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SONAR/SONAR.ino

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+/*
+ * created by Rui Santos, https://randomnerdtutorials.com
+ * 
+ * Complete Guide for Ultrasonic Sensor HC-SR04
+ *
+    Ultrasonic sensor Pins:
+        VCC: +5VDC
+        Trig : Trigger (INPUT) - Pin10
+        Echo: Echo (OUTPUT) - Pin 11
+        GND: GND
+ */
+ 
+int trigPin = 10;    // Trigger
+int echoPin = 11;    // Echo
+long duration, cm, inches;
+ 
+void setup() {
+  //Serial Port begin
+  Serial.begin (9600);
+  //Define inputs and outputs
+  pinMode(trigPin, OUTPUT);
+  pinMode(echoPin, INPUT);
+}
+ 
+void loop() {
+  // The sensor is triggered by a HIGH pulse of 10 or more microseconds.
+  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
+  digitalWrite(trigPin, LOW);
+  delayMicroseconds(5);
+  digitalWrite(trigPin, HIGH);
+  delayMicroseconds(10);
+  digitalWrite(trigPin, LOW);
+ 
+  // Read the signal from the sensor: a HIGH pulse whose
+  // duration is the time (in microseconds) from the sending
+  // of the ping to the reception of its echo off of an object.
+  pinMode(echoPin, INPUT);
+  duration = pulseIn(echoPin, HIGH);
+ 
+  // Convert the time into a distance
+  cm = (duration/2) / 29.1;     // Divide by 29.1 or multiply by 0.0343
+  inches = (duration/2) / 74;   // Divide by 74 or multiply by 0.0135
+  
+  Serial.print(inches);
+  Serial.print("in, ");
+  Serial.print(cm);
+  Serial.print("cm");
+  Serial.println();
+  
+  delay(250);
+}