diff --git a/main/config.h b/main/config.h
index 607d538..ca0369f 100644
--- a/main/config.h
+++ b/main/config.h
@@ -108,16 +108,18 @@
 //enable mode  encoder test for calibration (determine ENCODER_STEPS_PER_METER)
 //if defined, displays always show length and steps instead of the normal messages
 //#define ENCODER_TEST
+//TODO: add way to calibrate without flashing -> enter calibration mode with certain button sequence, enter steps-per-meter with poti, store in nvs
 
 //steps per meter
 //this value is determined experimentally while ENCODER_TEST is enabled
-#define ENCODER_STEPS_PER_METER 2127 //roll-v3-gummi-86.6mm - d=89.8mm
+//#define ENCODER_STEPS_PER_METER 2127 //until 2024.03.13 roll-v3-gummi-86.6mm - d=89.8mm
+#define ENCODER_STEPS_PER_METER 2118 //2024.03.13 roll-v3-gummi measured 86.5mm
 
-//millimetres added to target length
+//millimeters added to target length
 //to ensure that length does not fall short when spool slightly rotates back after stop
 #define TARGET_LENGTH_OFFSET 0
 
-//millimetres lengthNow can be below lengthTarget to still stay in target_reached state
+//millimeters lengthNow can be below lengthTarget to still stay in target_reached state
 #define TARGET_REACHED_TOLERANCE 5
 
 
diff --git a/main/control.cpp b/main/control.cpp
index b203af9..2fcdc3e 100644
--- a/main/control.cpp
+++ b/main/control.cpp
@@ -446,17 +446,21 @@ void task_control(void *pvParameter)
         displayTop.handle();
         displayBot.handle();
         //-- show encoder steps on display1 ---
-        sprintf(buf_disp1, "EN %05d", encoder_getSteps); //count
+        sprintf(buf_disp1, "EN %05d", encoder_getSteps()); //count
         displayTop.showString(buf_disp1);
         //--- show converted distance on display2 ---
         sprintf(buf_disp2, "Met %5.3f", (float)lengthNow/1000); //m
         displayBot.showString(buf_disp2);
-        //--- beep every 1m ---
-        //note: only works precicely in forward/positive direction
-        if (lengthNow % 1000 < 50) { //with tolerance in case of missed exact value
-            if (fabs(lengthNow - lengthBeeped) >= 900) { //dont beep multiple times at same meter
-                //TODO: add case for reverse direction. currently beeps 0.1 too early
-                buzzer.beep(1, 400, 100 );
+        //--- beep every 0.5m ---
+        //note: only works precisely in forward/positive direction, in reverse it it beeps by tolerance too early
+        static int lengthBeeped = 0;
+        if (lengthNow % 500 < 50) { //with tolerance in case of missed exact value
+            if (fabs(lengthNow - lengthBeeped) >= 400) { //dont beep multiple times at same distance
+                //TODO: add case for reverse direction. currently beeps 50mm too early
+                if (lengthNow % 1000 < 50) // 1m beep
+                    buzzer.beep(1, 400, 100);
+                else // 0.5m beep
+                    buzzer.beep(1, 200, 100);
                 lengthBeeped = lengthNow;
             }
         }
diff --git a/main/shutdown.hpp b/main/shutdown.hpp
index b3620fc..eb49014 100644
--- a/main/shutdown.hpp
+++ b/main/shutdown.hpp
@@ -1,4 +1,5 @@
 
+// task that repeatedly checks supply voltage (12V) and saves certain values to nvs in case of it drops below a certain threshold (power off detected)
 void task_shutDownDetection(void *pvParameter);
 
 // read last axis position in steps from nvs