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build/shared/examples/06.Sensors/Knock/Knock.ino

@@ -1,26 +1,26 @@
 /* Knock Sensor
-  
-   This sketch reads a piezo element to detect a knocking sound. 
-   It reads an analog pin and compares the result to a set threshold. 
+
+   This sketch reads a piezo element to detect a knocking sound.
+   It reads an analog pin and compares the result to a set threshold.
    If the result is greater than the threshold, it writes
    "knock" to the serial port, and toggles the LED on pin 13.
-  
+
    The circuit:
 	* + connection of the piezo attached to analog in 0
 	* - connection of the piezo attached to ground
 	* 1-megohm resistor attached from analog in 0 to ground
 
    http://www.arduino.cc/en/Tutorial/Knock
-   
+
    created 25 Mar 2007
    by David Cuartielles <http://www.0j0.org>
    modified 30 Aug 2011
    by Tom Igoe
-   
+
    This example code is in the public domain.
 
  */
- 
+
 
 // these constants won't change:
 const int ledPin = 13;      // led connected to digital pin 13
@@ -33,22 +33,22 @@ int sensorReading = 0;      // variable to store the value read from the sensor
 int ledState = LOW;         // variable used to store the last LED status, to toggle the light
 
 void setup() {
- pinMode(ledPin, OUTPUT); // declare the ledPin as as OUTPUT
- Serial.begin(9600);       // use the serial port
+  pinMode(ledPin, OUTPUT); // declare the ledPin as as OUTPUT
+  Serial.begin(9600);       // use the serial port
 }
 
 void loop() {
   // read the sensor and store it in the variable sensorReading:
-  sensorReading = analogRead(knockSensor);    
-  
+  sensorReading = analogRead(knockSensor);
+
   // if the sensor reading is greater than the threshold:
   if (sensorReading >= threshold) {
     // toggle the status of the ledPin:
-    ledState = !ledState;   
-    // update the LED pin itself:        
+    ledState = !ledState;
+    // update the LED pin itself:
     digitalWrite(ledPin, ledState);
     // send the string "Knock!" back to the computer, followed by newline
-    Serial.println("Knock!");         
+    Serial.println("Knock!");
   }
   delay(100);  // delay to avoid overloading the serial port buffer
 }