A Tweeting Litter Box


How can you not be interested in a project that uses load cells, Bluetooth, a Raspberry Pi, and Twitter. Even for those of our readers without a cat, [Scott's] tweeting litter box is worth the read.

Each aspect of this project can be re-purposed for almost any application. The inexpensive load cells, which available from eBay and other retailers, is used to sense when a cat is inside the litter box. Typically sensors like the load cell (that contain a strain gauge) this use a Wheatstone bridge, which is very important for maximizing the sensitivity of resistive sensor. The output then goes to a HX711, which is an ADC specifically built for load cells. A simple alternative would be using an instrumentation amplifier and the built-in ADC of the Arduino. Now, the magic happens. The weight reading is transmitted via an HC-06 Bluetooth module to a Raspberry Pi. Using a simple Perl script, the excreted weight, duration, and the cat’s resulting body weight is then tweeted!

Very nice work! This is a well thought out project that we could see being expanded to recognize the difference between multiple cats (or any other animal that goes inside).


  1. pcf11 says:

    When my cat drops a load you know it. No one has to tweet about the event.

  2. That just restored my faith in humanity.

  3. tecknight says:

    This definitely falls under the TMI category !!

  4. Aztraph says:

    I have 16 cats, I fail to . . . you know what? Never mind, I just fail.

  5. rasz_pl says:


  6. Max Siegieda says:


  7. qwach says:

    Life logging parody?

  8. anon says:

    Expensive and low effort – bluetooth and an entire raspberry pi dedicated to tweeting? The arduino could handle that.

    If you have the resources, then go for it – but it’s pretty wasteful.

  9. Zane says:

    Ladies and gentlemen, behold-

    The Future!

  10. Nibbler says:

    I just want to poop in peace, is that too much to ask!?

  11. onebiozz says:

    has science gone too far?

  12. mjrippe says:

    “Poop Alert: Your roommate just completed a nasty dump of 1258 grams. He currently weighs 103kg. Your roommate spent 23 minutes pooping”

    Not so cute anymore, is it?

  13. Adobe/Flash hater says:

    So has has anyone registered “scat stats.com” yet?
    for only $1.99 a month registurd users can get the latest scoop
    on pet poos.
    Or you could tie it in with the “I’ve fallen and can’t get up” company.
    as some sort of remote health monitoring service.

  14. Hirudinea says:

    Well I’ve always said Twitter was for shit and this just proves it.

  15. healthy says:

    i potty trained mine. best decision/effort evar

  16. CoolMod says:

    Really?!?! Lame…

  17. I hope you tweet it when the box gets cleaned also

  18. Matt Black says:

    I noticed that one of the tags for this article was “strain gauge”. It made me giggle a little…

  19. Wes says:

    “load cells”


  20. Alan says:

    But seriously… how does the device discern poop from pee? Couldn’t a cat whiz 24 grams as well…?

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