diff --git a/inc/ultrasonic_driver.h b/inc/ultrasonic_driver.h
index 67eb449..8a7dc40 100644
--- a/inc/ultrasonic_driver.h
+++ b/inc/ultrasonic_driver.h
@@ -7,8 +7,21 @@
 
 #include "gd32e23x.h"
 
+#define POWER_SUPPLY_12V
+// #define POWER_SUPPLY_24V
+
+#ifdef POWER_SUPPLY_12V
+    #define TIME_CORRECTION_US  250
+    #define CAPTURE_VALUE_MAX   515
+#elif defined(POWER_SUPPLY_24V)
+    #define TIME_CORRECTION_US  230
+    #define CAPTURE_VALUE_MAX   550
+#else
+    #error "Please define either POWER_SUPPLY_12V or POWER_SUPPLY_24V"
+#endif
+
 #define ULTRASONIC_CYCLES   0x05U
-#define ULTRASONIC_TRAN_US  100  // (ms)
+#define ULTRASONIC_TRAN_US  500  // (ms)
 
 #define LED_PORT            GPIOA
 #define LED_PIN             GPIO_PIN_9
@@ -48,16 +61,11 @@
 #define US_ECHO_TIMER        TIMER16
 #define US_ECHO_CH           TIMER_CH_0
 
-#define SOUND_SPEED         340      // m/s
-#define TIME_CORRECTION_US  250
-
 void led_config(void);
 void usart_config(void);
 void ultrasonic_config(void);
 void ultrasonic_transmit_config(void);
 void ultrasonic_pwm_out_cycles(const uint8_t cycles);
-
-
 void ultrasonic_transmit_delay(const uint16_t micro_second);
 void recevice_exti_config(void);
 void ultrasonic_echo_timer_config(void);
diff --git a/src/main.c b/src/main.c
index c396c80..1da61d9 100644
--- a/src/main.c
+++ b/src/main.c
@@ -4,7 +4,7 @@
 
     \version 2024-02-22, V2.1.0, firmware for GD32E23x
 */
-#include "main.h"
+// #include "main.h"
 #include <stdio.h>
 #include "gd32e23x.h"
 #include "systick.h"
@@ -40,7 +40,6 @@ int main(void)
     /* ---------- debug end ---------- */
 
     printf("\r\n");
-    printf("START!\r\n");
     printf("XLSW-3DP-UltraSonic Analog 300K!\r\n");
     printf("\r\n");
 
@@ -49,18 +48,20 @@ int main(void)
     while(1)
     {
         delay_ms(ULTRASONIC_TRAN_US);
+
         ultrasonic_pwm_out_cycles(ULTRASONIC_CYCLES);
-        // printf("Send ultra sonic driver signal!\r\n");
-    delay_ms(2);
-        printf("cap_val:%ld\n", capture_value);
+
+        delay_ms(2);
+        printf("cap_val:%ld\t", capture_value);
+
+        const char* result = (capture_value <= CAPTURE_VALUE_MAX) ? "Distance: %d\n" : "Over Range\n";
         distance_uint16 = calculate_distance(capture_value);
-        printf("Distance:%d\n", distance_uint16);
+        printf(result, distance_uint16);
     }
 }
 
 /* retarget the C library printf function to the USART */
-int _write (int fd, char *pBuffer, int size)
-{
+int _write (int fd, char *pBuffer, int size) {
     for (int i = 0; i < size; i++)
     {
         usart_data_transmit(USART0, (uint8_t)pBuffer[i]);
diff --git a/src/ultrasonic_driver.c b/src/ultrasonic_driver.c
index cd2274c..bc91078 100644
--- a/src/ultrasonic_driver.c
+++ b/src/ultrasonic_driver.c
@@ -6,8 +6,7 @@
 #include "gd32e23x.h"
 #include "systick.h"
 
-void led_config(void)
-{
+void led_config(void) {
     rcu_periph_clock_enable(LED_RCU);
 
     gpio_mode_set(LED_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_PIN);
@@ -34,8 +33,7 @@ void led_config(void)
     nvic_irq_enable(LED_IRQ, 0);
 }
 
-void usart_config(void)
-{
+void usart_config(void) {
     rcu_periph_clock_enable(USART_GPIO_RCU);
     rcu_periph_clock_enable(USART_RCU);
 
@@ -54,8 +52,7 @@ void usart_config(void)
     usart_enable(USART0_PHY);
 }
 
-void ultrasonic_config(void)
-{
+void ultrasonic_config(void) {
     rcu_periph_clock_enable(US_TRAN_GPIO_RCU);
 
     gpio_mode_set(US_TRAN_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_NONE, US_TRAN_PIN);
@@ -154,8 +151,7 @@ void recevice_exti_config(void) {
     // exti_interrupt_enable(EXTI_0);
 }
 
-void ultrasonic_echo_timer_config(void)
-{
+void ultrasonic_echo_timer_config(void) {
     rcu_periph_clock_enable(US_ECHO_RCU);
     timer_deinit(US_ECHO_TIMER);