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Schematic | by cibomahto
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Schematic

The basic idea is to use a 555 timer in voltage controlled oscillator mode. The distance sensor outputs a variable voltage corresponding to the distance to the nearest object. The signal level isn't quite what the 555 wants to see, however, so a 10k potentiometer was added to the sensor output to do a slight level shifting. The component values listed here just happened to work from me, and the whole thing could undoubtedly be improved with a small amount of work.

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Taken on October 26, 2008