diff --git a/ADIS_tinyK22_SplitFlap/source/application.c b/ADIS_tinyK22_SplitFlap/source/application.c
index 8b11fef..ba04c78 100644
--- a/ADIS_tinyK22_SplitFlap/source/application.c
+++ b/ADIS_tinyK22_SplitFlap/source/application.c
@@ -23,10 +23,12 @@
 #define LED_BLUE_PORT PORTC
 #define LED_BLUE_PIN 2U
 
+/* number of splitflaps that are connected / used. max 4. */
+#define NUM_SF_USED 2
 
 /* vars */
 static McuLED_Handle_t LED_blue;
-static SF_Handle_t splitflap0, splitflap1;
+static SF_Handle_t splitflap[NUM_SF_USED];
 static uint32_t taskParameter1 = 5;
 static TaskHandle_t appTaskHandle = NULL;
 
@@ -46,9 +48,17 @@ void App_Init(void){
 	LED_blue = McuLED_InitLed(&config);
 
 	configureSplitflaps();
-	MultiSplitFlap_Init(2);
-	MultiSplitFlap_AddFlap(splitflap0);
-	MultiSplitFlap_AddFlap(splitflap1);
+	MultiSplitFlap_Init(NUM_SF_USED);
+	MultiSplitFlap_AddFlap(splitflap[0]);
+#if (NUM_SF_USED > 1)
+	MultiSplitFlap_AddFlap(splitflap[1]);
+#endif
+#if (NUM_SF_USED > 2)
+	MultiSplitFlap_AddFlap(splitflap[2]);
+#endif
+#if (NUM_SF_USED > 3)
+	MultiSplitFlap_AddFlap(splitflap[3]);
+#endif
 }
 
 /* App Task */
@@ -120,9 +130,9 @@ static void App_Task(void* pv){
 	while(1){
 		for(int i = 0; i < sizeof(letters)/sizeof(letters[0]); i++){
 			McuWait_Waitms(1000);
-			McuLog_info("Moving to letter '%s', position is %i", letters[i], (int)SF_GetMotorPosition(splitflap0));
-			SF_MoveToFlap(splitflap0, letters[i]);
-			McuLog_info("Position after move is is %i", (int)SF_GetMotorPosition(splitflap0));
+			McuLog_info("Moving to letter '%s', position is %i", letters[i], (int)SF_GetMotorPosition(splitflap[0]));
+			SF_MoveToFlap(splitflap[0], letters[i]);
+			McuLog_info("Position after move is is %i", (int)SF_GetMotorPosition(splitflap[0]));
 		}
 	}
 }
@@ -190,8 +200,9 @@ void configureSplitflaps(void){
 	sf0Config.motorConfig = motor0Config;
 
 	/* instanciate splitflap 0 */
-	splitflap0 = SF_Init(&sf0Config);
+	splitflap[0] = SF_Init(&sf0Config);
 
+#if (NUM_SF_USED > 1)
     /* SPLITFLAP 1 */
     /* configure the motor */
     McuULN2003_Config_t motor1Config;
@@ -210,7 +221,7 @@ void configureSplitflaps(void){
     motor1Config.hw[3].pin  = STEPPER_MOTOR1_IN4_PIN;
     motor1Config.inverted   = true;
 
-    /* configure magnetic sensor for motor 0 */
+    /* configure magnetic sensor for motor 1 */
     McuGPIO_Config_t magSensor1Config;
     McuGPIO_GetDefaultConfig(&magSensor1Config);
     magSensor1Config.hw.gpio     = MAG_MOTOR1_GPIO;
@@ -219,7 +230,7 @@ void configureSplitflaps(void){
     magSensor1Config.isInput = true;
     magSensor1Config.hw.pull = McuGPIO_PULL_UP;
 
-    /* create config instance for splitflap 0 */
+    /* create config instance for splitflap 1 */
     SF_Config_t sf1Config;
     sf1Config.setupIdentifier = 1;
 	sf1Config.hardwareIdentifier = 20;  // default value
@@ -227,5 +238,84 @@ void configureSplitflaps(void){
     sf1Config.motorConfig = motor1Config;
 
     /* instanciate splitflap 1 */
-    splitflap1 = SF_Init(&sf1Config);
+    splitflap[1] = SF_Init(&sf1Config);
+#endif
+
+#if (NUM_SF_USED > 2)
+    /* SPLITFLAP 2 */
+    /* configure the motor */
+    McuULN2003_Config_t motor2Config;
+    McuULN2003_GetDefaultConfig(&motor2Config);
+    motor2Config.hw[0].gpio = STEPPER_MOTOR2_IN1_GPIO;
+    motor2Config.hw[0].port = STEPPER_MOTOR2_IN1_PORT;
+    motor2Config.hw[0].pin  = STEPPER_MOTOR2_IN1_PIN;
+    motor2Config.hw[1].gpio = STEPPER_MOTOR2_IN2_GPIO;
+    motor2Config.hw[1].port = STEPPER_MOTOR2_IN2_PORT;
+    motor2Config.hw[1].pin  = STEPPER_MOTOR2_IN2_PIN;
+    motor2Config.hw[2].gpio = STEPPER_MOTOR2_IN3_GPIO;
+    motor2Config.hw[2].port = STEPPER_MOTOR2_IN3_PORT;
+    motor2Config.hw[2].pin  = STEPPER_MOTOR2_IN3_PIN;
+    motor2Config.hw[3].gpio = STEPPER_MOTOR2_IN4_GPIO;
+    motor2Config.hw[3].port = STEPPER_MOTOR2_IN4_PORT;
+    motor2Config.hw[3].pin  = STEPPER_MOTOR2_IN4_PIN;
+    motor2Config.inverted   = true;
+
+    /* configure magnetic sensor for motor 2 */
+    McuGPIO_Config_t magSensor2Config;
+    McuGPIO_GetDefaultConfig(&magSensor2Config);
+    magSensor2Config.hw.gpio     = MAG_MOTOR2_GPIO;
+    magSensor2Config.hw.port     = MAG_MOTOR2_PORT;
+    magSensor2Config.hw.pin     = MAG_MOTOR2_PIN;
+    magSensor2Config.isInput = true;
+    magSensor2Config.hw.pull = McuGPIO_PULL_UP;
+
+    /* create config instance for splitflap 2 */
+    SF_Config_t sf2Config;
+    sf2Config.setupIdentifier = 1;
+	sf2Config.hardwareIdentifier = 20;  // default value
+    sf2Config.magSensorConfig = magSensor2Config;
+    sf2Config.motorConfig = motor2Config;
+
+    /* instanciate splitflap 2 */
+    splitflap[2] = SF_Init(&sf2Config);
+#endif
+
+#if (NUM_SF_USED > 3)
+    /* SPLITFLAP 3 */
+    /* configure the motor */
+    McuULN2003_Config_t motor3Config;
+    McuULN2003_GetDefaultConfig(&motor3Config);
+    motor3Config.hw[0].gpio = STEPPER_MOTOR3_IN1_GPIO;
+    motor3Config.hw[0].port = STEPPER_MOTOR3_IN1_PORT;
+    motor3Config.hw[0].pin  = STEPPER_MOTOR3_IN1_PIN;
+    motor3Config.hw[1].gpio = STEPPER_MOTOR3_IN2_GPIO;
+    motor3Config.hw[1].port = STEPPER_MOTOR3_IN2_PORT;
+    motor3Config.hw[1].pin  = STEPPER_MOTOR3_IN2_PIN;
+    motor3Config.hw[2].gpio = STEPPER_MOTOR3_IN3_GPIO;
+    motor3Config.hw[2].port = STEPPER_MOTOR3_IN3_PORT;
+    motor3Config.hw[2].pin  = STEPPER_MOTOR3_IN3_PIN;
+    motor3Config.hw[3].gpio = STEPPER_MOTOR3_IN4_GPIO;
+    motor3Config.hw[3].port = STEPPER_MOTOR3_IN4_PORT;
+    motor3Config.hw[3].pin  = STEPPER_MOTOR3_IN4_PIN;
+    motor3Config.inverted   = true;
+
+    /* configure magnetic sensor for motor 3 */
+    McuGPIO_Config_t magSensor3Config;
+    McuGPIO_GetDefaultConfig(&magSensor3Config);
+    magSensor3Config.hw.gpio     = MAG_MOTOR3_GPIO;
+    magSensor3Config.hw.port     = MAG_MOTOR3_PORT;
+    magSensor3Config.hw.pin     = MAG_MOTOR3_PIN;
+    magSensor3Config.isInput = true;
+    magSensor3Config.hw.pull = McuGPIO_PULL_UP;
+
+    /* create config instance for splitflap 3 */
+    SF_Config_t sf3Config;
+    sf3Config.setupIdentifier = 1;
+	sf3Config.hardwareIdentifier = 20;  // default value
+    sf3Config.magSensorConfig = magSensor3Config;
+    sf3Config.motorConfig = motor3Config;
+
+    /* instanciate splitflap 3 */
+    splitflap[3] = SF_Init(&sf3Config);
+#endif
 }
diff --git a/ADIS_tinyK22_SplitFlap/source/multi-splitflap.c b/ADIS_tinyK22_SplitFlap/source/multi-splitflap.c
index 015980f..9808133 100644
--- a/ADIS_tinyK22_SplitFlap/source/multi-splitflap.c
+++ b/ADIS_tinyK22_SplitFlap/source/multi-splitflap.c
@@ -16,7 +16,7 @@
 static dict_t **flapDict;
 static uint8_t addedFlaps = 0;
 static const uint8_t BYTES_PER_KEY = 3;
-static char* flapKeys[NUM_FLAPS];  // reserve memory
+static char* flapKeys[10]; // TODO improve
 
 /* function declarations */
 void initFlapKeys(uint8_t numberOfFlaps);
@@ -24,13 +24,13 @@ void initFlapKeys(uint8_t numberOfFlaps);
 /**********************/
 /* INIT / DEINIT      */
 /**********************/
-void MultiSplitFlap_Init(){
+void MultiSplitFlap_Init(uint8_t numFlaps){
 	addedFlaps = 0;
 	flapDict = dictAlloc();
 	((dict_t*)flapDict)->key=NULL;
 	((dict_t*)flapDict)->value=NULL;
 	((dict_t*)flapDict)->next=NULL;
-	initFlapKeys(NUM_FLAPS);
+	initFlapKeys(numFlaps);
 }
 
 void MultiSplitFlap_Deinit(void){
diff --git a/ADIS_tinyK22_SplitFlap/source/multi-splitflap.h b/ADIS_tinyK22_SplitFlap/source/multi-splitflap.h
index c1ec2d1..40f2eb6 100644
--- a/ADIS_tinyK22_SplitFlap/source/multi-splitflap.h
+++ b/ADIS_tinyK22_SplitFlap/source/multi-splitflap.h
@@ -12,8 +12,9 @@
 
 #define NUM_FLAPS 2 // Number of flaps that can be added to the combination
 
-/* initialize dictionary */
-void MultiSplitFlap_Init();
+/* initialize dictionary.
+ * numFlaps: Amount of flaps to be used*/
+void MultiSplitFlap_Init(uint8_t numFlaps);
 
 /* de-initialize: deallocate memory etc. */
 void MultiSplitFlap_Deinit(void);
diff --git a/ADIS_tinyK22_SplitFlap/source/splitflap_pins.h b/ADIS_tinyK22_SplitFlap/source/splitflap_pins.h
index 6f7e025..04a6556 100644
--- a/ADIS_tinyK22_SplitFlap/source/splitflap_pins.h
+++ b/ADIS_tinyK22_SplitFlap/source/splitflap_pins.h
@@ -59,6 +59,38 @@
 #define STEPPER_MOTOR1_IN4_PORT		PORTA
 #define STEPPER_MOTOR1_IN4_PIN		12U
 
-/* TODO define motors 2 and 3 */
+/* motor 2 */
+#define STEPPER_MOTOR2_IN1_GPIO		GPIOD
+#define STEPPER_MOTOR2_IN1_PORT		PORTD
+#define STEPPER_MOTOR2_IN1_PIN		4U
+
+#define STEPPER_MOTOR2_IN2_GPIO		GPIOD
+#define STEPPER_MOTOR2_IN2_PORT		PORTD
+#define STEPPER_MOTOR2_IN2_PIN		5U
+
+#define STEPPER_MOTOR2_IN3_GPIO		GPIOD
+#define STEPPER_MOTOR2_IN3_PORT		PORTD
+#define STEPPER_MOTOR2_IN3_PIN		6U
+
+#define STEPPER_MOTOR2_IN4_GPIO		GPIOD
+#define STEPPER_MOTOR2_IN4_PORT		PORTD
+#define STEPPER_MOTOR2_IN4_PIN		7U
+
+/* motor 3 */
+#define STEPPER_MOTOR3_IN1_GPIO		GPIOD
+#define STEPPER_MOTOR3_IN1_PORT		PORTD
+#define STEPPER_MOTOR3_IN1_PIN		0U
+
+#define STEPPER_MOTOR3_IN2_GPIO		GPIOD
+#define STEPPER_MOTOR3_IN2_PORT		PORTD
+#define STEPPER_MOTOR3_IN2_PIN		1U
+
+#define STEPPER_MOTOR3_IN3_GPIO		GPIOD
+#define STEPPER_MOTOR3_IN3_PORT		PORTD
+#define STEPPER_MOTOR3_IN3_PIN		2U
+
+#define STEPPER_MOTOR3_IN4_GPIO		GPIOD
+#define STEPPER_MOTOR3_IN4_PORT		PORTD
+#define STEPPER_MOTOR3_IN4_PIN		3U
 
 #endif /* SPLITFLAP_PINS_H_ */