While Example

/*

This code is meant to demonstrate a "while statement"

While the potenitometer is moving, turn an LED

NEEDED:

-Arduino

-Solderless Breadboard

-220 OHM resistor at pin 13

-Long leg (Anode) of LED attached to resistor, short leg attached to ground pin.

-Potentiometer (resistance level doesn't matter), one side connected to ground pin, other side connect to 5volt pin and center pin connected to A0

NOTE: If your Arduino has a built in LED at pin 13, you do not need the LED and resistor.

Created OCT 2013 by

Michael James

http://www.OpenSourceHardwareGroup.com/FlyingNinjaMarsupials

This code is in the public domain

*/

//Pin assignments

int ledPin=13;    //the pin that the led is attached to

int potPin=A0;    //the pin that the potentiometer middle leg is attached to

//variables for tracking the position of the potentiometer

int currentPosition;   //tracks the current position of the Potentiometer

int lastPosition;      // this tracks the last position of the Potentiometer

//Control panel variables - change these to adjust how the sketch performs

int timer=100;     //the duration the LED stays lit when the potentiometer is moved

int tuning=1;      //this adjsuts how much the potentiometer must change inorder to turn on the LED.

                   //if it is too low, the LED might always blink

void setup() {

  //Set the mode of the pins

pinMode(ledPin, OUTPUT);

pinMode(potPin, INPUT);

Serial.begin(9600);

}

void loop() {

      //check the current position of the potentiometer

currentPosition = analogRead(potPin);      

      //check if the potentiometer moved

 while(abs(currentPosition - lastPosition) > tuning) {

        Serial.println(currentPosition);

        digitalWrite(ledPin, HIGH);  //Turn on the LED

         //write 5 volts to ledPin

       delay(timer);  //allow the LED to stay illuminated for this amount of time

       lastPosition = currentPosition; //assign the current position to the previous postion

       currentPosition = analogRead(potPin); //update current position

      }    //close while

        //When the potentiometer is not moving, turn off the LED

           //write 0 volts to ledPin   

  digitalWrite(ledPin, LOW);

}//close loop