5 LEDs über einen Lichtsensor ansteuern

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Quick & dirty, geht aber auch eleganter:

void setup (){
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
}

void loop(){
  if (analogRead(A1)>200) digitalWrite (7, HIGH);
    else digitalWrite (7, LOW);
  if (analogRead(A1)>400) digitalWrite (8, HIGH);
    else digitalWrite (8, LOW);
  if (analogRead(A1)>600) digitalWrite (9, HIGH);
    else digitalWrite (9, LOW);
  if (analogRead(A1)>800) digitalWrite (10, HIGH);
    else digitalWrite (10, LOW);
  if (analogRead(A1)>1000) digitalWrite (11, HIGH);
    else digitalWrite (11, LOW);
}