stream_sensor_data.py 文件源码

def measure():
    # Send a 10us pulse to trigger
    GPIO.output(GPIO_TRIGGER, True)
    time.sleep(0.00001)
    GPIO.output(GPIO_TRIGGER, False)

    start = time.time()

    while GPIO.input(GPIO_ECHO) == 0:
        start = time.time()

    while GPIO.output(GPIO_ECHO) == 1:
        stop = time.time()

    elapsed = stop - start
    distance = (elapsed * 34300) / 2

    return distance