from gpiozero.pins.pigpio import PiGPIOFactory
from gpiozero import DistanceSensor
pigpio = PiGPIOFactory()
ds = DistanceSensor(14,15, max_distance=200, pin_factory=pigpio)
or
from gpiozero.pins.pigpio import PiGPIOFactory
from gpiozero import DistanceSensor
ds = DistanceSensor(14,15, max_distance=200, pin_factory=PiGPIOFactory())