diff --git a/ESP-IDF_Robot/main/blink_example_main.c b/ESP-IDF_Robot/main/blink_example_main.c
index 17e031a48..67f79abd6 100644
--- a/ESP-IDF_Robot/main/blink_example_main.c
+++ b/ESP-IDF_Robot/main/blink_example_main.c
@@ -62,6 +62,8 @@ TIMER RESOLUTION    MAX VALUE   HALF-DUTY
 #define BLINK_GPIO      CONFIG_BLINK_GPIO       // 10 GPIO of on-board LED
 #define PUSH_BTN_GPIO   CONFIG_BUTTON_GPIO      // 3 GPIO of on-board push-button
 #define MTR_FL_GPIO     0 //CONFIG_MOTOR_FRONT_LEFT_GPIO
+#define PROJ_X          (4)                     // 4 GPIO joystick, x-axis
+#define PROJ_Y          (6)                     // 6 GPIO joystick, y-axis
 
 #define ESP_INTR_FLAG_DEFAULT 0