Step 2: Build a cat sensor

We want to detect when your cat is gets in the bed and when she leaves the bed.
The cheapest way to do so is with a momentary switch. Most switches you can pick up at an electronics supply store are much too small; we'll need to increase the surface area of the switch and make sure that the weight of the cat bed itself does not actuate the switch.

Here's a quick way to do so:

  • Solder two stranded wires onto the terminals of your momentary switch. Allow enough wire length to reach from the cat bed to wherever you plan to stash your computer.
  • Cut a strip of foamcore (12"x2" maybe), score it in the middle, then fold in half at the hinge. The upper half will be your lever. Cut a switch-sized hole in the bottom part. Hot glue the switch in, then glue a supporting piece of foamcore underneath to give more support to the switch.
  • To add some spring force to the lever that keeps it open normally, cut some short pieces of "Foamies" foam strip, or some other springy material, and glue into open end between lever and base.

Then slide the switch underneath your cat bed. The switch should not be actuated by the weight of the bed alone, but should be actuated whenever you apply light pressure with your hand in various parts of the bed.

  • Tom Igoe shows how to detect a cat using Force Sensitive Resistors mounted between two plates of thin plywood in his book Making Things Talk.
<p>Will this make a cat twitter?</p>
Like the real twitter birds <br>http://www.mediabistro.com/alltwitter/real-birds-tweet_b31976 <br>
This instructable is AWESOME... only if I had a cat.
agreed :3
i second that :3
thirded =3
fourth...ded :3
sixth....ded :3
seventh....ded :3
fifth...ded :3
just letting other people know, the second image was made with Fritzing it's a great editor and has a lot of different uses
Haha! i love it!
This is What I was looking for! thank you!!<br /> ...<br /> &nbsp;is there any way you could post the code in a txt file or something?<br /> I find this really confusing!<br />
Ive never messed with Arduino baords before, let alone the software. Is it possible to have a sensor set up for sound or motion so you could place another one around the food dish, scratching post, or even the literbox. If you're going to give your house pet the ability to Twtter, why not let them Twitter about everything they do?
yaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<br />
Way awesome! <br />
awesome but fu**ing pointless but still mega cool :)
lol i wonder what if the new version of white and nerdy instead of making a webpage for his dog he made a twitter for his cat
From the title,I almost thought it was a joke,but that is awesome. couldn't you even make a running web cam to see video? I don't have a cat, but this still sounds like fun.
kittys now twitters... cant wait for animal planet to catch on
I'm almost done doing this for my dogs. Thanks for teaching me this.
I am sure that ur dog will love his new powers!
I get an error: "The constructor Twitter(String,String) is undefined" Any ideas? The jar file is in the code directory. Thanks!
this works with my dog odie too, wich is great cuz he is always on his be :P
Twitter has died.

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