Instead, it relies on an ultrasonic distance sensor to detect a hand (or foot) waved in front of the door. An Arduino Leonardo runs the show, sounding a buzzer when the ultrasonic sensor is triggered.

Distance Measurement: Using an ultrasonic sensor (HC-SR04) connected to the ESP32. Real-time Data: Distance data is displayed in real-time on the web page. Web Interface: A hacker-style dark theme web ...

📌 Description The sensor is placed at the top of the water tank. It sends out an ultrasonic pulse and measures the time taken for the echo to return from the water surface. The code then calculates ...

The latter application pushed Tesla to develop new sensors, or new ways to hide the sensors, because CEO Elon Musk didn’t like the idea of a visible sensor in the middle of a door. He said when ...