This is an Arduino-based Proximity Sensor circuit wired using the popular HC-SR04 Ultrasonic ... eye of the red LED when there is no object in the safe-zone (within 5 cm from the HC-SR04 module), and ...

With each contact you make, the red LED lights up ... with only an Arduino UNO, ultrasonic sensor, force-sensitive resistor (or push button), and piezo buzzer. The tone generated depends on ...

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 ...

Enclosed are the ultrasonic sensor, a temperature sensor and an LED indicating the power status. On the other side of the CAT5 cable can be found an Arduino compatible board with an XBee shield ...