Sainsmart Hall-Effect Rostock Z-Probe Automatic Bed Leveling

This is a remix of the original but this one uses the Sainsmart Hall-Effect board.

you can find that here:
https://www.sainsmart.com/sainsmart-hall-effect-sensor-switch-magnetic-detector-module-for-arduino-motor.html

cheep and good...

for the rod I use a rod from a CD/DVD player / Rom, they seem to be all the same size.
The magnets are 3/16" cube.

You may need to ream out the hole as well as add a spring to make sure it comes back out...

some setup details

1. make sure y