Ultrasonic Sensor Module HC-SR-04 or compatible

This Ultrasonic Sensor module is a transmitter, a receiver and a control circuit in one single pack. It offers excellent range accuracy and stable readings in an easy-to-use package. It’s operation is not affected by sunlight or black material like Sharp rangefinders are (although acoustically soft materials like cloth can be difficult to detect).

The Trigger and the Echo pins are the I/O pins of this module and hence they can be connected to the I/O pins of the microcontroller/Arduino.