#include <Wire.h>

#define ledPin 5
#define movementPin A0  // mindestens 3 V liefert
#define S1 10           // Schalter


#define SENSOR_ADR 0x23

float Get_B()
{
  byte msb;
  byte lsb;
  float lux;

  // Pointer-Byte senden
  Wire.beginTransmission(SENSOR_ADR);
  Wire.write(0x23);
  Wire.endTransmission();

  delay(200);

 
  Wire.requestFrom(SENSOR_ADR, 2); // erwartet 2 bytes 

  msb = Wire.read();//liest ein BYTE
  lsb = Wire.read();//liest ein BYTE

  // Lux berechnen
  lux = (msb * 256 + lsb) / 1.2;

  return lux;
}

void setup()
{
  Serial.begin(9600);
  Wire.begin();
  pinMode(S1, INPUT_PULLUP);  
  pinMode(ledPin, OUTPUT);
}

void loop()
{
  float B = Get_B();
  Serial.print("Beleuchtungsstaerke: ");
  Serial.print(B);
  Serial.print(" lx");
  delay(500);

  if (digitalRead(S1) == LOW)   // HIGH
  {
    if (B <= 300)
    {
      digitalWrite(ledPin, HIGH);
    }
  }
  else if (digitalRead(S1) == HIGH)   // LOW
  {
    if ((B > 300) && ())
    {
      analogWrite(movementPin, HIGH);
      delay(60000);    // delay is hierbei zullaesig
    }
  }








}