Help with a motion detector.

Discussion in 'The Projects Forum' started by Metalica, Dec 14, 2018.

  1. Metalica

    Thread Starter Active Member

    Aug 1, 2010
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    Ok the module is this.
    https://www.epal.pk/product/rcwl-0516-microwave-radar-human-inductive-motion-sensor/
    Now i want to power it with 4 AA batteries that makes 1.5*4=6 Volt
    here are some specs when it detects motion.
    It outputs 3.2-3.4V when motion detected at one of its pins.
    Output 100mA current is max output.
    now what i want is to take that output and feed it to a very simple 1 transistor circuit that is powered by the same 6 volt batteries set that can give me 6 volts with more amps and Should be as simple as possible to achieve simplicity and less space.
    Thats all.
     
    Last edited: Dec 14, 2018
  2. ericgibbs

    Moderator

    Jan 29, 2010
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    hi Met,
    How many more amps are required and what is the load.?
    Eric
     
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  3. Metalica

    Thread Starter Active Member

    Aug 1, 2010
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  4. ericgibbs

    Moderator

    Jan 29, 2010
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    hi,
    A single transistor or low power MOSFET would do the job.
    What do you have in your bench work stock of semiconductors.?
    E
     
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  5. Metalica

    Thread Starter Active Member

    Aug 1, 2010
    40
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    I have a bunch of C828 NPN transistors.

    I want it to create high decibel sound

    What if i need to power a larger buzzer with more dB sound like 130db and 2 watt specification.
     
    Last edited by a moderator: Dec 14, 2018
  6. ericgibbs

    Moderator

    Jan 29, 2010
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    hi,
    The C828 has a 100mA max peak collector current limit, continuous at 50mA.
    Which sounder do you have.?
    E
     
  7. ericgibbs

    Moderator

    Jan 29, 2010
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    I would choose a MOSFET with a low Vgate voltage, to suit the 3V output.
    E
     
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  8. Metalica

    Thread Starter Active Member

    Aug 1, 2010
    40
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    Ok dear what i am trying to create is a product that can be used as a burglar alarm with high decibel sound so please guide me for getting a good buzzer for this purpose and feed it through some circuit....
     
  9. ericgibbs

    Moderator

    Jan 29, 2010
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  10. Metalica

    Thread Starter Active Member

    Aug 1, 2010
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    Ok Good now design me a circuit that can drive this i can upgrade the 6 volt supply to 12 volt and a good battery.
     
  11. ericgibbs

    Moderator

    Jan 29, 2010
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    hi,
    The uWave sensor can operate from 12V, so can the siren.
    All you need is a MOSFET, rated at say Id=1Amp and Vgs of < 2V. say a SI2300.
    A 1k resistor from uWave out to the MOSFET Gate.

    Sketch out and post a circuit, we can check
    Add power line decoupling, say a 47ouF and 100nF caps
    E
     
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  12. Metalica

    Thread Starter Active Member

    Aug 1, 2010
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    Sir please help me i need a 6 volt design for this system with a 6 volt buzzer with 130 db sound and 200mA specs.
     
  13. ericgibbs

    Moderator

    Jan 29, 2010
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    hi,
    The sensor will work from a 6V supply, so find a 6V buzzer with a 130dB output and use the same MOSFET type I posted.
    E
     
  14. visionofast

    Member

    Oct 17, 2018
    51
    4
    As an additional info, notice that these uw modules may even detect motions behind the walls,and are sensitive to any kind of motions unlike the PIR sensors that are mostly snesitive to movement of thermal-emiting objects (like human or animal's body).
     
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  15. Metalica

    Thread Starter Active Member

    Aug 1, 2010
    40
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    pir-sensor-alarm-circuit.png
    I need to create a simple PIR alarm as above but instead of a buzzer i want to use this https://www.alibaba.com/product-det...m=a2700.7724857.normalList.175.62396044LehupM
    The website has mentioned these specs for it.
    DC12V/24V
    Rated current 3A/2A
    please some one guide me for a suitable but a one transistor solution to this problem. the operating voltage will be a 12v bike battery instead of a 9v as circuit shows above.
    Or
    If some one has a better option to use instead of the siren i posted in the link please share that.
    Thank you.
     
  16. ericgibbs

    Moderator

    Jan 29, 2010
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    hi Met,
    The solution in post #11 is still suitable, ensure the MOSFET can handle 3Amps.
    E
     
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  17. Metalica

    Thread Starter Active Member

    Aug 1, 2010
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    Well thats a good option but i can't find Si2300ds easily please specify another MOSFET which will be easily avialble.
     
  18. ericgibbs

    Moderator

    Jan 29, 2010
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    hi Met,
    If you give an idea on what types are available in your area, we could select one or two.
    E
     
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  19. LesJones

    Well-Known Member

    Jan 8, 2017
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    How about an FDS8896

    Les.
     
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  20. Metalica

    Thread Starter Active Member

    Aug 1, 2010
    40
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    But the problem is that i want to do it only using BJTs, please no MOSFETs since i can't find them or i am not comfortable with them.
     
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