The set-up process is very simple, and best understood by referring the wiring diagram. If everything goes right,you should see the burning eye of the red LED when there is no object in the safe-zone ...

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.

Obstacle detection is key to achieving this requirement. A robot must detect or “see” obstacles from a few feet to a few centimeters away to avoid collisions – and in a timely fashion. Ultrasonic ...

ESP32-Cam Makes A Dandy Motion Detector. 7 Comments . by: Al ... we’ve used IR and ultrasonic sensors but ... [Eloquent Arduino]. The algorithm is pretty simple.