/*
 Voltaat learn (https://www.voltaat.com)
 Link for full tutorial:

 Tutorial: Measuring distance using the ultrasonic sensor

 This is an Arduino sketch that uses an ultrasonic sensor to compute the distance from an object

 Connections from the Arduino to the ultrasonic sensor:
 • Arduino VCC pin → ultrasonic sensor VCC pin (+ pin)
 • Arduino pin 11 → ultrasonic sensor Trig pin
 • Arduino pin 11 → ultrasonic sensor Echo pin
 • Arduino GND pin → ultrasonic sensor GND pin (- pin)

*/

//Define pin numbers
#define trig 11
#define echo 12
//Defines variables and initialize their values
int distance = 0, t = 0;

//Commands inside void setup run once
void setup() {
 //Start the serial monitor at 9600 baud rate (9600 bits per second)
 Serial.begin(9600);
 //Sets the trig Pin as an output
 pinMode(trig, OUTPUT);
 //Sets the echo Pin as an intput
 pinMode(echo, INPUT);

}

//Commands inside void loop run forever
void loop() {
 //Clears the trig pin
 digitalWrite(trig, LOW);
 //delay for 5 micro seconds
 delayMicroseconds(5);
 //Sets the trig Pin HIGH for 10 micro seconds
 digitalWrite(trig, HIGH);
 delayMicroseconds(10);
 digitalWrite(trig, LOW);
 //Reads the echoPin, returns the sound wave travel time in microseconds
 t = pulseIn(echo, HIGH);
 //Calculating the distance
 distance = (t / 57);
 //Print to serial monitor
 Serial.print("Distance=  ");
 Serial.print(distance);
 Serial.println(" Cm");
 delay(1000);
}