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[Andy] demonstrates building an ultrasonic anemometer using a cheap after-market parking distance sensor kit and an Arduino. Demo video after the break.

It was originally published Sept. 1, 2001. Introduction to Proximity Sensors Proximity sensors detect the presence or absence of objects using electromagnetic fields, light and sound.

A low-cost (~$100), do-it-yourself (DIY) ultrasonic water level sensor/datalogger has been designed, constructed, and tested for use in education, citizen/community science, and research settings. The ...