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/* | |
* Ultrasonic Sensor HC-SR04 and Arduino Tutorial | |
* | |
* by Dejan Nedelkovski, | |
* www.HowToMechatronics.com | |
* | |
*/ | |
// defines pins numbers | |
const int trigPin = 9; | |
const int echoPin = 10; | |
// defines variables | |
long duration; | |
int distance; | |
void setup() { | |
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output | |
pinMode(echoPin, INPUT); // Sets the echoPin as an Input | |
Serial.begin(9600); // Starts the serial communication | |
} | |
void loop() { | |
// Clears the trigPin | |
digitalWrite(trigPin, LOW); | |
delayMicroseconds(2); | |
// Sets the trigPin on HIGH state for 10 micro seconds | |
digitalWrite(trigPin, HIGH); | |
delayMicroseconds(10); | |
digitalWrite(trigPin, LOW); | |
// Reads the echoPin, returns the sound wave travel time in microseconds | |
duration = pulseIn(echoPin, HIGH); | |
// Calculating the distance | |
distance= duration*0.034/2; | |
// Prints the distance on the Serial Monitor | |
Serial.print("Distance: "); | |
Serial.println(distance); | |
} |
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