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55 lines
1.1 KiB
55 lines
1.1 KiB
/*
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* Ultrasonic Sensor HC-SR04 and Arduino Tutorial
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*
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* by Dejan Nedelkovski,
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* www.HowToMechatronics.com
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*
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*/
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// defines pins numbers
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const int trigPin = 9;
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const int echoPin = 10;
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const int response = 6;
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// defines variables
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long duration;
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int distance;
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void setup() {
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pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
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pinMode(response, OUTPUT);
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pinMode(echoPin, INPUT); // Sets the echoPin as an Input
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Serial.begin(9600); // Starts the serial communication
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// Clears the trigPin
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digitalWrite(trigPin, LOW);
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delayMicroseconds(2);
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}
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void loop() {
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// Sets the trigPin on HIGH state for 10 micro seconds
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digitalWrite(trigPin, HIGH);
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delayMicroseconds(10);
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digitalWrite(trigPin, LOW);
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// Reads the echoPin, returns the sound wave travel time in microseconds
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duration = pulseIn(echoPin, HIGH);
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// Calculating the distance
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distance= duration*0.034/2;
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// Prints the distance on the Serial Monitor
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//Serial.print("Distance: ");
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//Serial.println(distance);
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if (distance < 5){
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Serial.println("0");
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digitalWrite(response, LOW);
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}
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else{
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Serial.println("1");
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digitalWrite(response, HIGH);
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}
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delay(500);
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}
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