Please Help! Moisture sensor to circuit breaker.

Discussion in 'General Electronics Chat' started by Circuithittingme, Jan 6, 2016.

  1. Circuithittingme

    Thread Starter New Member

    Jan 6, 2016
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    Ok so bare with me because I am a complete philistine with no working knowledge of this stuff.

    I study at an art school, and for my interim show in a little over a week I am organising a performance which will involve a load of emaciated art students spitting down a staircase within my school. The performance will be organised so that each of the performers has a number, and they will spit as their number is called from a speaker system placed at the top of the stairs. What I would like to happen is for there to be a moisture sensor at the bottom of the stairs, which will be triggered by the large quantity of saliva, and (this is the part I am struggling with) would link to a circuit breaker at the power source for the speaker system. The sensor would therefore act as a kill switch for the performance as whole, ending it and rendering the speaker system inert for the rest of the show.

    Is this possible? If so how? and is there any form of ready made version of this which I could buy on the cheap?

    Thanks very much to who ever answers this, hope it will be entertaining and not annoying for that special someone who takes the challenge.

    Joe
     
  2. dl324

    Distinguished Member

    Mar 30, 2015
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    Your first post; welcome to AAC!

    I'd buy a leak detector (about $10US) and modify it to disable the alarm and use it to trigger a latch to disconnect the speaker or turn off whatever is driving it. Not that I in any way condone spitting; even for it's "artistic" value...
     
  3. Circuithittingme

    Thread Starter New Member

    Jan 6, 2016
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    Thanks v much dl324. Is a latch a switch?
     
  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Just use a regular lamp timer...
    That gives you a "fixed" performance time..
    I can't imagine anyone staying around for the hours it will take to have sufficient saliva to trigger whatever device you cobble together..
     
  5. Circuithittingme

    Thread Starter New Member

    Jan 6, 2016
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    I don't know, I've done this a few times and you'd be surpised how much saliva builds up on the floor with even just a few people spitting. I'll do some research and see what I can do.
     
  6. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    :rolleyes: Artists... o_O
    Whats the point/message or whatever of your "show"?
    "Lives of Spitters Matter" ?
    "Art is just about used up" ?

    I only mentioned a "fixed time" because #1 is simple and #2 I can't imagine how long it could possibly take for a group of people spitting a "distance" and having enough "accuracy" to get that spit to actually become a "localized wet area".. But I've never sat around with multiple people spitting on anything.. o_O
    I can't believe I'm actually posting on this.. :(
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Evidentally all spitting done unclad :eek:?
    Max.
     
  8. dl324

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    I was thinking more along the lines of a flip flop. You could hack the sensor to access the signal that triggers the alarm, or you could use the alarm output to trigger the latch.

    I'd put the leak detector in a tray so it wouldn't take much saliva to trigger. You can "control" activation time by having people intentionally miss the tray.
     
  9. Circuithittingme

    Thread Starter New Member

    Jan 6, 2016
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    Ok thanks dl324 I'll give that a try. The timer version would work but only if I was trying to fake the spit ending the performance as a whole. the bottom of the stairs is a slope so the saliva all stays pretty localised to one area anyway. Not so much a point mcgyver as an interest in the affect of it/how scoring something works/whether a disrespectful act like spitting can be emptied of its content as such. I understand if its not of interest to you, nor do I think it is particularly 'deep' or 'meaningful', its more a collection of interests for myself, which I am experimenting with and following, much as you do on this site with circuits and their potential.
     
  10. Circuithittingme

    Thread Starter New Member

    Jan 6, 2016
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    everyone will be fully clothed too, but perhaps an idea for next time;)
     
  11. dl324

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    Or you could fake it and have a mechanical switch that someone could use to force the speaker to be disconnected at the appropriate time.
     
  12. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Or, do it chemically. Use the lithium metal from a battery and have it catch fire when wet and have that burn through the power cable.
     
  13. Nathaniel Zhu

    New Member

    Oct 16, 2015
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    uhhhhhh. Maybe do some sort of trampoling thing so that when the spit builds up, the "trampoling" gets pulled downwards into a flame that burns up the trampoling and then all the spit sloshes down and causes short circuits in all your electrical devices.

    That would be HILARIOUS! but you'd need a lot of spit for that.
     
  14. GopherT

    AAC Fanatic!

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    Will you have tested everyone for Hep'C and tuberculosis before the spitting begins?
     
  15. dl324

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    I'd be more worried about HIV/AIDS...
     
  16. Nathaniel Zhu

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    Oct 16, 2015
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    HIV isn't transmitted by Saliva. Only Blood to blood contact. Unless the crowd is spitting and then realize they all want to have a kissing orgy with severe gum bleeding gingivitis, they're fine.
     
  17. dl324

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    I wonder why police are so worried about getting spit on and why, IIRC, China started cracking down on people spitting in public?
     
  18. Nathaniel Zhu

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    Oct 16, 2015
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    Yeah China is crazy about HIV people. They're terrified about HIV+ people. My mom too, but their fears are unreasonable and based on decades old misconceptions.

    The police in the US aren't medical/biology trained. You don't even need a degree to become a policeman. There's a lot of fear and ignorance in their heads
     
  19. dl324

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    Now I know there are no documented cases where HIV was transmitted through saliva, but that doesn't mean I'd want to be around an HIV positive person who spits...

    While I was researching this topic, I came across an article where an HIV positive man in Texas was sentenced to 35 years in prison for spitting on a police officer. Since he was charged for assault with a deadly weapon, he has to serve half of his sentence before being eligible for parole. Probably better for society anyway; he was a habitual offender.
     
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