int sensor = 6;
int redled = 7;

void setup() {
  pinMode(sensor, INPUT);
  pinMode(redled, OUTPUT);
  Serial.begin(9600);
}
void loop() {

  int ambientLight = digitalRead(sensor);
  Serial.print("Ambient Light : ");
  Serial.println(ambientLight);

  if (ambientLight == HIGH) {
    digitalWrite(redled, HIGH);
  } 
  else {
    digitalWrite(redled, LOW);
  }
}