How to Use the HC-SR04 Ultrasonic Sensor With the Arduino UNO

In this tutorial you will learn how to use the HC-SR04 Ultrasonic Sensor with the Arduino UNO R3.

You will need:

• 1x Computer with Arduino IDE installed
• 1x Arduino UNO R3 or clone
• 1x USB Cable
• 1x Breadboard
• 1x HC-SR04 Ultrasonic Sensor
• 4x Male to Male Jumper Wires

Place the ultrasonic sensor on the breadboard like in the picture.

Connect the first jumper wire to the ground on the sensor and to the ground on the Arduino.

Connect the second jumper wire to the echo pin on the sensor and to pin number 10 on the Arduino.

Connect the third jumper wire to the trigger (TRIG) pin on the sensor and to pin number 9 on the Arduino.

Connect the fourth jumper wire to the VCC pin on the sensor and to the 5V pin on the Arduino.

Connect the USB cable with one end to the Arduino and the other end to the computer.

Download and open the Arduino sketch, you can download it at the beginning of this page.

Then open it with the Arduino IDE.

Click the upload button to upload the sketch to the Arduino.

After a few seconds the upload should be complete.

Click the button in the top-right corner of the Arduino IDE to open the Serial Monitor.

Here you can see communications between the Arduino and the computer.

You should see the distance the ultrasonic sensor is measuring in centimeter.

Congratulations on completing this tutorial!