digital display for magnetic field

Discussion in 'The Projects Forum' started by pratapkollu, Mar 10, 2007.

  1. pratapkollu

    Thread Starter Active Member

    Dec 13, 2006
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    0
    Dear Members
    I designed a magnetic sensor for navigation purpose(2d-compass). The output of the sensor is in form of analog voltage . I want to add a digital display(for displaying corresponding magnetic field). The sensor output for zero magnetic field is zero volts, so now it must show zero Oersteds in digital display. One more example: if magnetic field is 1 Oe, output voltage is 10V, Now I want 1 Oe digital display instead of 10 V analog output.
    If any one has idea about this module please do help me
    Thanks and regards
    Pratap

    ------------------------------------
    PRATAP.KOLLU, Ph.D. Scholar
    Division of Materials Science and Engineering,
    Engineering building # 1
    Chungnam National University(CNU),
    220 Gung-dong, Yuseong-gu, Daejeon 305-764,South Korea.
    Phone :+82-42-8216227, <snip>
     
    Last edited by a moderator: Apr 30, 2010
  2. ashokcp

    Active Member

    Mar 8, 2007
    50
    2
    A 3 1/2 digital panel meter display could be used for this purpose. They are generally 200mV or 2V full scale, meaning the readout will be 1999, for 199.9 mV / 1.999 V input respectively. In your example, you can use a voltage divider that gives 0.1V for 10V input if you are using 200mV panel meter, The display would be 1000. The panel meter would also come with an option for the decimal point selection through jumpers. You can fix the decimal point by inserting the correct jumper on the 4th digit (Most significant digit), which should read 1.000 for your 10V input. For zero, it would read 0.000. If you want to construct one, then you can use ICL7107 (3 1/2 digit LED readout) and ICL7106 (3 1/2 digit LCD readout).
     
    Last edited by a moderator: Apr 30, 2010
  3. beenthere

    Retired Moderator

    Apr 20, 2004
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    It would be most helpful if you can state the magnitude of the field in Oerstads, and the precision of the readout.
     
  4. pratapkollu

    Thread Starter Active Member

    Dec 13, 2006
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    0
    For Zero Oersted (Oe) of Earth's magnetic field the output of the sensor is Zero volts (dc) , for -1 Oe, output is -10 V and for +1 Oe its +10 V.

    Thnx for ur reply
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
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    If that is your full range, 0 to +/-10 VDC, what is the precision? How small a change must you be able to distinguish?
     
  6. pratapkollu

    Thread Starter Active Member

    Dec 13, 2006
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    full range is from -10 V to +10 V , it must be abe to distinguish 0.01 Oersteds
     
  7. pratapkollu

    Thread Starter Active Member

    Dec 13, 2006
    42
    0
    thnx for ur reply
     
  8. ashokcp

    Active Member

    Mar 8, 2007
    50
    2
    BTW, if you use a 200 mV panel meter with the divider of 100:1, (0.1V to meter when you apply 10V from your sensor), decimal point on most significant digit, your meter can read from -1.999 to +1.999, for your sensor input from -19.99 Volts to +19.99 Volts. The meter reading will be in Oersteads (heard of it in good old days!). The meter input impedance will be very high of the order of 1000 MOhms (for the 200mV version only), and, you will have to ensure that your divider do not load your sensor.
     
  9. pratapkollu

    Thread Starter Active Member

    Dec 13, 2006
    42
    0
    thnx for ur reply
     
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