AnalogInput.ino

/* 
 http://arduino.cc/en/Tutorial/AnalogInput
 */

#define SENSOR_PIN A0    // select the input pin for the potentiometer
#define NUM_PINS 8
#define START_PIN 1

int pin_interval;

void setup() {
  pin_interval = 1024 / NUM_PINS;
  // declare the pins as an OUTPUT:
  for(int i = START_PIN; i <= START_PIN + NUM_PINS; i++) {
    pinMode(i, OUTPUT);
  }
}

void loop() {
  lightSpeed();  
}

void oneLight() {
  // Value between 0 and 1023
  int sensor_value = analogRead(SENSOR_PIN);
  int pin = sensor_value/pin_interval + START_PIN;
  for (int i = START_PIN; i <= START_PIN + NUM_PINS; i++) {
    if (i == pin) {
      digitalWrite(i, HIGH);
    } else {
      digitalWrite(i, LOW);
    }
  }
  delay(10);  
}

void lightBar() {
  // Value between 0 and 1023
  int sensor_value = analogRead(SENSOR_PIN);
  int pin = sensor_value/pin_interval + START_PIN;
  for (int i = START_PIN; i <= START_PIN + NUM_PINS; i++) {
    if (i <= pin) {
      digitalWrite(i, HIGH);
    } else {
      digitalWrite(i, LOW);
    }
  }
  delay(10);
}

int current_pin = START_PIN;
void lightSpeed() {
  int next_pin = ((current_pin - START_PIN + 1) % NUM_PINS) + START_PIN;
  for (int i = START_PIN; i <= START_PIN + NUM_PINS; i++) {
    if (i == next_pin) {
      digitalWrite(i, HIGH);
    } else {
      digitalWrite(i, LOW);
    }
  }
  current_pin = next_pin;
  int sensor_value = analogRead(SENSOR_PIN);
  delay(sensor_value);
}