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  • EEVblog #191 – Mouse Trap Triggering

    Posted on August 1st, 2011 EEVblog 10 comments


    What’s the easiest way to electronically trigger a mouse trap? Dave has an idea… Just don’t ask why, OK, Dave doesn’t know either…

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    • Nick

      Another, more elegant, solution would be to catch your house mice first, mark them with RFID tags and release them again (very sporty, isn’t it?). Then, all it takes is use a simple RFID reader to activate the trap. Additional bonus: you don’t catch your neighbor’s mice or other rodent whatsoever.
      It’s more elaborate method than the heating resistor approach, but could easily lead to a 1,5 hours EEVblog!!
      Nevertheless, great idea and nice tutorial. I wonder if anyone has ever looked at the humble resistor’s datasheet before.

    • adam lumpkins

      dave, I did some work with graphite It works great as an ignter….. there are many different sizes. I had some luck useing them as resistors just thought i would throw that in there

    • John

      Ahaha, even the end credits got fed up with Dave’s babbling.

      “I just wanted to show some things on resistors… AAAND CUT!”

    • Ondre

      Hehehe, good one Dave! Totally reminds me of my first experiments with electronics 15 years ago when I built a time fuse for firecrackers! I used copper-constantan wire, which could be wound easily around the fuse of the cracker, instead of a resistor.
      Needless to mention that the actual timer was based on the humble 555. All slapped together in a tiny tin can, BIG FUN!

    • http://yyao.ca/ Yi Yao

      Man, sounds like someone’s asking Dave for help for their homework…

    • WestfW

      A solenoid based approach would make “reload” a much simpler operation. Which may or may not matter… There used to be a board we sold that was laid out to have a series of resistor-sized fuses between the board and some cable-connected daughtercard. We discovered that using small-values resistors instead of the (expensive!) fuses resulted in an additional feature – you could smell them burning after an overcurrent event; a sort of “olfactory failure indicator”…

    • WestfW

      BTW, this has particular application to spring (or rubber) powered, electronicaly triggered parachute ejection for water, model, and amateur rockets. To increase your comfort level, you can one of the low-melting-point, extra-high-strength polymers for the string (ie “Spectra”) Watch your knots, though. When you’re on the wrong side of a powerful spring is a bad time to notice that polymer string is “slippery.”

    • http://www.vk6mrg.webs.com VK6MRG
    • Kodon

      You gotta be shittin’ me.
      I’m sorry Dave but your blog is no good anymore :D

    • Frank

      Shape memory alloys would make a good resetable electronic trigger…

      http://www.musclewires.com/