Angle sensor

Discussion in 'General Electronics Chat' started by Dritech, Feb 21, 2014.

  1. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
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    Hi all,

    Is there a sensor / module which outputs a analogue voltage with angular change? I want to use it for monitoring an object which will rotate 180 degrees. The reason for not using a potentiometer is because I am limited with space.

    Any kind of help will be appreciated.
     
  2. studiot

    AAC Fanatic!

    Nov 9, 2007
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  3. russ_hensel

    Well-Known Member

    Jan 11, 2009
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    how about a trim pot, about 1/4 inch around.
     
  4. bwilliams60

    Active Member

    Nov 18, 2012
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    Can you be more specific about size and space available as well as voltage and amperage specifications?
     
  5. Ian Rogers

    Member

    Dec 12, 2012
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  6. BillB3857

    Senior Member

    Feb 28, 2009
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    How about using an accelerometer. As an example, MXP7205VF will measure static acceleration (gravity).
     
  7. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    Ebay has tiny $4 accelerometer modules that output 3 linear voltages for the 3 axes. They have three output wires, marked; X Y Z.

    To compute rotary angle you will need to measure two axis voltages and do some simple sine/cos math.
     
  8. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
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    Hi,

    Thanks for the replies. The tutorial in the link below shows how to use 2 axis for measuring the angle, but the problem is that apparently one can only monitor an angle less than 90 degrees. Is this true? and how accurate can I get?

    Thanks in advance.
     
  9. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
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  10. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Second this! How about a photo of the location where you are trying to mount an angle sensor? It may open up other possibilities.

    Ken
     
  11. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    The analogue accelerometers output a voltage representing the G force of gravity. The voltage is centred. (For example) 2.5v for 0G, and 1v for +1G (upright) and 4v for -1G (upside down).

    So the voltage will show all angles not just 0-90', but you need two axes and work from sin/cos of the two voltages.

    It sounds tricky but is very simple in software. There are tons of "DIY accelerometer inclinometer" projects you could google.
     
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