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Speedometer based on magnet/Hall effect sensor pair.

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.