Device was developed to measure distance when riding bicycle. Magnet and magnet sensor (proximity effect) contact was used to sense wheel turn. Project consists of Motorola 68HC908QY4 microcontroller which counts pulse signals coming from reed switch. Data is displayed in 1X16 LCD module.
Schematic is very simple and can be rebuilt easily on universal board. Software is written for ICC08 compiler and can be modified easily. Main modification would be adjusting wheel diameter.