//#define LEDPin 13 #define trigPin 8 #define echoPin 9 int maximumRange = 400; int minimumRange = 0; long duration, distance; void setup() { Serial.begin (115200); pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); } void loop() { digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); //Calculate distance based on speed of sound distance = duration/58.2; if (distance > 80) { Serial.println("Out of range"); } else { Serial.print(distance), Serial.println(" cm"); } delay(30); }