example added

examples/BH1750autoadjust/BH1750autoadjust.ino

@@ -25,16 +25,16 @@
 
 BH1750 lightMeter;
 
-
 void setup(){
 
-  Serial.begin(9600);
+  Serial.begin(115200);
 
   // Initialize the I2C bus (BH1750 library doesn't do this automatically)
-  Wire.begin();
+  Wire.begin(D2, D1);
   // On esp8266 you can select SCL and SDA pins using Wire.begin(D4, D3);
 
-  lightMeter.begin();
+  lightMeter.begin(BH1750::ONE_TIME_HIGH_RES_MODE);
+  //lightMeter.setMTreg(69);  //not needed, only mentioning it
 
   Serial.println(F("BH1750 Test begin"));
 
@@ -42,11 +42,32 @@ void setup(){
 
 
 void loop() {
-
-  float lux = lightMeter.readLightLevel();
-  Serial.print("Light: ");
+  //we use here the maxWait option due fail save and we want reduced information loss due missing decimal part
+  float lux = lightMeter.readLightLevel(true, true)/100.0;
+  if (lux > 40000.0) {
+    //reduce time slot - needed in direct sun light
+    if(lightMeter.setMTreg(32)) {
+      Serial.println(F("[DEBUG]: MTReg low"));
+      lux = lightMeter.readLightLevel(true, true)/100.0;
+    }
+  }
+  else {
+      if(lux > 10.0 && lightMeter.setMTreg(69)) { 
+        Serial.println(F("[DEBUG]: MTReg default"));
+        lux = lightMeter.readLightLevel(true, true)/100.0;
+      }
+  }
+  if (lux <= 10.0) {
+    //very low light environment
+    if(lightMeter.setMTreg(254)) {
+      Serial.println(F("[DEBUG]: MTReg high"));
+      lux = lightMeter.readLightLevel(true, true)/100.0;
+    }
+  }
+  Serial.print(F("Light: "));
   Serial.print(lux);
-  Serial.println(" lx");
-  delay(1000);
+  Serial.println(F(" lx"));
+  Serial.println(F("--------------------------------------"));
+  delay(5000);
 
 }