from machine import Pin,PWMimport timetrig = 15echo = 13led = 4 echo = Pin(echo, Pin.IN)led = Pin(led, Pin.OUT)trig = Pin(trig, Pin.OUT)servo = PWM(Pin(2), freq=50, duty=77)trig.off()time.sleep_ms(2)trig.on()time.sleep_ms(10)trig.off() def get_distance(unit="cm"): ...