/*
  ReadAnalogVoltage
  Reads an analog input on pin 0, converts it to voltage, and prints the result to the serial monitor.
  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.
 
 This example code is in the public domain.
 */
int led9 = 9;
int led10 = 10;
int led11 = 11;
int led13 = 13;

int counter;
// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600); 
  pinMode(led9, OUTPUT);     
  pinMode(led10, OUTPUT);     
  pinMode(led11, OUTPUT);     
  pinMode(led13, OUTPUT); 
  digitalWrite (led13, HIGH);
  delay(500);
  digitalWrite(led13, LOW);
  delay(500);
  digitalWrite(led13, HIGH);
  delay(500);
  digitalWrite(led13, LOW);
  delay(500);
  digitalWrite(led13, HIGH);
  delay(500);
  digitalWrite(led13, LOW);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  float voltage = sensorValue * (5.0 / 1023.0);
  // print out the value you read:
  //Serial.println(voltage);
  //delay(300);
  if (voltage > 2.4){
    lightshow();
  }
  else {
    standby();
  }
}

void lightshow(){
  for (counter = 0; counter < 10; counter++){
    digitalWrite (led9, HIGH);
    delay(200);
    digitalWrite(led9, LOW);
    delay(100);
    digitalWrite(led10, HIGH);
    delay(200);
    digitalWrite(led10, LOW);
    delay(100);
    digitalWrite(led11, HIGH);
    delay(200);
    digitalWrite(led11, LOW);
    delay(100);
  }
}

void standby(){
  digitalWrite(led9, LOW);
  digitalWrite(led10, LOW);
  digitalWrite(led11, LOW);
  digitalWrite(led13, LOW);
}