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Discuss [iCouchPotatoe] Your iPhone/iTouch is an Universal Infrared Remote Control at the Hardware - Hackint0sh.org; On question to jumpjack... Your lirc2ledrem can process arbitrary lirc files or only the ones ...
  1. #81
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    On question to jumpjack...
    Your lirc2ledrem can process arbitrary lirc files or only the ones generated by raw2lirc?
    What kind of hardware you need to use the generated audio file? Is an old Nokia 3650 right for use?
    You can make the IR Emitter just with 2 Leds? as you said in your tutorial?
    At which distance from the device to be controlled the emitter with 2 Leds works?


  2. #82
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    Quote Originally Posted by maxtofa View Post
    Is an old Nokia 3650 right for use?
    This forum is not related to Nokia cellphones, so please contact him directly by PM instead.

  3. #83
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    Sorry for the unappropriate question, but I'm really interested in this topic and being in Italy and not having an iPhone, i was asking if what I have now (a 3650) could be used to test the hardware for the emitter... I'm interested in using it on an iPhone and I also be glad to contribute for the development of an app.

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    No problem, but if you read the previous posts, i said that the audio output of a Nokia and an iPod Touch or iPhone are different.

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    Quote Originally Posted by maxtofa View Post
    On question to jumpjack...
    Your lirc2ledrem can process arbitrary lirc files or only the ones generated by raw2lirc?
    It should accept any LIRC file which contains RAW codes (but it must not contain TABS, only spaces).

    What kind of hardware you need to use the generated audio file? Is an old Nokia 3650 right for use?
    I'm trying to verify, through users feedback, which devices can actually use this method. In theory, ANY device supporting stereo output and WAV files should be suitable.
    So I think 3250 is NOT suitable, being it NOT stereo (LINK)
    But I didn't do any test with mono-phones.

    You can make the IR Emitter just with 2 Leds? as you said in your tutorial?
    At which distance from the device to be controlled the emitter with 2 Leds works?
    2 led for normal stereo; 1 led is enough for symetrical stereo (don't ask me why...).
    My PC can control my devices up to 4m apart. My nokia 6680 can control up to 2m apart. Don't know about other devices.

    For nokia-related question, please feel free to post in this forum:
    http://www.nokioteca.net/home/forum/...ic=117718&st=0


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    XianLi, do you think it is possible to build a small circuit which can "emulate" stereo by getting a mono input? It should actually reproduce a very simple audio: just a sine wave. I'm not so skilled in electronic... but maybe just a transistor which inverts the signal would be enough? Then I should just connect an IR led to the transistor output and an IR led to the "real" mono output... or not?

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    If you divide the mono signal and invert one channel (using a TLC272 OP-Amp) you'll get an out of phase (-180) monaural output.

    It will act like a cheap voice suppressor you can find in Karaoke systems.

    There is no way to produce a "real" stereo signal from a mono one.

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    Quote Originally Posted by XianLi View Post
    If you divide the mono signal and invert one channel (using a TLC272 OP-Amp) you'll get an out of phase (-180) monaural output.
    Well, isn't this exactly what I need?!? The same signal, but with opposite phase!
    One LED plays original signal, the other LED plays the inverted one, and together they "create" a 38000 Hz signal...?

    Or maybe I didn't understand anything of your project?

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    What I actually don't understand is which is the final waveform produced by your/Griffin's device:



    If 2 LED were connected among channels and GND, I GUESS their signals would sum one to the other, being in opposite phases; but what signal comes out from LEFT and RIGHT pin, rather than LEFT and GND or RIGHT and GND?!?

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    Quote Originally Posted by jumpjack View Post


    What I actually don't understand is which is the final waveform produced by your/Griffin's device
    Do you know the principle of an LED ?

    Anode --|>|-- Cathode

    Anode = +
    Cathode = -

    If you invert the polarity of your signal, the LED1 will block it until it goes positive again.
    Now if you put another LED2 in parallel/reverse, when LED1 will block the signal (light off), the LED2 will light up. When the state of the signal will change again LED2 will Light off and LED1 will light on.

    Audio channel Output's bandwidth on Standard Audio Chipsets (iPhone-iTouch in our case), like i said before, can't overpass 20Khz.

    So we use 2 channels together to generate the required 38Khz carrier signal.


 

 

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