BIKE_SPEEDOMETER_CIRCUIT

Published:2009/7/16 5:39:00 Author:Jessie | From:SeekIC

The proximity detector senses the passing of the PC board pieces as the wheel rotates, providing an output signal, which has a clean transition between high and low voltage levels, and is ideal for triggering counting or processing circuits. Next is the frequency-to-voltage converter, and, because a reasonable degree of accuracy is required, the LM2917N-8 IC has been chosen. The output from this IC is fed to two bar-graph ICs, which drive a 20-LED display.



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