Inside [Klaus]’ device is an Arduino Uno, an HC-SR04 ultrasonic distance sensor, and an Adafruit Wave Shield. Originally, this parking/distance sensor used a small TFT to display the distance to ...

This is an Arduino-based Proximity Sensor circuit wired ... The HC-SR04 module includes ultrasonic transmitters, receiver and control circuit. You only need to supply a short pulse to the trigger ...

Here’s a little primer to get you started ... up another Arduino window that has got all the code necessary to use the Distance Sensor. Click on the Upload button and a few LEDs would blink ...