Discover how to use the HC-SR04 ultrasonic sensor with the Arduino UNO R4. Understand how the ultrasonic sensor works, how to connect it to the Arduino UNO R4, and how to write and program the code for it. We provide detailed instructions, coding examples, wiring schematics, video guides, and explanations of each code line to assist you in beginning with the Arduino UNO R4 promptly. Access this tutorial and more on Newbiely.com.