very fast...60 RPM or so > > would be fine. > > > > Any advice? Pointers to advice? I suppose it should go without saying > > that I don't want to spend much money on these things, so any hints > > on finding them used or otherwise cheap would be much appreciated > > (the reason I thought of windshield wiper motors is that I figured > > I could get them from a junkyard). > > > > Thank in advance! > > > > Michael > > > > Thank you for reading my little posting. > > > > > > _________________________________________________________________ > > Get your FREE download of MSN Explorer at >http://explorer.msn.com/intl.asp > > > > -- > > http://www.piclist.com hint: The PICList is archived three different > > ways. See http://www.piclist.com/#archives for details. > > > > > > > >-- >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > > _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body