This is an Arduino-based Proximity Sensor circuit wired using the popular HC ... If everything goes right,you should see the burning eye of the red LED when there is no object in the safe-zone (within ...

Patrick explains a little more about the new Arduino ultrasonic experiment kit and its functionality : This bad boy can be re-programmed with your own code, and the included code samples can be ...

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.