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zStamler edited this page Oct 19, 2017 · 11 revisions

Welcome to the Speed Demon wiki!

Magnetic speedometer with display. Reads rotations per minute (rpm) using wheel-mounted magnet and Hall Effect sensor, outputs data on yet-to-be-determined visual display. Based on STM32F072 MCU.

MUST

Sample wheel rotations using Hall Effect sensor to determine RPM
Convert RPM to MPH
Display MPH in clearly visible way
Low-power operation and small, weather-resistant package suitable for mounting e.g. on bike, skateboard

SHOULD

User-Parameterizable wheel diameter
Different units (kmh, m/s, rpm, etc), selectable at run-time with some visible mode indicator.
Resettable distance/trip monitor

BONUS

Phone connectivity/interfacing eg through Bluetooth or similar
Charging capability, perhaps using solar.