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Does anyone know how to make a stereo mini to IR adapter?

 I want to use my iPod touch to control my home theatre, but I don't want to pay 50 bucks for an IR dongle. Seems like all you need is a stereo mini plug and an infrared LED anyway.

Would really appreciate it if someone could show me how to make an IR dongle like RedEye's mini.

Picture of Does anyone know how to make a stereo mini to IR adapter?
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akula1696 years ago
Actually the fourth ring is for the microphone connection: http://pinouts.ru/PortableDevices/iphone_headphone_pinout.shtml The mic connection used to "read" IR signals for learning unknown remote codes. From reading the redeye mini's, is sounds like the have a little extra beyond the IR transmitter and receiver LEDs in there. 1) A microprocessor to record at a higher frequency rate than the mic alone would allow. 2) some sort of capacitor array that harvests off the jack power so it can burst when needed to send higher powered IR output (increased range). All-in-all, a bit outside my reverse engineering skills. I'm eagerly awaiting for more information about the insides of this product, as I can't justify spending $50 on something that should cost around $20 (especially considering there's probably only about $2.68 worth of parts in there) To get started though - I did plug my headphones in to my phone and opened ThinkFlood's RedEye iPhone app. It is obviously doing some device discovery checking, as the earbuds are emitting high pitched audio with some clicks in there. I'm sure its waiting for the receiver to recognize this signal before the app will let you start configuring code for the "device".
jeff-o7 years ago
Ah, this is ripe for a homebrew solution!  Well, maybe...

The first thing to notice is that it uses a four-pin connector rather than the standard three-pin.  It could be that the fourth pin is being used to "authorize" the dongle so that the application only works with their hardware.  But, that's only a guess.  If that is the case, good luck cracking it!

The IR LED itself is probably driven from audio signals generated by their program, which either directly drive the LED or are converted by a small microcontroller into signals for the LED.

Perhaps I'm overthinking things, but If I were them I'd make sure that copycat manufacturers couldn't just build a dongle for $2 in some factory in China and use it with my app.

It may require someone to buy one, tear it apart, and figure out how it works.
Re-design7 years ago
THe ir dongle would supply the correct power and also the correct coding to control the other things.  Without knowing that info it is impossible to consider building one on your own.  You might be able to find it on the net.