diff --git a/lib/treppe/treppe.cpp b/lib/treppe/treppe.cpp
index f001e40..6fe8f0e 100644
--- a/lib/treppe/treppe.cpp
+++ b/lib/treppe/treppe.cpp
@@ -64,10 +64,10 @@ void Treppe::start_animation( dimmer_t* dimmer, bool dim_type,
     else
       dimmer->stufe = stufen - 1;
 
-    dimmer->ticks = time_per_stair / INT_TIME; // [ms]
+    dimmer->ticks = parameters.time_per_stair / INT_TIME; // [ms]
   } 
   else { // DIM_LDR
-    dimmer->ticks = time_ldr / INT_TIME; // [ms]
+    dimmer->ticks = parameters.time_ldr / INT_TIME; // [ms]
   }
 
   if (fsm_outputs.dimmrichtung == DR_AUFDIMMEN)
@@ -203,10 +203,10 @@ bool Treppe::check_ldr()
   // follow up: averaging over many samples?
   float ldr = read_ldr();
 
-  if (ldr < ldr_schwelle) {
+  if (ldr < parameters.ldr_schwelle) {
     active = 1;
   }
-  if (ldr > ldr_schwelle + LDR_HYS) {
+  if (ldr > parameters.ldr_schwelle + LDR_HYS) {
     active = 0;
   }
   return active;
@@ -260,7 +260,7 @@ void Treppe::task()
       fsm_outputs.status == ST_ABDIMMEN_RUNTER )
   {
     if(fsm_pend.anim_beendet)
-      start_animation(&dimmer_stufen, DIM_STUFEN, active_pwm, idle_pwm_ist);
+      start_animation(&dimmer_stufen, DIM_STUFEN, parameters.active_pwm, idle_pwm_ist);
     else
       fsm_pend.anim_beendet = dimmer_tick(&dimmer_stufen, DIM_STUFEN);
   }
@@ -319,14 +319,16 @@ void Treppe::setup()
 
 void Treppe::set_idle_prozent(const int prozent) 
 {
-  uint16_t new_pwm = active_pwm * prozent / 100;
+  // future use: parameters.idle_max_pwm
+  uint16_t new_pwm = parameters.active_pwm * prozent / 100;
   set_idle_pwm_max(new_pwm);
 }
 
 void Treppe::set_idle_pwm_max(const uint16_t new_pwm)
 {
-  if(new_pwm > active_pwm) {
-    idle_pwm_soll = active_pwm;
+  // future use: parameters.idle_max_pwm
+  if(new_pwm > parameters.active_pwm) {
+    idle_pwm_soll = parameters.active_pwm;
   } else {
     idle_pwm_soll = new_pwm;
   }
@@ -337,11 +339,11 @@ void Treppe::set_idle_pwm_max(const uint16_t new_pwm)
 
 void Treppe::set_active_pwm(uint16_t _active_pwm)
 {
-  active_pwm = _active_pwm;
-  Serial.printf("Treppe: active_pwm=%d\n", active_pwm);
+  parameters.active_pwm = _active_pwm;
+  Serial.printf("Treppe: active_pwm=%d\n", parameters.active_pwm);
 }
 void Treppe::set_time_per_stair(uint16_t _time_per_stair)
 {
-  time_per_stair = _time_per_stair;
-  Serial.printf("Treppe: time_per_stair=%d\n", time_per_stair);
+  parameters.time_per_stair = _time_per_stair;
+  Serial.printf("Treppe: time_per_stair=%d\n", parameters.time_per_stair);
 }
\ No newline at end of file
diff --git a/lib/treppe/treppe.h b/lib/treppe/treppe.h
index f9ab0c2..a303ec2 100644
--- a/lib/treppe/treppe.h
+++ b/lib/treppe/treppe.h
@@ -16,14 +16,19 @@
 class Treppe {
 private:
     const uint8_t stufen;
-    const uint16_t time_ldr = 500;
-    uint16_t time_per_stair = 300;  // dimmtime per stair [ms]
-    uint16_t idle_pwm_max = 100;
-    uint16_t idle_pwm_ist = idle_pwm_max;
-    uint16_t idle_pwm_soll = 0;
-    uint16_t active_pwm = 2000;
 
-    uint16_t ldr_schwelle = 2;      // activation value for FSM [lx]
+    struct stairway_param_t {
+        uint16_t time_ldr = 500;
+        uint16_t time_per_stair = 300;  // dimmtime per stair [ms]
+        uint16_t idle_pwm_max = 100;
+        uint16_t active_pwm = 2000;
+        uint16_t ldr_schwelle = 2;      // activation value for FSM [lx]
+    };
+    stairway_param_t parameters;
+
+    uint16_t idle_pwm_ist = parameters.idle_pwm_max;
+    uint16_t idle_pwm_soll = 0;
+    
     struct fsm_pending_inputs_t {
         bool anim_beendet = true;
         bool sensor_unten = false;