IR remote control extender genius

Discussion in 'General Electronics Chat' started by Andreas, Feb 16, 2011.

  1. Andreas

    Thread Starter Active Member

    Jan 26, 2009
    68
    4
    Can anyone postulate (shed some light) as to how the following device might work?

    http://www.nextgen.us/ProductDetails.asp?ProductCode=REMOTEEXTENDERGENIUS

    It's essentially an RF transmitter module which fits in place of one of the AA battery receptacles. How does it pick up (detect) the actual coded IR signals from the handset. Does the IR circuitry emit its own "weak" RF signal which is then further amplified and sent via this module?

    Quite an interesting bit of kit.


    Thanks,
    Andreas
    _____________
    "Don't believe everything you think"
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    The statement below taken from the webpage to which you provided a link pretty much says it all.



    hgmjr


     
  3. eblc1388

    Senior Member

    Nov 28, 2008
    1,542
    102
    Monitoring the current consumption of the hand held remote control unit. When user press a button, the value of current pulses to the IR emitter diode is quite significant.

    No.

    Great idea and design by the original designer.
     
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  4. hgmjr

    Moderator

    Jan 28, 2005
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    The RF transmitter is located in the battery-shaped package that you substitute for one of the batteries.

    It senses the IR emitter output current as already described and transmits an RF version of the IR signal being emitted when you press a given button.

    hgmjr
     
  5. Andreas

    Thread Starter Active Member

    Jan 26, 2009
    68
    4
    Yes the 1st bit I knew as I also pointed that out. But I think your answer (and the chap before) needs more clarification (detail).

    So I'm going to hazard a guess at my own answer and please correct me if I am wrong.
    When a key is pressed the on-board chip generates a unique code particular to that key (let's say it's an 8 bit stream that is generated). The RF module can detect minute changes in current draw from this data stream depending how many zeros and ones it has. That is; each data stream has it's own unique current drain and this is what the RF module detects and retransmits in an RF form.

    This kind a makes sense. But then how does it know the current drain for each individual key? When you first twin (marry) the transmitter with the receiver you only need to press any one of the Keys to do this. Perhaps IR coded signals are an industry standard protocol, hmmm...

    Again, thanks for the insight.
     
    Last edited: Feb 16, 2011
  6. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
    1,758
    98
    The Apple IR remote sends the battery level with every keypress.
     
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  7. hgmjr

    Moderator

    Jan 28, 2005
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    Yes, the circuitry contained in the battery-substitute module monitors the current and simply converts the current fluctuations associated with the IR ones and zeroes to an equivalent RF bitstream of ones and zeroes and transmits the bit stream pattern to the base station where it is converted back to IR which is broadcasted from the base station as a boosted IR bitstream.

    The IR pattern that is normal emitted by the TV remote does encode the keys press into unique bit streams.

    Keep in mind that the battery module does nothing but convert the current associated with the IR bitstream into an equivalent RF bitstream which is converted from RF back to IR and rebroadcast. I doubt that the battery module and the base station attempt to interpret the bitstream.

    hgmjr
     
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