An Arduino Leonardo runs the show, ... a HC-SR04 ultrasonic sensor, and a 1602 serial LCD. Once the gadget has been mounted in the proper position and activated, ...

When you power the Ultrasonic Experiment board up in range finder mode, the LCD will read out the distance between the sensor and the object that it is lined up with in centimetres.

It also pushes text to an LCD which reveals the distance from the target. [Anuj Dutt] hand rolled his Arduino just because , but ran into some trouble getting everything to talk to the PC.

In-display fingerprint sensors soon evolved to use faster and more reliable ultrasonic systems. However, sensors embedded in LCD screens will not use this technology, and may suffer from the same ...