Cats DSC07535

Published on April 11th, 2014 | by C Bratt


Cat litter with microcontrolled motion detection and LED counter



Ikea: Metod/ Maximera 40cm (490.243.06)
Ikea: Trofast (800.892.39)
Ikea: Utrusta 40cm(802.046.73)
Ikea: Variera Drawe mat (800.128.53)

Trixie 2-Way Cat Flap door
Arduino Uno single-board microcontroller
Adafruit PIR motion sensor
Adafruit Neopixel Stick 8x
Metal Pushbutton

Some cables and a plastic box that previously housed a soldering iron from Biltema.


I wanted to hide the cat litter box in our small bathroom. Only problem was that it was so well hidden and odor free that I forgot it all the time! :( . Problem was then solved with a programmable micro-controller, motion sensor and a led strip with 8x individual controlled led’s that could change colors. Led strip work as a counter and change colors based on how many times the cat enters the cabin. It resets the counter when the button is pushed.
1-4x   = Green
5x     = Orange
6-7x   = Red
8x     = Pulsing Red and Orange

Future update plans:
* Larger and higher plastic litter box.
* Fancier wiring.
* Add a GSM module to the controller and make it send text SMS when the box needs to be emptied, or when the cat breaks a certain visit/day/time pattern.




Free-standing Billy lockers
Kids workbench

The Author

C Bratt

13 Responses to Cat litter with microcontrolled motion detection and LED counter

  1. Ella says:

    Anyone else concerned that the cats have to use the facilities in a dark inclosed space, next to a loud rocking machine? Many cats are afraid of washing machines or at least would not like to be so close to it. This is at best a thoughtless hack, if not selfish.

    • C Bratt C Bratt says:

      I was a little worried about this very well, although I know that cats have very good night vision. Mounted a small white LED inside the box so that it does not become completely pitch black.

  2. ineade says:

    this is really cool! I would love to see an instructable so I could also make it.

  3. Fırsat says:

    That is so brilliant thinking.

  4. tikismoke says:

    Very compressive. You should post in on with schematics and code. I also have the same problem and certainly going to do the same now I see this.


  5. Cassie says:

    Brilliant. This is very Instructables worthy.

  6. Saskia says:

    You should sell (or get a patent on) this idea, especially if you get the app working ^^ awesome!

  7. Jenna says:

    Please do an step by step tutorial on for this hack, pretty please.

  8. Jenna says:

    Please do an step by step tutorial on for this hack, pretty please.

  9. C Bratt C Bratt says:


    It has really fulfilled the purpose it was made for, no odor and have never forgotten to clean it. Also have updated the “hack” quite a lot since the post was made. New litter box and new controller box. Dunno how to update the images and description here tow.

  10. Mina says:

    The best cat-litter-box solution I’ve ever seen!!! Bravo!!!

  11. Zully H says:

    So cool! Best hack I’ve seen in a while

  12. Jenna says:


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