The experiment is for switching an acoustic sounder as a rain alarm after a predetermine time. It may, however, be tinkered for a number of other applications. Needless to say, this is a simple ...

Similar to the movement sensor we've already covered, distance sensors measure distance using a variety of methods. In this case, Arduino distance sensors use sound to work out how distant objects ...

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 ...

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

A distance sensor provides basic gesture recognition and a microcontroller with wireless connectivity controls both and provides home automation integration as well.