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Learning_to_use_sensor.ino

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+#define trigPin 9
+#define echoPin 10
+
+void setup() {
+  Serial.begin (9600);
+  pinMode(trigPin, OUTPUT);
+  pinMode(echoPin, INPUT);
+}
+
+void loop() {
+  float duration, distance;
+  digitalWrite(trigPin, LOW); 
+  delayMicroseconds(2);
+
+  digitalWrite(trigPin, HIGH);
+  delayMicroseconds(10);
+  digitalWrite(trigPin, LOW);
+
+  duration = pulseIn(echoPin, HIGH);
+  distance = (duration / 2) * 0.0344;
+
+  if (distance >= 400 || distance <= 2){
+    Serial.print("Distance = ");
+    Serial.println("Out of range");
+  }
+  else {
+    Serial.print("Distance = ");
+    Serial.print(distance);
+    Serial.println(" cm");
+    delay(500);
+  }
+  delay(500);
+}