Infrared Range

Discussion in 'General Electronics Chat' started by asimraufawan, Oct 18, 2008.

  1. asimraufawan

    Thread Starter Member

    Jul 4, 2008
    29
    0
    Hello everyone,

    While using IR LED & an IR reciever how can we determine
    the range by using phisically both the devices ,i want the range
    of minimum 10 metre but it gives only 1 metre when i checked it by
    simply given the frequency between 30K to 40KHz to the IR lED &
    power to the reciever.
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    It sounds like you will need to do at least a couple of things to increase the range. You need to up the intensity of the IR LED transmitter and also increase the sensitivity of the receiver.

    How about posting the schematic of your circuit so that we can see for ourselves where the circuit can be improved.

    hgmjr
     
  3. asimraufawan

    Thread Starter Member

    Jul 4, 2008
    29
    0
    i will provide the schematic later but for now at the tramitter side
    i add the switch circuit by including the transistor but how could i improve the
    sensitivity of the reciever as it is a three terminal device eith VSS GND & output pin
    the output of the reciever is sent to 555 monostable circuit when the reciever
    recieves the data the led blinks.
     
  4. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    If the reciever is the fully integrated type, then there is nothing you can do electrically to improve it. The rest of the improvements must be done optically. So, increasing the power of the emitter, decreasing the emission angle, using a lens to focus the light on to the reciever.

    Steve
     
  5. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    asimraufawan,

    Scuabasteve_911 has a good point.

    Can you provide us with a part number for the receiver device so that we can see what its characteristics are?

    hgmjr
     
  6. asimraufawan

    Thread Starter Member

    Jul 4, 2008
    29
    0
    The actual problem that i have faced too is that there is no
    part number printed on the reciever device i bought it from
    a local radio store i assumed some of the characteristics from
    the vishay recievers .
     
  7. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    You cannot design anything properly without specifications, otherwise you're just tinkering until it works. Sometimes it is a quick and dirty route that works, other times, you end up making wildly foolish decisions based upon no data.

    Steve
     
  8. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    You would be far better off if you would set the IR emitter and IR receiver aside and obtain a new receiver and a new emitter for which you can find a datasheet.

    It is confusing enough to design with any component for the first time without compounding the effort by having to guess at the devices operating parameters.

    hgmjr
     
  9. karthik_dm

    Member

    Oct 16, 2008
    27
    0
    IR LEDs have a maximum range of around 6 meters only..how ever u can improve the range to 10 meters. i suggest not to design the IR transmitter using the multivibrator like 555 IC. i found them providing lower range. instead use any of the remote modules used for DVDs, TV remotes. open the remote control and remove the PCB.then after short any of the keypad switch of the remote so that the remote starts transmitting IR signal continuously..use TSOP 1738 3-pin IR sensor at reciever end..
    i'll post u the circuit later......
     
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