from machine import Pin, time_pulse_us
import time


trigger_pin = 4  
echo_pin = 16    


trigger = Pin(trigger_pin, Pin.OUT)
echo = Pin(echo_pin, Pin.IN)


def measure_distance():
    
    trigger.value(0)
    time.sleep_us(2)
    
    
    trigger.value(1)
    time.sleep_us(10)
    trigger.value(0)
    
    
    duration = time_pulse_us(echo, 1, 30000)  
    distance = (duration / 2) / 29.1
    
    return distance


try:
    while True:
        distance = measure_distance()  
        print("Distance:", distance, "cm")  
        time.sleep(1)  
except KeyboardInterrupt:
    print("Measurement stopped by user.")