diff --git a/ESP-IDF_Robot/main/blink_example_main.c b/ESP-IDF_Robot/main/blink_example_main.c
index b41102d82..d1441c12e 100644
--- a/ESP-IDF_Robot/main/blink_example_main.c
+++ b/ESP-IDF_Robot/main/blink_example_main.c
@@ -17,6 +17,8 @@
 
 static const char *TAG = "ESP IDF Robot";
 
+#define PUSH_BTN_GPIO   3
+
 /* Use project configuration menu (idf.py menuconfig) to choose the GPIO to blink,
    or you can edit the following line and set a number here.
 */