In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zoot wrote:

There are a number of other sonar transducers (roll-your-own sensor) and ready-to-go boards that provide distance up to the 10 meter range. Do a search online and you'll turn up all sorts of circuits and ready-to-purchase boards. Cheaper than a laser finder (but a wholly other capability and concept).

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