diff --git a/light.ino b/light.ino
new file mode 100644
index 0000000..ee0d8fa
--- /dev/null
+++ b/light.ino
@@ -0,0 +1,113 @@
+#define Light_sensor A0
+#define Lamp_mod 6
+#define Move_sensor 2
+
+// Gemessene Sensorwete des Helligkeitssensors
+
+// max 630 in 01
+// min 58 in 01
+
+// max 995  in  03
+// max 19  in  03
+uint8_t sensoflight(uint8_t lpin){
+  uint16_t light = map(analogRead(lpin), 58, 630, 0, 100);   
+return light;
+}
+
+
+uint8_t led_pwr;
+
+// maximale dauer der funktion less  than 860 * 10^-6 s
+/*
+tested with: 
+ unsigned long time_stp;
+ unsigned long time_fin; 
+ setlamp(Lamp_mod, 0); 
+ time_stp = micros();
+ setlamp(Lamp_mod, 100);
+ time_fin = micros();
+ unsigned long need = time_fin - time_stp;  
+ Serial.println (need); 
+ delay(1000); 
+ */
+
+void setlamp(uint8_t lpin,  uint8_t lbrightness){
+  lbrightness = lbrightness%101;
+  uint8_t n_led_pwr = map(lbrightness, 0, 100, 0, 255); 
+  
+  int16_t led_lamp = led_pwr - n_led_pwr; 
+  while (led_lamp != 0) {
+    if (led_lamp < 0){ 
+       led_pwr ++; 
+    }
+     if (led_lamp > 0){
+       led_pwr --;
+    }
+    delayMicroseconds(10);
+    analogWrite(lpin, led_pwr); 
+    led_lamp = led_pwr - n_led_pwr; 
+  } 
+}
+
+uint8_t movement_threshold;
+
+void movement(){
+  if ((movement_threshold>=80)&&(movement_threshold+5<100)){
+     movement_threshold += 5;  
+  }
+  else{
+   movement_threshold = 80; 
+  }  
+}
+
+void setup() {
+  pinMode(Move_sensor,INPUT);
+  attachInterrupt(digitalPinToInterrupt(Move_sensor), movement, RISING);
+  pinMode(Light_sensor,INPUT);
+  pinMode(Lamp_mod,OUTPUT); 
+  Serial.begin(9600);
+}
+
+// functions werte definiert von 0 bis 100 darüber und unter chaos!
+void setlight_with_wehtherinfluence(int8_t f_light){
+
+  // 0 - 100  limit. 
+  f_light = (f_light % 101);
+
+  // aretmetics over 100  scans! 
+  uint16_t env_light = 0;
+  for (int i=0; i <100; i++){
+    env_light += sensoflight(Light_sensor);
+    delayMicroseconds(10);
+  }
+  env_light = (env_light/100);
+
+  // aretmetic light of enviroment 
+  int8_t setlight = f_light - env_light; 
+  
+  if (setlight > 100) setlamp(Lamp_mod,100); // would still never heppen but if lamps won't flicker.
+  if (setlight > 0) setlamp(Lamp_mod,setlight);
+  else setlamp(Lamp_mod,0);
+}
+
+int maxwert; 
+void loop() {
+ /*setlight_with_wehtherinfluence(30);
+ delay(1000);
+ setlight_with_wehtherinfluence(80);
+ delay(1000);
+ */
+ /*
+ int test = analogRead(Light_sensor); 
+  if (test > maxwert) maxwert = test;   
+ Serial.println(maxwert);
+ */
+ // testcode for precentage 
+ //Serial.println(sensoflight(Light_sensor));
+  
+  Serial.println(movement_threshold);
+  if (movement_threshold) movement_threshold--; // time based light reduction!
+  setlight_with_wehtherinfluence(movement_threshold); 
+  delay(100);
+  
+}
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