Increase ir led range

Discussion in 'Embedded Systems and Microcontrollers' started by swapnil_revankar2004, Feb 16, 2013.

  1. swapnil_revankar2004

    Thread Starter New Member

    Feb 16, 2013
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    Hi . i am working on laser tag gun project . i wanna increase my ir led range .i am currently getting a range of around 100 feet approximately but i wanna increase the range to about 500 feet or more. I am using a normal remote ir led and magnifying lens which helped me to achieve a 100 feet range . The ir led is provided with a 5 volts power through arduino . Plz help ...Thanks
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. tubeguy

    Well-Known Member

    Nov 3, 2012
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    What is the current supplied to the IR LED?
    What are the specs for the LED?
     
  4. swapnil_revankar2004

    Thread Starter New Member

    Feb 16, 2013
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    The current supplied is 5 volts it is supplied through arduino . and the specs is double convex lens 40mm diameter and the focal length is 115 mm .
     
  5. tubeguy

    Well-Known Member

    Nov 3, 2012
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    Voltage and current are 2 different things:
    This might help:
    http://www.allaboutcircuits.com/vol_1/chpt_2/1.html

    If you are driving the LED from 5 volts you will need to limit the current through the LED (if you are not already doing that.)

    Can you please post your circuit?
    And the specifications for the LED -

    I'm not an optics guy, maybe someone can shed some light on the lens ;)
     
  6. swapnil_revankar2004

    Thread Starter New Member

    Feb 16, 2013
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    Hi
    I did limit the current earlier with a 100 ohms resistor but then my range was about 50 feet.i did read in one forum that if we increase the power to led the range increases ,so i did that and was able to achieve a range of about a 100 feet.The ir led that i am using is 940nm led .
     
  7. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    You still have not provided the specs of the IR led.
    A data sheet would be helpfull.
    Also a drawing of the optical setup would be helpfull.

    Bertus
     
  8. swapnil_revankar2004

    Thread Starter New Member

    Feb 16, 2013
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    Hi

    First id like to thank u for replying to the post.I have attached a drawing of the specs .
     
  9. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Are you sure you are in the focal point of the lens?
    Have a look at this image found at the ronja projects site:

    [​IMG]

    There is also a nice page about testing the optics:
    http://ronja.twibright.com/benchpress/

    Bertus
     
  10. swapnil_revankar2004

    Thread Starter New Member

    Feb 16, 2013
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    Hi
    Thnks for the post .After reading it what i understand is, i have to place the led at a point where the image gets blurred .Thats not what i have done now ,i have placed the led at point where the image is clear .so will try that ..Thank u ..
     
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