diff --git a/thk_motor_driver_tb6612fng.cpp b/thk_motor_driver_tb6612fng.cpp
index 7d58963374782e648f49d2c01eb6da53c8c8220a..930461de8b6de33d16be8e84084233ab348c34b4 100644
--- a/thk_motor_driver_tb6612fng.cpp
+++ b/thk_motor_driver_tb6612fng.cpp
@@ -1,7 +1,5 @@
 #include "thk_motor_driver_tb6612fng.h"
 
-thk_MotorDriverTB6612FNG::thk_MotorDriverTB6612FNG(){}
-
 thk_MotorDriverTB6612FNG::thk_MotorDriverTB6612FNG(uint8_t motor_count, uint8_t pin_stby, uint8_t pin_pwm_a, uint8_t pin_in_1, uint8_t pin_in_2, uint8_t pin_pwm_b, uint8_t pin_in_3, uint8_t pin_in_4) : motor_count(motor_count), pin_stby(pin_stby), pin_pwm_a(pin_pwm_a),  pin_in_1(pin_in_1), pin_in_2(pin_in_2), pin_pwm_b(pin_pwm_b), pin_in_3(pin_in_3), pin_in_4(pin_in_4){}
 
 void thk_MotorDriverTB6612FNG::init()
diff --git a/thk_motor_driver_tb6612fng.h b/thk_motor_driver_tb6612fng.h
index 2a7bc78dc59ce77bd97a1165e73b6683cd3add6b..2c88d1e328203725f6fe353d2ee0c3d1360f104f 100644
--- a/thk_motor_driver_tb6612fng.h
+++ b/thk_motor_driver_tb6612fng.h
@@ -16,21 +16,20 @@
 class thk_MotorDriverTB6612FNG : public thk_MotorDriver
 {
     public:
-        thk_MotorDriverTB6612FNG();
         thk_MotorDriverTB6612FNG(uint8_t motor_count, uint8_t pin_stby, uint8_t pin_pwm_a, uint8_t pin_in_1, uint8_t pin_in_2, uint8_t pin_pwm_b, uint8_t pin_in_3, uint8_t pin_in_4);
         void stop() override; 
         void drive(uint8_t speed, bool is_forward) override;   
         void init();
 
     private:
-        uint8_t motor_count = 1;
-        uint8_t pin_stby = 38;
-        uint8_t pin_pwm_a = 6;
-        uint8_t pin_in_1 = 40;
-        uint8_t pin_in_2 = 42;
-        uint8_t pin_pwm_b = 0; 
-        uint8_t pin_in_3 = 0; 
-        uint8_t pin_in_4 = 0; 
+        uint8_t motor_count;
+        uint8_t pin_stby;
+        uint8_t pin_pwm_a;
+        uint8_t pin_in_1;
+        uint8_t pin_in_2;
+        uint8_t pin_pwm_b; 
+        uint8_t pin_in_3; 
+        uint8_t pin_in_4; 
 };
 
 #endif
\ No newline at end of file