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Remote control – 1: the receiver

6 commenti Pubblicato da jumpjack su 22 maggio 2008

== 1 == BUILD THE RECEIVER

a – cut the ending part of the headphone cable (i.e. , remove headphones)

b – connect the IR leds in place of the headphones (one led per channel)

That’s all, now you have an IR receiver. (Note: images refer to first attempt with a single LED connected once to a channel and then to the other till the correct one was found).

^^ INDEX

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hardware, Infrarossi

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6 risposte a Remote control – 1: the receiver

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Andrew G 2 ottobre 2009 alle 23:21
Does this say to use a IR EMITTING LED? Opposed to an IR DETECTOR? For me the detector works as a mic but not the emitter. Which to me, logic shows should be true but this i think says to use a emitter as a mic.

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- jumpjack 3 ottobre 2009 alle 11:52
  that’s the point!
  An EMITTER LED can work both ways! I.E., if you point your remote control to it and press a button, internal resistance of the transmitter LED will change accordingly, just like a microphone changes its internal resistence when receiving sound. Have you ever tried connecting a microphone to earphone port? You’ll hear sound coming from it! And if you connect your earphone to microphone port… it will act as a microphone!
  For LEDs, its just the same.
  
  Unfrotunately, a transmitter LED used as receiver has a very short range (only a few centimeters), but that’s all you need to sample your remote. If you want to use it to control a device with the remote, you’ll need an amplifier.
  
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  - Andrew G 4 ottobre 2009 alle 23:46
    WOW! I never knew that! That amazed me! Now i understand this step a little more. I don’t have a ground so i just connected it to the other ear piece wire and t seemed to work out fine for me. Is that okay? (I’m not sure because i haven’t gotten it to Emmit properly yet.)
    
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    - jumpjack 5 ottobre 2009 alle 12:41
      What do you mean with “I don’t have a ground”???
      The “ground” is the copper wire surrounding the main wire connected to each earpiece.
      I mean, you have two cables, each one connected to an earpiece.
      Each cable is made up of an internal insulated copper wire surrounded by uninsulated copper wire, which is the “ground”.
      You can see it here:
      http://www.planetmobile.it/jumpjack/immagini/cable-end.JPG
      
      I connected together the two grounds of two cables, but actually maybe it’s not necessary, they are already connected inside the circuitry.
      
      For the receiver, I found you can conncet the led both among ground and white-wire, or among two white cables.
      
      Instead, you must connect the LED(s) among white cables for the transmitter.
      
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      - Andrew G 5 ottobre 2009 alle 23:26
        Then that means that the way my transmitter is set up should be ok. By not having ground i mean one wire comes out of the right ear’s cable and one for the left ear’s cable. I can plainly see your ground wire but I believe mine does not have a ground.
        
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