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LED bags

Discussion in 'LEDs and Optoelectronics' started by Dan O, Dec 2, 2014.

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  1. Dan O

    Dan O

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    Dec 2, 2014
  2. Gryd3

    Gryd3

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    Jun 25, 2014
    Could be anything from a cheap spring mounted around a metal post that flexes when struck to make contact to an accelerometer talking with a small microcontroller.

    To keep cost down, it is most likely a vibration switch or something similar with a 555 timer.
     
  3. Dan O

    Dan O

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    Dec 2, 2014
    Here is a couple pics, it is powered by three LR44's... I can only see the LED, and one other component that I would think is a resistor, but it is black and not color coded like a resistor...
     

    Attached Files:

  4. Gryd3

    Gryd3

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    Hard to see. Could just be a simple spring and a 555. I'm stickin with that answer for now.
     
  5. Dan O

    Dan O

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    Dec 2, 2014
    Yeah, I figured it would be a 555, but I don't recognize one on there... unless it is in a different package then I remember... I'm going to take some isopropyl alcohol to the hot glue, so I can get a better look at whats going on... thanks for the reply!
     
    Last edited by a moderator: Dec 3, 2014
  6. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    I don't think Isopropyl alcohol will do anything to hot melt glue. AFAIK you need to re-melt it.
     
  7. Dan O

    Dan O

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    Dec 2, 2014
    Maybe not, I haven't tried it yet, but when I did a Google search on "how to remove hot glue", most of the results said to use isopropyl alcohol

    http://m.instructables.com/id/Easily-Remove-Dried-Hot-Glue-aka-Hot-Melt/

    http://lifehacker.com/5676237/use-rubbing-alcohol-to-remove-hot-glue-from-nearly-anything

    http://www.doityourself.com/stry/5-tips-for-cleaning-hot-melt-glue#b
     
  8. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Freezer spray is what I use, it goes brittle and you can pick it off. But use with care and small amounts at a time.
    Adam
     
    KrisBlueNZ likes this.
  9. Dan O

    Dan O

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    Dec 2, 2014
    Ok, here are some pics with the hot glue removed, through a magnifying lamp, any clues?
     

    Attached Files:

  10. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Oh no black blob syndrome. under that black blob is an IC what it does is anyones guess.
    Adam
     
    Anon_LG, KrisBlueNZ and Supercap2F like this.
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