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You are here: Home / Topics / Automatic bidirectional visitor counter using 8051 microcontroller (AT89C51)

Automatic bidirectional visitor counter using 8051 microcontroller (AT89C51)

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Microcontroller › 8051 › Automatic bidirectional visitor counter using 8051 microcontroller (AT89C51)

  • This topic has 4 replies, 3 voices, and was last updated 6 years, 2 months ago by Anonymous.
Viewing 5 posts - 1 through 5 (of 5 total)
  • Author
    Posts
  • April 29, 2016 at 5:25 am #4443
    sameera
    Participant

    Is the IR  sensor output must be low inorder for the microcontroller to recieve??????

    May 16, 2016 at 3:57 pm #13925
    Hammad younas
    Participant

    I have same problem with iR… But my system is not working.

    May 21, 2016 at 5:04 am #13933
    Anonymous
    Guest

    hi All, 

            its all very easy with IR to interface. As per ur topic u need 2 IR receiver and 2 IR Led. u must keep the IR led on one side with some spacing. then, place the IR receiver on the other side straight to the 2 IR led. keep the IR led always by providing 2.5V Dc. then interface ur IR receiver with the microcontroller. note: dont interface directly with the controller. u must need a op-amp to make a signal strong. give the IR receiver to the op-amp non inverting input and get the op-amp output to the micro controller. the program ur controller as per working instruction. name the IR receiver A and B. if the A cuts and the B signal cuts hence the person is getting IN. while B cuts and A signal cuts hence, the person is getting out.

    -Balaji bpa

    contact: [email protected] , [email protected]

    May 21, 2016 at 9:15 am #13935
    Anonymous
    Guest

    i will say yes. because it will be better to detect high to low output rather than low to high output using micro controller

    May 26, 2016 at 12:20 pm #13941
    Anonymous
    Guest

    xyz

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