This article is included in the ISTEM 2023 Series
- Review – Arduino Libraries Information Page


- In the Arduino IDE Library Manager, enter HC-SR04 into the search box.
- Find and Install the HC-SR04 library by Dirk Sarodnick.

- Open the HC-SR04 Simple example code.



- Modify the code so the triggerPin is set to 11.
- Check and Upload the code to the Arduino Nano.


- Open the Serial Monitor.
- Notice that the distance varies as you move your hand closer and away from the sensor.
Code Challenge!: My ruler is in inches, modify the code to display inches instead of centimeters.

- Verify operation using the Serial Monitor.