How to measure distance using Ultrasonic HCSR04 & ESP8266 Node MCU

How to measure distance using Ultrasonic HCSR04 & ESP8266 Node MCU

We will learn about HC-SR04  widely known as Ultrasonic Sensor, how it works, and how to interface with the NodeMCU. And also how to measure distance using ultrasonic sensor & ESP8266. Before building the circuit let me explain what is an HC-SR04 Ultrasonic sensor?? As the name indicates, ultrasonic sensors measure distance by using ultrasonic waves. … Read more