ultrasonic motion detector

Discussion in 'The Projects Forum' started by PANSONNIC, Jan 4, 2009.

  1. PANSONNIC

    Thread Starter Member

    Jan 4, 2009
    15
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    Can anyone help me on designing a circuit board that will detect motion using an ultra sonic sensor that will detect at a distance off around 15meters. I would also like to put a time delay on, when detection is sensed . I would like to use a PIC16F628 microchip or equivalent and a 555 timer. I have tried to get boards to work but have had no luck. Any suggestions will be much appreciated.

    Many thanks

    Pansonnic
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. PANSONNIC

    Thread Starter Member

    Jan 4, 2009
    15
    0
    Hello,

    Thankyou for your quick response.

    Would I be able to use a swictching circuit that uses a PIC16F628 microchip and change the switch for a ultrasonic sensor or is there more to it than that?

    pansonnic
     
  4. bertus

    Administrator

    Apr 5, 2008
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  5. italo

    New Member

    Nov 20, 2005
    205
    1
    A 2 lm555 one is the source running around 37kc pushing a 100 Ω speaker and the other is an lm555 with a speaker 100Ω tied as a one shot to pin 2. I actualy biult this thing ages ago.
     
  6. PANSONNIC

    Thread Starter Member

    Jan 4, 2009
    15
    0
    Is that using the same PIC16F628 Microchip? What im tring to acheive is :- when the sensor senses movement, it triggers a timer that is programmed using the PIC16F628 microchip. The timer will be set at varied itervals.

    Am I going about this in the correct way?

    Many thanks

    Pansonnic
     
  7. bertus

    Administrator

    Apr 5, 2008
    15,645
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    Hello,

    The text with the 16f628 says make a pulse on ra1.
    The detector will "hear" the reflected signal, the distance is D=170 x t.
    You want to "see" 15 meters, the time will be 15/170 max 88 msec.
    If you "see" an echo within these 88 msec , there is an object present within range.

    Greetings,
    Bertus
     
  8. PANSONNIC

    Thread Starter Member

    Jan 4, 2009
    15
    0
    Thankyou for your time. I will give it another go. hopefully I will get it working this time.
    you have been a great help

    Many thanks

    Pansonnic
     
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