findDistance.py 文件源码

def __init__(self):

        gpio.setmode(gpio.BOARD)

        # set up  and init 
        self.trigger = 11
        self.echo = 13

        gpio.setup(self.trigger, gpio.OUT)
        gpio.setup(self.echo, gpio.IN)

        self.pulse_start = 0.
        self.pulse_end = 0.
        self.speed_of_sound = 343 * 100
        self.car_length = 1