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    increase IR LED transmitter range

    how do i increase this IR LED transmitter range?

    using additional circuit?

    the details of the IR LED Transmitter are as follow :-

    Feature:
    Chip material:AIGaAs
    Emitted color:infrared
    Lens:5mm, water clear
    Low power consumption, high efficiency, low current requirement
    940nm wavelength
    Forward current:50mA
    Forward voltage: 1-1.7V
    Radiant intensity: min 20mw/sr
    Application: TV set, remonte controller, optical switches, optical encoders, smoke sensors ans so on.
    Storage temperature: -20~ +85
    Operating temperature: -20~ +75
    Max. Forward Current: 100mA
    Max. Forward Voltage: 1.7V
    Max. Reverse Voltage: 5V

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    Re: increase IR LED transmitter range

    The light what it emits with given specs is final. You practically cannot increase IR emission beyond the LED limits. Only way is to use more LED's are use suitable optics like reflectors, or Lenses at the TX and RX or both which will converge/ concentrate the available light.
    Cheers



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    Re: increase IR LED transmitter range

    i dont quite understand. can u explain a bit more?



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    Re: increase IR LED transmitter range

    practically you cannot increase the range of IR which is set to a maximum value as per the standards of manufacturing design...

    IR comes in variety which gives you different length but you cannot trim or tune it beyond the distance mentioned in the data sheet..

    You can use plastic enclosure on top of IR transmitter and restrict the transmission through a small hole instead of dispersing it in open air. So that we can concentrate the beams on on a IR receiver...
    " It is so simple to be happy,
    but it is so difficult to be simple"



    •   Alt17th February 2011, 05:25

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    Re: increase IR LED transmitter range

    you can not increase the range of IR LED, you have to go with different manufacturer for wide range ..



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    Re: increase IR LED transmitter range

    so, how do i know the range for my IR tx, because the IR i bought, doesnt provide datasheet. :(

    just the small info about the product on the 1st post.

    ---------- Post added at 14:08 ---------- Previous post was at 14:07 ----------

    so, how do i know the range for my IR tx, because the IR i bought, doesnt provide datasheet. :(

    just the small info about the product on the 1st post.



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    Re: increase IR LED transmitter range

    You don't say what range you are getting, what range you want, what optics you have, what the receiver is or what you are actually using it for. With so little information it is impossible to give a useful answer.

    Keith
    I started life with nothing and I've still got most of it left. (Seasick Steve)



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    Re: increase IR LED transmitter range

    so, how do i know the range for my IR tx, because the IR i bought, doesnt provide datasheet. :(

    just the small info about the product on the 1st post.



    •   Alt17th February 2011, 06:17

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    Re: increase IR LED transmitter range

    As pranam77 has said, for more range, which is more radiance, we must use more LEDs.
    Here is a commercial IR radiator providing up to 18 Watts/sr.
    http://www.dcnwireless.co.uk/bosch_d...tors_DS_EN.pdf
    It uses 480 LEDs to achieve its range and/or coverage.



    •   Alt17th February 2011, 06:18

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    Re: increase IR LED transmitter range

    just power ON the tx and rx.. connect a led and make it ON. when both tx and rx are close to each other (opposite to each other). Now make one as stationary and move the other away from the stationary tx.... check at what point the LED glows OFF...
    Tune the pot so that the LED is ON again and then again try to move it further away.. do this till there is no effect of tuning the POT..

    the point where the tuning of pot has no effect is the maximum distance you IR LED can operate.....
    " It is so simple to be happy,
    but it is so difficult to be simple"



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    Re: increase IR LED transmitter range

    im getting about 2-3cm range (about 1-2inch)

    i want to get bout half feet.

    im using it for direction sensor, placing at door. to know either person go out/in.

    it just a model. so i just use small box. a4 size box.



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    Re: increase IR LED transmitter range

    do you use comparator for IR????

    it depends on what IR you are using.. it ranges from 1cm to 15cms to some feets....
    " It is so simple to be happy,
    but it is so difficult to be simple"



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    Re: increase IR LED transmitter range

    no. i did not use comparator.

    im just using a simple circuit. 5v|-----vvvvv------>|------|gnd

    vvvvv = resistor

    >| = ir transmitter.

    this is for transmitter.

    for the receiver, its the same circuit. but with voltage divider. the output voltage of IR receiver will be fed to a PIC.



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    Re: increase IR LED transmitter range

    refer this circuit and see if there is any improvement

    " It is so simple to be happy,
    but it is so difficult to be simple"



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    Re: increase IR LED transmitter range

    is it the transmitter or the receiver that give specific range?

    im quite confused. is it my transmitter or the receiver that hv problem. :(

    btw, im using PIC18F452, so do i need to use the comparator?


    dont use sms kind of typing language in the forum
    Last edited by ckshivaram; 17th February 2011 at 07:55. Reason: short hand messages used



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    Re: increase IR LED transmitter range

    yes you need to tune transmitter and receiver if you dont know the range of it..
    as i have shown connect the receiver to the circuit and check what is the correct range of the IR pair and then connect it to controller.
    " It is so simple to be happy,
    but it is so difficult to be simple"



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    Re: increase IR LED transmitter range

    Quote Originally Posted by zr125 View Post
    no. i did not use comparator.
    im just using a simple circuit. 5v|-----vvvvv------>|------|gnd
    vvvvv = resistor
    >| = ir transmitter.
    this is for transmitter.
    for the receiver, its the same circuit. but with voltage divider. the output voltage of IR receiver will be fed to a PIC.
    so what value of resistor are you using ?

    Most IR LED's should easily work over several metres without any difficulty

    its a mix of both the type TX and RX diodes and how they are mounted that will determine the range
    its about time you showed us all a proper circuit so we can see what you are doing and where you may have gone wrong

    Dave



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    Re: increase IR LED transmitter range

    Quote Originally Posted by davenn View Post
    so what value of resistor are you using ?

    Most IR LED's should easily work over several metres without any difficulty

    its a mix of both the type TX and RX diodes and how they are mounted that will determine the range
    its about time you showed us all a proper circuit so we can see what you are doing and where you may have gone wrong

    Dave
    220ohms. for both transmitter/receiver.

    i'll post the proper circuit later. anyway,thanx!



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    Re: increase IR LED transmitter range

    Hi,

    You havent described your application, so I'm going to give some generic advice.

    I assume you need to transmit some kind of data, not just the presence / absence of light. In which case, *modulating* the IR signal will give you a manyfold increase in range. Use a modulation frequency of around 38 khz for best results. On the receiving side, you will now need a 3 pin IR demodulator to get back the original signal.

    Once you have a modulation in place, even if your LED is rated for 50 mA, you can actually pump even upto 500 mA, provided your modulation duty cycle is low (10 to 20%), without damaging the LED. This will give you even more range, *at least 15 to 20 feet*.

    A metal foil wrapped around the back of the transmitting LED like a funnel will act as a reflector to increase the range further.

    Added bonus of this strategy is a solid reliable operation that is quite immune to ambient light conditions.

    For any details or clarifications, please write back.

    Regards,

    Anand Dhuru



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