diff --git a/Inc/defines.h b/Inc/defines.h
index e96bbd6..92e85c1 100644
--- a/Inc/defines.h
+++ b/Inc/defines.h
@@ -161,4 +161,10 @@ typedef struct {
 void filtLowPass16(int16_t u, uint16_t coef, int16_t *y);
 void filtLowPass32(int32_t u, uint16_t coef, int32_t *y);
 void mixerFcn(int16_t rtu_speed, int16_t rtu_steer, int16_t *rty_speedR, int16_t *rty_speedL);
-void rateLimiter16(int16_t u, int16_t rate, int16_t *y);
\ No newline at end of file
+void rateLimiter16(int16_t u, int16_t rate, int16_t *y);
+
+// Define I2C and Nunchuck functions
+void I2C_Init(void);
+void Nunchuck_Init(void);
+void Nunchuck_Read(void);
+uint8_t Nunchuck_Ping(void);
\ No newline at end of file