WMYCONGCONG 10 PCS HC-SR04 Ultrasonic Distance Measuring Sensor Module for Arduino

Hello, Dejan Nedelkovski here from HowToMechatronics.com. In this tutorial you will learn how to use the HC-SR04 Ultrasonic Sensor. it can measure distance from 2 centimetres up to 4 meters with a raging accuracy up to 3 mm. The working principle of this module is quite simple. It emits an ultra sound at 40,000 Hz which travels through the air and if there is an object or obstacle on it's it will bounce back to the module. Considering the travel time and the speed of the sound you can calculate the distance. The module has 4 pins Ground, VCC, Trig and a Echo The Ground and the VCC pins of the module needs to be connected to the Ground and 5 volts pin on the Arduino Board respectively and Trig and Echo pins to any digital input/output pin on the Arduino Board. In order to generate the ultrasound you'll need to set the Trig on a HIGH state for 10 microseconds. That will send out an 8 cy