ArduinoAnalogLab

#define STATUS_LED    13
#define INPUT_PIN     4
#define ANALOG_PIN    A0

void setup() {
  pinMode(INPUT_PIN, INPUT);
  pinMode(STATUS_LED, OUTPUT);
  Serial.begin(9600);
}

int i;
float value, voltage;

void loop() {
  if (digitalRead(INPUT_PIN) == LOW) {
    digitalWrite(STATUS_LED, LOW);
    for (i=0; i<10; i++) {
      value = (float)analogRead(ANALOG_PIN);
      voltage = (value / 1023.0) * 5.0;
      Serial.println(voltage);
      delay(1000);
    }
  }
  digitalWrite(STATUS_LED, HIGH);
}