DistanceSensor returns Zero when distance less than 25cm

[AmirSasson]

i have checked and the hardware is fine i am using HCSR04 on RPI Zero W
it seems like the echo is returning "too fast" and results zero when the distance less than ~25cm
i know there were many discussions on this, but all the issues are closed,
i am using the latest release 1.4.1

[bennuttall]

This issue was fixed in 1.4.1 but there's a chance you're doing something different which is causing a replication of it.

Can you confirm:

• You are using Raspbian Stretch
• You have not installed gpiozero with pip
• You are definitely using v1.4.1 (please check)
• You are using the RPi.GPIO Pin Factory (please check by running):

  from gpiozero import Device
  print(Device.pin_factory)

• You have tested the most basic version of the DistanceSensor code (nothing else could be slowing it down)

[SteveAmor]

This is the behaviour that I have seen for a PiZero as I reported in #595 (comment) which is identical code which subsequently ended up in V1.4.1.
The more accurate fix would be as @waveform80 states at the end of #385 (comment)

[bennuttall]

This should be fixed on master now. Two big improvements to the way we calculate distance thanks to great effort from @waveform80. Please test if you can:

git clone https://github.com/RPi-Distro/python-gpiozero
cd python-gpiozero
sudo pip3 install .

The v1.5.0 release is expected very soon.