pressure based alarm system

Discussion in 'The Projects Forum' started by venti, Feb 19, 2008.

  1. venti

    Thread Starter New Member

    Feb 19, 2008
    1
    0
    hey guys,
    i'm working on a senior design project and i'm kind of stumped on this part of it. we have to design a ventilator for use in the developing world; part of our design is that when the pressure coming out of the device is too high, an led will light up - eg if the pressure is above 7cmH2O, a light will go off. I think we're going to have to start by buying a pressure sensor that converts pressure into voltage, but i have no idea what this circuit would look like. would appreciate any help!!!

    thanks!
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Digikey has a number of pressure transducers that would fit your requirement. They are pricey little devils however.

    hgmjr
     
  3. stapler

    New Member

    Feb 26, 2008
    1
    0
    Hello Venti
    May I suggest you use a water level switch from a dishwasher or clothes washer.7cm of water is quite near these working levels and would be very cheap and quite reliable.
    Most of them are adjustable and will have normally open and closed contacts.
    It would be very easy to pick one up from a scrap yard or a machine that has been dumped somewhere.Email if you need a picture of one.
    Regards
    stapler
     
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