<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=UTF-8">
<META NAME="GENERATOR" CONTENT="GtkHTML/3.18.3">
</HEAD>
<BODY>
Thanks to all that turned up. Come along next Sunday afternoon!<BR>
<BR>
* Paul started converting an optical mouse into a camera (e.g. <A HREF="http://spritesmods.com/?art=mouseeye">http://spritesmods.com/?art=mouseeye</A> or use google).<BR>
<BR>
Jimmy and Paul worked together using a Parallax Propeller (thanks Hanno!) to do the SPI interface but didn't get it running (I heard good comments about the availability of code for the Propeller).<BR>
<BR>
* Jimmy also freed the magic smoke from his H-bridge (SLA batteries can deliver some hot Amps where they are not wanted!).<BR>
<BR>
* I finished a power supply so my robot can now run from batteries, and completed the electronics to drive the motors. This Wed & Sun is to mechanically connect everything together into a single robot (using Mecanno!).<BR>
<BR>
* Greg explained to me that our perception of brightness is logarithmic so to make a LED get brighter linearly using PWM the duty cycle needs to change exponentially.<BR>
<BR>
* Charles had some excellent practical advice for using ATMEGA microprocessors and his son Timothy just produced: his NXT robot was working and he was making changes to it.<BR>
<BR>
* Richard discussed stepper motors and micromice (he earned a small 5V 1.8degree stepper motor out of an old 5.25 inch floppy drive).<BR>
<BR>
Sorry for those I have missed out in the above... Thanks everyone!<BR>
<BR>
Morris
</BODY>
</HTML>