Impact sensor

Discussion in 'General Electronics Chat' started by tjjunior, Oct 4, 2013.

  1. tjjunior

    Thread Starter New Member

    Oct 2, 2013

    I'm hoping to create a small throwable piece that, on impact, turns on an LED. A perfect example are these throwable bean bags:

    I bought one to see how it works, and while it's a fairly simple thing one of the components has me lost. Here's a photo of it:


    Closeup: [​IMG]

    It's basically 3 watch batteries (1.5v each), a circuit board, an LED, one resistor (you can see it on the other side of the LED in the photo), and the small black "blob" for lack of a better word. Any thoughts on what's under that black stuff, how it works, and/or how I might replicate something like it? It somehow senses an impact, allows current through the LED for 30 seconds, and then stops the current flow.

    Any thoughts/suggestions on what it is? Thanks for any assistance!
  2. wayneh


    Sep 9, 2010
    Unfortunately there's a custom microprocessor under that blob. To replicate its functions would require a few components and would overall be much larger.

    If you just want a couple of these things, I'd use the one you can buy.
  3. tjjunior

    Thread Starter New Member

    Oct 2, 2013
    I thought that might be the case, thanks for your assistance.