Ultrasonic sensor HC-SR04 with ESP8266 (code & circuit explained) | Obstacle Detection, LED/Buzzer

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How to use Ultrasonic sensor HC-SR04 with ESP8266 (code, circuit and working explained) | Obstacle Detection, LED/Buzzer for Beginners.
ESP32 can be used instead of ESP8266. Buzzer can be used instead of LED.

To learn how to set up Arduino IDE for this tutorial, follow the following tutorial:

CHAPTERS:
0:00 Intro
0:43 Understanding HC-SR04
2:45 Code & Explanation
6:38 Circuit & Explanation
11:28 Output and Running Code

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