from gpiozero import DistanceSensor

ultrasonic = DistanceSensor(echo = 17, trigger = 4)

ultrasonic.distance

ultrasonic.max_distance = 1

##while True:
##    print(ultrasonic.distance)
##

##while True:
##    ultrasonic.wait_for_in_range()
##    print("In range")
##    print(ultrasonic.distance)
##
##    ultrasonic.wait_for_out_of_range()
##    print("Out of range")
##    print(ultrasonic.distance)
##
##ultrasonic.threshold_distance = 0.5

def hello():
    print("Hello")

def bye():
    print("Bye")


ultrasonic.when_in_range = hello

ultrasonic.when_out_of_range = bye