int photo = A0;
int led = 2;
int but = 3;
bool automode;
bool manualmode = false;
void setup() {
  pinMode(photo, INPUT);
  pinMode(but, INPUT_PULLUP);
  pinMode(led, OUTPUT);
}

void loop() {
  if (!digitalRead(but)) {
    delay(50);
    if (!digitalRead(but)) {
      automode = !automode;
      manualmode = !manualmode;
      while (!digitalRead(but)) {
        delay(50);
      }
    }
    if (automode) {
      int level = analogRead(photo);
      if (level > 200) {
        digitalWrite(led, HIGH);
      }
      else {
        digitalWrite(led, LOW0);
      }
    }
    else {
      digitalWrite(led, LOW);
    }
  }

}