diff --git a/ESP-IDF_Robot/main/ultrasonic.h b/ESP-IDF_Robot/main/ultrasonic.h
index efd1e7ecd..13c0ab29b 100644
--- a/ESP-IDF_Robot/main/ultrasonic.h
+++ b/ESP-IDF_Robot/main/ultrasonic.h
@@ -1,4 +1,9 @@
 #ifndef __ULTRASONIC_H__
 #define __ULTRASONIC_H__
 
+typedef struct {
+    gpio_num_t trigger_gpio;  // GPIO for the trigger pin
+    gpio_num_t echo_gpio;     // GPIO for the echo pin
+} ultrasonic_sensor_t;
+
 #endif
\ No newline at end of file