// 
// COLOR - ANALOG
// BLACK LINE
// READINGS DEPENDS ON COLOR AND LIGHT
//
int led1 = 4; // led 1 GREEN
int sen1 = A0; // COLOR
int pw = 13; // sensor power

void setup() {
  Serial.begin(9600);                
  pinMode(led1, OUTPUT); 
  pinMode(pw, OUTPUT);  
  pinMode(sen1, INPUT); 
  digitalWrite(led1, LOW);   
  digitalWrite(pw, HIGH);  
}

void loop() {
  Serial.println(String(analogRead(sen1))); 
  if (analogRead(sen1) > 800) // BLACK LINE
  {  
  digitalWrite(led1, LOW);
  }
  else
  {
  digitalWrite(led1, HIGH);
  }  
}