diff --git a/Inc/config.h b/Inc/config.h
index 0f738db..dd2c84e 100644
--- a/Inc/config.h
+++ b/Inc/config.h
@@ -8,7 +8,7 @@
 #if !defined(PLATFORMIO)
   //#define VARIANT_ADC         // Variant for control via ADC input
   //#define VARIANT_USART       // Variant for Serial control via USART3 input
-  //#define VARIANT_ NUNCHUK    // Variant for Nunchuk controlled vehicle build
+  //#define VARIANT_NUNCHUK    // Variant for Nunchuk controlled vehicle build
   //#define VARIANT_PPM         // Variant for RC-Remote with PPM-Sum Signal
   //#define VARIANT_IBUS        // Variant for RC-Remotes with FLYSKY IBUS
   //#define VARIANT_HOVERCAR    // Variant for HOVERCAR build
@@ -197,7 +197,7 @@
   #define ADC2_MAX            2200      // max ADC2-value while poti at maximum-position (0 - 4095)
 #endif
 
-#ifdef VARIANT_ NUNCHUK
+#ifdef VARIANT_NUNCHUK
   // ###### CONTROL VIA NINTENDO  NUNCHUK ######
   /* left sensor board cable.
   * keep cable short, use shielded cable, use ferrits, stabalize voltage in nunchuk,
@@ -205,7 +205,7 @@
   * use original nunchuk. most clones does not work very well.
   * Recommendation: Nunchuk Breakout Board https://github.com/Jan--Henrik/hoverboard-breakout
   */
-  #define CONTROL_ NUNCHUK            // use nunchuk as input. disable FEEDBACK_SERIAL_USART3, DEBUG_SERIAL_USART3!
+  #define CONTROL_NUNCHUK            // use nunchuk as input. disable FEEDBACK_SERIAL_USART3, DEBUG_SERIAL_USART3!
 #endif
 
 // ############################### MOTOR CONTROL #########################
@@ -272,12 +272,12 @@
 #define RATE                  480   // 30.0f [-] lower value == slower rate [0, 32767] = [0.0, 2047.9375]. Do NOT make rate negative (>32767)
 
 // Value of FILTER is in fixdt(0,16,16): VAL_fixedPoint = VAL_floatingPoint * 2^16. In this case 6553 = 0.1 * 2^16
-#ifndef VARIANT_ NUNCHUK
+#ifndef VARIANT_NUNCHUK
   #define FILTER                6553  // 0.1f [-] lower value == softer filter [0, 65535] = [0.0 - 1.0].
 #endif
 
 // ################################# DEFAULT SETTINGS ############################
-#if !defined(VARIANT_HOVERCAR) && !defined(VARIANT_TRANSPOTTER) && !defined(VARIANT_ NUNCHUK)
+#if !defined(VARIANT_HOVERCAR) && !defined(VARIANT_TRANSPOTTER) && !defined(VARIANT_NUNCHUK)
   // Value of COEFFICIENT is in fixdt(1,16,14)
   // If VAL_floatingPoint >= 0, VAL_fixedPoint = VAL_floatingPoint * 2^14
   // If VAL_floatingPoint < 0,  VAL_fixedPoint = 2^16 + floor(VAL_floatingPoint * 2^14).
@@ -301,7 +301,7 @@
 #ifdef VARIANT_TRANSPOTTER
   #define CONTROL_GAMETRAK
   #define SUPPORT_LCD
-  #define SUPPORT_ NUNCHUK
+  #define SUPPORT_NUNCHUK
 
   #define GAMETRAK_CONNECTION_NORMAL    // for normal wiring according to the wiki instructions
   //#define GAMETRAK_CONNECTION_ALTERNATE // use this define instead if you messed up the gametrak ADC wiring (steering is speed, and length of the wire is steering)
@@ -316,8 +316,8 @@
   #define STEER_COEFFICIENT   8192   // 0.5f - higher value == stronger. if you do not want any steering, set it to 0.0; 0.0 to 1.0
 #endif
 
-// ################################# VARIANT_ NUNCHUK SETTINGS ############################
-#ifdef VARIANT_ NUNCHUK
+// ################################# VARIANT_NUNCHUK SETTINGS ############################
+#ifdef VARIANT_NUNCHUK
   // # ARMCHAIR #
   #define FILTER             3276    //  0.05f
   #define SPEED_COEFFICIENT  8192    //  0.5f
@@ -333,7 +333,7 @@
 
 // ############################### VALIDATE SETTINGS ###############################
 
-#if !defined(VARIANT_ADC) && !defined(VARIANT_USART) && !defined(VARIANT_HOVERCAR) && !defined(VARIANT_TRANSPOTTER) && !defined(VARIANT_ NUNCHUK) && !defined(VARIANT_PPM)&& !defined(VARIANT_IBUS)
+#if !defined(VARIANT_ADC) && !defined(VARIANT_USART) && !defined(VARIANT_HOVERCAR) && !defined(VARIANT_TRANSPOTTER) && !defined(VARIANT_NUNCHUK) && !defined(VARIANT_PPM)&& !defined(VARIANT_IBUS)
   #error Variant not defined! Please check platformio.ini or Inc/config.h for available variants.
 #endif
 
@@ -365,16 +365,16 @@
   #error CONTROL_PPM and SERIAL_USART2 not allowed. It is on the same cable.
 #endif
 
-#if (defined(DEBUG_SERIAL_USART3) || defined(CONTROL_SERIAL_USART3)) && defined(CONTROL_ NUNCHUK)
-  #error CONTROL_ NUNCHUK and SERIAL_USART3 not allowed. It is on the same cable.
+#if (defined(DEBUG_SERIAL_USART3) || defined(CONTROL_SERIAL_USART3)) && defined(CONTROL_NUNCHUK)
+  #error CONTROL_NUNCHUK and SERIAL_USART3 not allowed. It is on the same cable.
 #endif
 
 #if (defined(DEBUG_SERIAL_USART3) || defined(CONTROL_SERIAL_USART3)) && defined(DEBUG_I2C_LCD)
   #error DEBUG_I2C_LCD and SERIAL_USART3 not allowed. It is on the same cable.
 #endif
 
-#if defined(CONTROL_PPM) && defined(CONTROL_ADC) && defined(CONTROL_ NUNCHUK) || defined(CONTROL_PPM) && defined(CONTROL_ADC) || defined(CONTROL_ADC) && defined(CONTROL_ NUNCHUK) || defined(CONTROL_PPM) && defined(CONTROL_ NUNCHUK)
-  #error only 1 input method allowed. use CONTROL_PPM or CONTROL_ADC or CONTROL_ NUNCHUK.
+#if defined(CONTROL_PPM) && defined(CONTROL_ADC) && defined(CONTROL_NUNCHUK) || defined(CONTROL_PPM) && defined(CONTROL_ADC) || defined(CONTROL_ADC) && defined(CONTROL_NUNCHUK) || defined(CONTROL_PPM) && defined(CONTROL_NUNCHUK)
+  #error only 1 input method allowed. use CONTROL_PPM or CONTROL_ADC or CONTROL_NUNCHUK.
 #endif
 
 #if defined(ADC_PROTECT_ENA) && ((ADC1_MIN - ADC_PROTECT_THRESH) <= 0 || (ADC1_MAX + ADC_PROTECT_THRESH) >= 4096)
diff --git a/README.md b/README.md
index 6c2eaa0..8debc84 100644
--- a/README.md
+++ b/README.md
@@ -156,7 +156,7 @@ Most robust way for input is to use the ADC and potis. It works well even on 1m
 This firmware offers currently these variants (selectable in [platformio.ini](/platformio.ini) and / or [/Inc/config.h](/Inc/config.h)):
 - **VARIANT_ADC**: In this variant the motors are controlled by two potentiometers connected to the Left sensor cable (long wired)
 - **VARIANT_USART**: In this variant the motors are controlled via serial protocol on USART3 right sensor cable (short wired). The commands can be sent from an Arduino. Check out the [hoverserial.ino](/02_Arduino/hoverserial) as an example sketch.
-- **VARIANT_ NUNCHUK**: Wii Nunchuk offers one hand control for throttle, braking and steering. This was one of the first input device used for electric armchairs or bottle crates.
+- **VARIANT_NUNCHUK**: Wii Nunchuk offers one hand control for throttle, braking and steering. This was one of the first input device used for electric armchairs or bottle crates.
 - **VARIANT_PPM**: This is when you want to use a RC remote control with PPM Sum signal
 - **VARIANT_IBUS**: This is when you want to use a RC remote control with Flysky IBUS protocol connected to the Left sensor cable.
 - **VARIANT_HOVERCAR**: In this variant the motors are controlled by two pedals brake and throttle. Reverse is engaged by double tapping on the brake pedal at standstill.
diff --git a/Src/main.c b/Src/main.c
index 27dda00..de6370e 100644
--- a/Src/main.c
+++ b/Src/main.c
@@ -146,7 +146,7 @@ typedef struct{
 static SerialFeedback Feedback;
 #endif
 
-#if defined(CONTROL_ NUNCHUK) || defined(SUPPORT_ NUNCHUK) || defined(CONTROL_PPM) || defined(CONTROL_ADC)
+#if defined(CONTROL_NUNCHUK) || defined(SUPPORT_NUNCHUK) || defined(CONTROL_PPM) || defined(CONTROL_ADC)
 static uint8_t button1, button2;
 #endif
 
@@ -304,7 +304,7 @@ int main(void) {
     PPM_Init();
   #endif
 
-  #ifdef CONTROL_ NUNCHUK
+  #ifdef CONTROL_NUNCHUK
     I2C_Init();
     Nunchuk_Init();
   #endif
@@ -453,7 +453,7 @@ int main(void) {
       }
     #endif
 
-    #if defined(CONTROL_ NUNCHUK) || defined(SUPPORT_ NUNCHUK)
+    #if defined(CONTROL_NUNCHUK) || defined(SUPPORT_NUNCHUK)
       if (nunchuk_connected != 0) {
         Nunchuk_Read();
         cmd1 = CLAMP((nunchuk_data[0] - 127) * 8, INPUT_MIN, INPUT_MAX); // x - axis. Nunchuk joystick readings range 30 - 230
@@ -714,7 +714,7 @@ int main(void) {
         poweroff();
       }
 
-      #ifdef SUPPORT_ NUNCHUK
+      #ifdef SUPPORT_NUNCHUK
         if (counter % 500 == 0) {
           if (nunchuk_connected == 0 && enable == 0) {
             if (Nunchuk_Ping()) {
diff --git a/Src/stm32f1xx_it.c b/Src/stm32f1xx_it.c
index 25dd6da..40fb78d 100644
--- a/Src/stm32f1xx_it.c
+++ b/Src/stm32f1xx_it.c
@@ -178,7 +178,7 @@ void SysTick_Handler(void) {
   /* USER CODE END SysTick_IRQn 1 */
 }
 
-#ifdef CONTROL_ NUNCHUK
+#ifdef CONTROL_NUNCHUK
 extern I2C_HandleTypeDef hi2c2;
 void I2C1_EV_IRQHandler(void)
 {
diff --git a/platformio.ini b/platformio.ini
index ce6f229..a28c724 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -11,7 +11,7 @@ src_dir     = Src
 ;
 ;default_envs = VARIANT_ADC         ; Variant for control via ADC input
 ;default_envs = VARIANT_USART       ; Variant for Serial control via USART3 input
-;default_envs = VARIANT_ NUNCHUK    ; Variant for Nunchuk controlled vehicle build
+;default_envs = VARIANT_NUNCHUK    ; Variant for Nunchuk controlled vehicle build
 ;default_envs = VARIANT_PPM         ; Variant for RC-Remotes with PPM-Sum signal
 ;default_envs = VARIANT_IBUS        ; Variant for RC-Remotes with FLYSKY IBUS
 ;default_envs = VARIANT_HOVERCAR    ; Variant for HOVERCAR build
@@ -70,7 +70,7 @@ build_flags =
 
 ;================================================================
 
-[env:VARIANT_ NUNCHUK]
+[env:VARIANT_NUNCHUK]
 platform        = ststm32
 framework       = stm32cube
 board           = genericSTM32F103RC
@@ -86,7 +86,7 @@ build_flags =
     -Wl,-lm
     -g -ggdb        ; to generate correctly the 'firmware.elf' for STM STUDIO vizualization
 #    -Wl,-lnosys
-    -D VARIANT_ NUNCHUK
+    -D VARIANT_NUNCHUK
     -D PLATFORMIO
 
 ;================================================================