Description:   In this Arduino Tutorial we will learn how the HC-SR04 Ultrasonic Sensor works and how to use it with Buzzer and LED.   Hardware Required:   - Arduino Board  - Ultrasonic Sensor HC-SR04  - Buzzer  - LED  - Breadboard and Jump Wires   Connections:   HC-SR04 Sensor   - The HC-SR04 Ultrasonic Module has 4 pins, Ground, VCC, Trig and Echo. The Ground and the VCC pins of the module needs to be connected to the Ground and the 5 volts pins on the Arduino Board respectively and the trig and echo pins to any Digital I/O pin on the Arduino Board.  - The HC-SR04 sensor attach to the Breadboard  - The Sensor VCC connect to the Arduino Board +5V  - The Sensor GND connect to the Arduino Board GND  - The Sensor Trig connect to the Arduino Board ANALOG 1  - The Sensor Echo connect to the Arduino Board ANALOG 0     LED  - The LED attach to the Arduino UNO  - The LED (from LED's long leg) connect to the Arduino Board Digital 13  - The LED short leg (-) connect to the Arduino Board G...
 
 
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