Show compliments only when HC-SR04 sensor says someones near the mirror

[semox]

Hi,

has anyone already solved the use case to show compliments only when someones near the mirror (i.e. lower 50 cm) for a given delay (i.e. 30 seconds) by using a HC-SR04 sensor?

• thobach has solved this by using a GP2Y0A21YK and a separate Arduino (https://github.com/thobach/MMM-Gestures) but I don’t want to do this.

• mochman does something similar. It recognizes swiping gestures by using two HC-SR04 sensors. (https://github.com/mochman/MMM-Swipe)