diff --git a/data/index.html b/data/index.html
index 7d87641..d195f18 100644
--- a/data/index.html
+++ b/data/index.html
@@ -51,7 +51,7 @@
   <div class="param_block">
     LDR Schwelle [lx]: <output id="out_ldr_shw" class="val_range">50</output> lx
     <div class="slider">
-      <input type="range" class="regler" id="range_ldr_shw" data-output="out_ldr_shw" min="0" max="100" value="50">
+      <input type="range" class="regler" id="range_ldr_shw" data-output="out_ldr_shw" min="0" max="1000" value="50">
     </div>
   </div>
 
diff --git a/lib/treppe/treppe.cpp b/lib/treppe/treppe.cpp
index 44b6a98..c9ff47a 100644
--- a/lib/treppe/treppe.cpp
+++ b/lib/treppe/treppe.cpp
@@ -173,11 +173,15 @@ float Treppe::read_ldr() {
   ldr_value = E(LDR)
   */
   // float ldr_ohm = 37280.00 / analogRead(A0);
-  float voltage = analogRead(A0) * 0.0036;
-  float ldr_ohm = 40.57 * (3.3 - voltage) / voltage;
+  float vol_adc = analogRead(A0) * 0.0036;
+  if(vol_adc > 3.29)
+    vol_adc = 3.29;
+
+  float ldr_ohm = 40.67 * (3.3 - vol_adc) / vol_adc;
+
   float ldr_value = 6526.6 / (ldr_ohm * ldr_ohm);
 #ifdef LDRDEBUG
-  Serial.printf("Ohm: %f lux: %f Comp: %d\n", ldr_ohm, ldr_value,
+  Serial.printf("vol_adc: %f Ohm: %f lux: %f Comp: %d\n", vol_adc, ldr_ohm, ldr_value,
                 param.ldr_schwelle);
 #endif
   return ldr_value;
@@ -186,10 +190,6 @@ float Treppe::read_ldr() {
 bool Treppe::check_ldr() {
   static uint8_t active = 0;
 
-#ifdef LDRDEBUG
-  // return true;
-#endif
-
   // follow up: averaging over many samples?
   float ldr = read_ldr();
 
diff --git a/lib/treppe/treppe.h b/lib/treppe/treppe.h
index 8752c5a..a70bde3 100644
--- a/lib/treppe/treppe.h
+++ b/lib/treppe/treppe.h
@@ -5,8 +5,8 @@
 #include "PCA9685.h"
 #include <EEPROM.h>
 
-//#define LDRDEBUG  // comment in to override LDR measurement
-#define LDR_HYS 8 // Hysteresis for switching off FSM [lux]
+#define LDRDEBUG  // comment in to override LDR measurement
+#define LDR_HYS 100 // Hysteresis for switching off FSM [lux]
 
 #define SENSOR_OBEN 16
 #define SENSOR_UNTEN 12