diff --git a/software/firmware_module/sketch_sep11a/sketch_sep11a.ino b/software/firmware_module/sketch_sep11a/sketch_sep11a.ino
deleted file mode 100755
index 9b29626..0000000
--- a/software/firmware_module/sketch_sep11a/sketch_sep11a.ino
+++ /dev/null
@@ -1,153 +0,0 @@
-#include <Stepper.h>
-
-
-#define BAUDRATE 115200
-
-#define STEPPERPIN1 11
-#define STEPPERPIN2 10
-#define STEPPERPIN3 9
-#define STEPPERPIN4 8
-#define STEPS 2038 //28BYJ-48 stepper, number of steps
-#define HALLPIN 7 //Pin of hall sensor
-#define AMOUNTFLAPS 45
-
-#define ROTATIONDIRECTION 1 //-1 for reverse direction
-#define OVERHEATINGTIMEOUT 2 //timeout in seconds to avoid overheating of stepper. After starting rotation, the counter will start. Stepper won't move again until timeout is passed
-unsigned long lastRotation = 0;
-
-//globals
-int displayedLetter = 0; //currently shown letter
-int desiredLetter = 0; //letter to be shown
-const String letters[] = {" ", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "Ä", "Ö", "Ü", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", ":", ".", "-", "?", "!"};
-Stepper stepper(STEPS, STEPPERPIN1, STEPPERPIN3, STEPPERPIN2, STEPPERPIN4); //stepper setup
-bool lastInd1 = false; //store last status of phase
-bool lastInd2 = false; //store last status of phase
-bool lastInd3 = false; //store last status of phase
-bool lastInd4 = false; //store last status of phase
-float missedSteps = 0; //cummulate steps <1, to compensate via additional step when reaching >1
-int currentlyrotating = 0; // 1 = drum is currently rotating, 0 = drum is standing still
-int stepperSpeed = 10; //current speed of stepper, value only for first homing
-
-int eeAddress = 0;   //EEPROM address for calibration offset
-int calOffset;       //Offset for calibration in steps, stored in EEPROM, gets read in setup
-int receivedNumber = 0;
-
-
-void setup() {
-  // put your setup code here, to run once:
-  Serial.begin(BAUDRATE);
-  Serial.println("starting unit");
-  stepperSpeed = 17; //until homing is implemented
-}
-
-void loop() {
-  // put your main code here, to run repeatedly:
-  int calLetters[10] = {0, 26, 1, 21, 14, 43, 30, 31, 32, 39};
-  for (int i = 0; i < 10; i++) {
-    int currentCalLetter = calLetters[i];
-    rotateToLetter(currentCalLetter);
-    delay(5000);
-  }
-}
-
-//rotate to letter
-void rotateToLetter(int toLetter) {
-  if (lastRotation == 0 || (millis() - lastRotation > OVERHEATINGTIMEOUT * 1000)) {
-    lastRotation = millis();
-    //get letter position
-    int posLetter = -1;
-    posLetter = toLetter;
-    int posCurrentLetter = -1;
-    posCurrentLetter = displayedLetter;
-    //int amountLetters = sizeof(letters) / sizeof(String);
-#ifdef serial
-    Serial.print("go to letter: ");
-    Serial.println(letters[toLetter]);
-#endif
-    //go to letter, but only if available (>-1)
-    if (posLetter > -1) { //check if letter exists
-      //check if letter is on higher index, then no full rotaion is needed
-      if (posLetter >= posCurrentLetter) {
-#ifdef serial
-        Serial.println("direct");
-#endif
-        //go directly to next letter, get steps from current letter to target letter
-        int diffPosition = posLetter - posCurrentLetter;
-        startMotor();
-        stepper.setSpeed(stepperSpeed);
-        //doing the rotation letterwise
-        for (int i = 0; i < diffPosition; i++) {
-          float preciseStep = (float)STEPS / (float)AMOUNTFLAPS;
-          int roundedStep = (int)preciseStep;
-          missedSteps = missedSteps + ((float)preciseStep - (float)roundedStep);
-          if (missedSteps > 1) {
-            roundedStep = roundedStep + 1;
-            missedSteps--;
-          }
-          stepper.step(ROTATIONDIRECTION * roundedStep);
-        }
-      }
-      else {
-        //full rotation is needed, good time for a calibration
-#ifdef serial
-        Serial.println("full rotation incl. calibration");
-#endif
-        //calibrate(false); //calibrate revolver and do not stop motor
-        //startMotor();
-        stepper.setSpeed(stepperSpeed);
-        for (int i = 0; i < posLetter; i++) {
-          float preciseStep = (float)STEPS / (float)AMOUNTFLAPS;
-          int roundedStep = (int)preciseStep;
-          missedSteps = missedSteps + (float)preciseStep - (float)roundedStep;
-          if (missedSteps > 1) {
-            roundedStep = roundedStep + 1;
-            missedSteps--;
-          }
-          stepper.step(ROTATIONDIRECTION * roundedStep);
-        }
-      }
-      //store new position
-      displayedLetter = toLetter;
-      //rotation is done, stop the motor
-      delay(100); //important to stop rotation before shutting of the motor to avoid rotation after switching off current
-      stopMotor();
-    }
-    else {
-#ifdef serial
-      Serial.println("letter unknown, go to space");
-#endif
-      desiredLetter = 0;
-    }
-  }
-}
-
-//switching off the motor driver
-void stopMotor() {
-  lastInd1 = digitalRead(STEPPERPIN1);
-  lastInd2 = digitalRead(STEPPERPIN2);
-  lastInd3 = digitalRead(STEPPERPIN3);
-  lastInd4 = digitalRead(STEPPERPIN4);
-
-  digitalWrite(STEPPERPIN1, LOW);
-  digitalWrite(STEPPERPIN2, LOW);
-  digitalWrite(STEPPERPIN3, LOW);
-  digitalWrite(STEPPERPIN4, LOW);
-#ifdef serial
-  Serial.println("Motor Stop");
-#endif
-  currentlyrotating = 0; //set active state to not active
-  delay(100);
-}
-
-void startMotor() {
-#ifdef serial
-  Serial.println("Motor Start");
-#endif
-  currentlyrotating = 1; //set active state to active
-  digitalWrite(STEPPERPIN1, lastInd1);
-  digitalWrite(STEPPERPIN2, lastInd2);
-  digitalWrite(STEPPERPIN3, lastInd3);
-  digitalWrite(STEPPERPIN4, lastInd4);
-}
-
-