import machine
import utime

trigger_pin = machine.Pin(10, machine.Pin.OUT)
echo_pin = machine.Pin(11, machine.Pin.IN)

def measure_distance():
    trigger_pin.on()
    utime.sleep_us(10)
    trigger_pin.off()

    while not echo_pin.value():
        pulse_start = utime.ticks_us()
    while echo_pin.value():
        pulse_end = utime.ticks_us()
    
    pulse_duration = utime.ticks_diff(pulse_end, pulse_start)
    distance_cm = pulse_duration / 58 
    return distance_cm

while True:
    distance = measure_distance()
    if distance < 40:  
        print("Parking space occupied")
        
    else:
        print("Parking space available")
        
    utime.sleep(1)