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Discussion in 'Electronic Design' started by jacub, Nov 4, 2005.

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  1. jacub

    jacub Guest

    I'm going to build simply hot-wire anemometer. It have to work width
    3,3V supply. Precision: 1 meter per second. Full scale: 0m/s to 30m/s.
    Have you any idea?
  2. John Fields

    John Fields Guest

  3. Fred Bloggs

    Fred Bloggs Guest

    Run a search through Electronic Design or EDN for design ideas by
    Woodward- he has several good anemometer designs published. The 3.3V
    limitation will have to be handled by boost power supplies on board.
  4. jacub wrote...
    You won't be able to achieve 3% precision over the whole range.
  5. Fred Bloggs

    Fred Bloggs Guest

    He wants a digital circuit anyway.
  6. Fred Bloggs

    Fred Bloggs Guest

  7. jacub

    jacub Guest

  8. Fred Bloggs

    Fred Bloggs Guest

    There was one he published just after that expanding upon the technique
    and improving the accuracy. Note that his circuits consume *lots* of
    current too.
  9. jacub

    jacub Guest

    So this method will be more precision?
  10. jacub

    jacub Guest

    Hmm. What do You think about idea with Wheatston bridge and broken bulb.
    Voltage from bridge will be passed on ADC converter.
  11. Sjouke Burry

    Sjouke Burry Guest

    At least, make it differential,one wire shielded from the moving air,
    the other not,that gives you temperature compensation,and less
    dependancy on the type of wire.Feed both wires with a current source,
    and measure the voltage difference between them.

  12. Jim Thompson

    Jim Thompson Guest

    Works with thermistors as well. I did such in my Bachelor's thesis on
    blood flow measurement with catheter-mounted thermistors (MIT/Harvard
    Med School/Peter Bent Brigham Hospital, 1962).

    ...Jim Thompson
  13. jacub

    jacub Guest

    Have You any example schematic or some materials?
  14. jacub

    jacub Guest

    The best results I should achieve when I'll use a platinum wire, but I
    have a problem to get this wire.
  15. Nichrome wire is not costly and is easily obtained. It is durable even
    when red hot, as in electric heaters.

    The disadvantage of Nichrome is that its resistance varies very much
    less with temperature than that of platinum. But you may get enough
    variation for your purpose.
  16. Jim Thompson

    Jim Thompson Guest

    I've got a schematic, but it's Germanium transistors ;-)

    ...Jim Thompson
  17. Barry Lennox

    Barry Lennox Guest

    There was the dual metal ball one that was in the Nov 95 issue of
    "Scientific American" A number of folk got good results from these,
    and claimed accuracy of a few % and resolution of better than 0.1m/s.
    However it operates off 9 volts. DC-DC switcher?
  18. We have two real ones up on eBay.

    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: email:

    Please visit my GURU's LAIR web site at
  19. IOW, if you could afford platinum wire, you could afford to hire
    somebody to tell you how windy it is? ;-D

  20. Don Lancaster wrote...
    I couldn't find them.
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