© pi-top 2020

from time import sleep
from ptpma.components import PMAUltrasonicSensor, PMALed

ultrasonic_sensor = PMAUltrasonicSensor("D4")
red_led = PMALed("D2")

while True:
    print(ultrasonic_sensor.distance)
    sleep(0.1)
    if ultrasonic_sensor.distance < 30:
        red_led.on()
    else:
        red_led.off()