Hardware

At the 2007 Minos micromouse conference, Martin Barratt gave a talk about his stepper motor driving scheme. For best performance, steppers really need to be driven by a high voltage. However, the current will need to be limited to prevent the motor overheating. Normally this is done with dropper resistors which waste all the energy or with chopper drives that can be relatively complex. Martin has an alternative approach that provides the high voltage needed to produce fast step rates and the low current needed to reduce dissipation and keep the battery size under control.

Tony Wilcox of Birmingham City University has been working with the design and implementation of Infra Red wall sensors for their student micromouse design. This type of sensor has become common in mouse designs although there are several variations on the theme. Tony’s version uses readily available parts in a robust and repeatable design with a couple of extra tweaks that make it possible to use the same sensor to measure distance over a very wide range of distances without having to change the drive current to the emitter…

The Pit Shimizu tyres arrived today.  I had to order them from Hong King and they took a week or so to arrive.