Arduino Fixed-point Vehicle Proximity Detector

This is the high-tech version of hanging a tennis ball from the ceiling from a piece of string.  Of course, if you have two different types of vehicles, that tennis ball isn't going to land in the same place on both of them.  This project can prevent hundreds of dollars in dry-wall repair and bicycle crank replacements, not to mention the shame of poor parking skills. In this instructable, we'll be making e ...

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