One way to accomplish this involves four HC-SR04 ultrasonic sensor ... For example, at first, only one unit was transmitting at a time, so there was no way the Arduino could identify two objects ...

One way to accomplish this involves four HC-SR04 ultrasonic sensor ... For example, at first, only one unit was transmitting at a time, so there was no way the Arduino could identify two objects ...

This one is an unusual smart home project, potentially - how to monitor a fish tank’s health with an AI-enabled ultrasonic sensor system. The detailed project is highlighted on Hackser.io and features ...