Licht­sen­sor BH1750

#include "hp_BH1750.h" 

hp_BH1750 BH1750;      
int LED = 7;
int SchwelleDunkelheit = 100;

void setup()
{
  pinMode (LED, OUTPUT);
  Serial.begin(9600);
  delay(1000);

  // Sensor starten
  if (!BH1750.begin(0x23)) 
  {
    Serial.println("BH1750 Sensor nicht gefunden!");
    while(1);
  }
  else Serial.println("BH1750 Sensor gefunden!");
 
  /*
    setQuality
    BH1750_QUALITY_LOW	
    BH1750_QUALITY_HIGH
    BH1750_QUALITY_HIGH2
  */
  BH1750.setQuality(BH1750_QUALITY_HIGH2);
}

void loop()
{
  BH1750.start();  
  float Helligkeit = BH1750.getLux();  
  Serial.println("Helligkeit: " + String(Helligkeit));

  if (Helligkeit < SchwelleDunkelheit) digitalWrite(LED, HIGH);
  else digitalWrite(LED, LOW);
  delay(500);
}