build/shared/dist/examples/Analog/AnalogInput/AnalogInput.pde

@@ -1,27 +1,48 @@
 /*
- * AnalogInput
- * by DojoDave <http://www.0j0.org>
- *
- * Turns on and off a light emitting diode(LED) connected to digital  
- * pin 13. The amount of time the LED will be on and off depends on
- * the value obtained by analogRead(). In the easiest case we connect
- * a potentiometer to analog pin 2.
- *
- * http://www.arduino.cc/en/Tutorial/AnalogInput
+  Analog Input
+ Demonstrates analog input by reading an analog sensor on analog pin 0 and
+ turning on and off a light emitting diode(LED)  connected to digital pin 13. 
+ The amount of time the LED will be on and off depends on
+ the value obtained by analogRead(). 
+ 
+ The circuit:
+ * Potentiometer attached to analog input 0
+ * center pin of the potentiometer to the analog pin
+ * one side pin (either one) to ground
+ * the other side pin to +5V
+ * LED anode (long leg) attached to digital output 13
+ * LED cathode (short leg) attached to ground
+ 
+ * Note: because most Arduinos have a built-in LED attached 
+ to pin 13 on the board, the LED is optional.
+ 
+ 
+ Created by David Cuartielles
+ Modified 16 Jun 2009
+ By Tom Igoe
+ 
+ http://arduino.cc/en/Tutorial/AnalogInput
+ 
  */
 
-int potPin = 2;    // select the input pin for the potentiometer
-int ledPin = 13;   // select the pin for the LED
-int val = 0;       // variable to store the value coming from the sensor
+int sensorPin = 0;    // select the input pin for the potentiometer
+int ledPin = 13;      // select the pin for the LED
+int sensorValue = 0;  // variable to store the value coming from the sensor
 
 void setup() {
-  pinMode(ledPin, OUTPUT);  // declare the ledPin as an OUTPUT
+  // declare the ledPin as an OUTPUT:
+  pinMode(ledPin, OUTPUT);  
 }
 
 void loop() {
-  val = analogRead(potPin);    // read the value from the sensor
-  digitalWrite(ledPin, HIGH);  // turn the ledPin on
-  delay(val);                  // stop the program for some time
-  digitalWrite(ledPin, LOW);   // turn the ledPin off
-  delay(val);                  // stop the program for some time
-}
+  // read the value from the sensor:
+  sensorValue = analogRead(sensorPin);    
+  // turn the ledPin on
+  digitalWrite(ledPin, HIGH);  
+  // stop the program for <sensorValue> milliseconds:
+  delay(sensorValue);          
+  // turn the ledPin off:        
+  digitalWrite(ledPin, LOW);   
+  // stop the program for for <sensorValue> milliseconds:
+  delay(sensorValue);                  
+}