from machine import Pin,time_pulse_us
from time import sleep_us,sleep
ECHO_PIN=26
TRIGGER_PIN=27
trigger_Pin(TRIGGER_PIN,Pin.OUT)
echo=Pin(ECHO_PIN,Pin.IN)
led=Pin(22,Pin.OUT)

def measure_distance();
trigger_low()
sleep_us(2)

trigger_high()
sleep_us(10)
trigger_low()

pulse_duration=time_pulse_us(echo,Pin.high)
distance=pulse_duration *0.0343/2
return distance

def main()
    while true:
        distance=measure_distance()
        if(distance>200):
            led.on()
            sleep(0.5)
        else:
            led.off()
            sleep(0.5)
        print("Distance:{:.2f}cm".format(distance))
        sleep(1)
if__name__=="__main__":
        main()