HC-SR04 is an ultrasonic sensor which works on the principle of ultrasonic waves. Basically it creates a pulse depending on the distance from the sensor. It has two eyes like structure one of which transmits the waves and the other acts as receiver. The sensor has 4 pins VCC, TRIG, ECHO, GND. When the sensor is triggered by sending a pulse to TRIG pin, it sends a pulse through ECHO pin which can be measured. 1. Parts needed: Arduino, wires, Ultrasonic Sensor (HC-SR04). 2. Connections: VCC pin to Arduino 5V TRIG pin to Arduino pin 11 ECHO pin to Arduino pin 12 GND pin to Arduino GND 3. Code: void setup () { Serial.begin( 9600 ); //Sensor TRIG pin to pin 11 pinMode( 11 , OUTPUT); //Sensor ECHO pin to pin 12 pinMode( 12 , INPUT); } void loop () { int duration, distance; //to send trigger pin to pin 11 by activating it ...
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