//http://arduino.cc/en/Tutorial/AnalogInput
int sensorPin = A0; // select the input pin for the potentiometer
int ledPin1 = 13; // select the pin for the LED
int ledPin2 = 12; // select the pin for the LED
int sensorValue = 0; // variable to store the value coming from the sensor
void setup() {
// declare the ledPin as an OUTPUT:
pinMode(ledPin1, OUTPUT);
pinMode(ledPin2, OUTPUT);
}
void loop() {
// read the value from the sensor:
sensorValue = analogRead(sensorPin);
// turn the ledPin on
digitalWrite(ledPin1, HIGH);
digitalWrite(ledPin2, LOW);
// stop the program for <sensorValue> milliseconds:
delay(sensorValue);
// turn the ledPin off:
digitalWrite(ledPin1, LOW);
digitalWrite(ledPin2, HIGH);
// stop the program for for <sensorValue> milliseconds:
delay(sensorValue);
}