Giveaway ended

*note, this could also be done with a different Arduino if you don't care so much about looks. The Nano is just very cheap and fits nicely into a small case.

Here's a link to download the Marlin 1.1.6 firmware for the CR-10 with Auto Bed Leveling enabled:
http://www.remainindoors.com/download...

you'll need to burn a bootloader to your printer before you can update the firmware. I'm working on making a video that explains how to do that on the CR-10 with the same Arduino Nano that you can use for your Sensor, but until then if you have a spare Arduino Uno laying around, you can follow the same steps I put up in my Firmware guide to updating the firmware on a Monoprice Maker Select here:
   • How to Burn a Bootloader and firmware...  

5x Arduino Nanos:
https://www.amazon.com/gp/product/B07...

9v DC Adapter (US):
https://www.amazon.com/gp/product/B07...

Breadboard DC Jack Module (multiple sources):
https://www.ebay.com/itm/DC005-to-DIP...

https://www.aliexpress.com/store/prod...

http://www.dx.com/p/dc005-to-dip-adap...

Comments on this part claim it's the same, but I haven't ordered one, so no promises:
https://www.amazon.com/gp/product/B06...

Inductive Sensor:
https://www.amazon.com/gp/product/B01...

Dupont Connectors:
https://www.amazon.com/gp/product/B01...

JST Connectors:
https://www.amazon.com/gp/product/B01...

If you don't want to bother with crimping JST connectors, you can probably get away with using something like these and just cutting them where you need to solder them to your board/splice into your sensor wires:
https://www.amazon.com/gp/product/B07...

PEI Sheet:
https://www.amazon.com/gp/product/B07...

Nano Case for Arduino Nano and Breadboard DC Jack Module:
https://www.thingiverse.com/thing:261...

18mm Sensor Mount for CR-10:
https://www.thingiverse.com/thing:249...

Arduino Sketch:
https://www.dropbox.com/s/ojfjarbgx7f...

Tom's Sensor Showdown video:
   • Autoleveling on 3D printers: 9 myths ...  

Uno Bed Leveling video here:
   • Nano Bed Leveling v1.2 | aka Uno Bed ...