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Magnetic speedometer with display. Reads angular velocity using Hall Effect sensor, outputs data on seven-/eight- segment display. MUST • Take input from sensor • Convert analog voltage to digital data • Calculate speed based on angular velocity, convert to mph • Display in clearly visible way • Low-voltage 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.