A DIY The Wrench maker has built a smart desk dustbin with an automatic iris-style lid, adding both functionality and a ...

To that end, it uses an Arduino Nano armed with an ultrasonic distance sensor to detect when mice have entered a plastic container. The container’s hinged door is is held open with a servo.

It’s something [mircemk] demonstrates, with an Arduino-powered magnetic field strength meter that uses a UGN 3503U Hall effect device. The circuit is extremely simple, comprising the sensor ...