Post by thread:Motor Control

Hello everyone, This is the first message I've put out on this, so here goes. I am a student at Leeds University, England and I am undertaking a project to build a 1 cubic inch microrobot. I have decided to use a PIC as the intelligence of the microrobot (probably the 16C71 or 16C84). The PIC chip receives 4-bits of data (from a IR decoder chip) - telling the robot what to do (eg go forward, or turn left, etc). The PIC chip then interprets these bits as a code and performs the appropriate task. The PIC controls the two stepper motors of the robot using the 8-bits of PORTB. I am completely new to PIC chips and have very little idea of what to do. So, does anyone have any advice? One of the 4 code bits from the decoder is a valid transmission bit which goes high for 4 clock cycles. Is it possible to use this as interrupt?

1 cubic inch? Nnngh. <Gets his ruler out and has a look at just how _small_ 1 inch seems :> A PIC will do what you want easily, though at that size I would be considering one of the SOIC 12Cxx (8 pin) device which have a built in oscillator, and using the PIC directly to decode the IR transmissions (thereby missing out the IR decoder chip). I suppose then you would have difficulty driving two stepper motors directly. Is it really essential to use stepper motors? A bigger (in more ways than one) problem is getting small enough batteries and motors which can still do useful work and do not cost a fortune. If you do follow my advice and ditch the IR decoder chip, you will need to look into what is necessary to distinguish between an actual transmission and background noise, and also preferrably have some form of addressing (So you can talk to more than one 'bot at once), and error correction (IR is an extremely noise prone form of transmission). Good look with the project, it sounds extremely interesting. PATEL D wrote: > > Hello everyone, > > This is the first message I've put out on this, so here goes. > > I am a student at Leeds University, England and I am undertaking a > project to build a 1 cubic inch microrobot. I have decided to use a > PIC as the intelligence of the microrobot (probably the 16C71 or > 16C84). The PIC chip receives 4-bits of data (from a IR decoder chip) > - telling the robot what to do (eg go forward, or turn left, etc). The PIC chip {Quote hidden}> then > interprets these bits as a code and performs the appropriate task. > The PIC controls the two stepper motors of the robot using the 8-bits > of PORTB. > > I am completely new to PIC chips and have very little idea of what to > do. So, does anyone have any advice? > > One of the 4 code bits from the decoder is a valid transmission > bit which goes high for 4 clock cycles. Is it possible to use this > as interrupt? -- ------------------- Linux- the choice of a GNU generation. -------------------- : Alex Holden- Caver, Programmer, Land Rover nut, and Radio amateur (M1 CJD). : -------------- www.geocities.com/CapeCanaveral/Lab/1532/ ---------------

part 0 1390 bytes <META content=text/html;charset=iso-8859-1 http-equiv=Content-Type><!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN"><!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN"> <META content='"MSHTML 4.72.3110.7"' name=GENERATOR> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT color=#000000 size=2>Due to a crash on my e-mail, I have lost the address of the person that sent me</FONT></DIV> <DIV><FONT color=#000000 size=2>a program called motor.asm.  This was for a motor control to move a screen up and </FONT></DIV> <DIV><FONT color=#000000 size=2>down, the motor having 2 windings, forward and reverse.I have a few questions about</FONT></DIV> <DIV><FONT color=#000000 size=2>the program, and if you would, please send an e-mail to </FONT><FONT color=#000000 size=2><A href="spam_OUTtomTakeThisOuTcomtronix.com">.....tomKILLspam@spam@comtronix.com</A></FONT></DIV>> <DIV><FONT color=#000000 size=2></FONT> </DIV> <DIV><FONT color=#000000 size=2>Thanks</FONT></DIV> <DIV><FONT color=#000000 size=2></FONT> </DIV> <DIV><FONT color=#000000 size=2>Tom Adams</FONT></DIV></BODY></HTML> </x-html>