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Ultrasonic sensors at the bottom of each tube measure the distance to the weights. The weights sit in static equilibrium, so they serve the purpose of keeping the string taut without negatively ...

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 ...