[Announce] Pierogi - a universal infrared remote control app - Page 78 - maemo.org

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	Estel	10-20-2012 , 10:40 AM
	Posts: 3,842 \| Thanked: 5,617 times \| Joined on Mar 2011	#771

Originally Posted by Fallingwater

I'm thinking of cracking open my N900 yet again and swapping out the LED for something a bit more useful.

Then you will run into problem of too low amount of power, to drive more omni-directional diode - it may work, but for a change, you will end up with beam of ~70 degrees coverage, but requiring to be 20 centimeters from receiver

I have tried that myself, once (also putting diffusing lens from old remote, in front of N900's one), and it just won't work. Only one feasible way is to build small IR blaster/repeater, which gets commands from N900's IR transmitter, and repeats them using powerful beam. (this way, you build powerful IR cheaply, that can still make use of awesome programs like Pierogi).

/Estel

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Cue	10-20-2012 , 03:03 PM
Posts: 839 \| Thanked: 814 times \| Joined on Nov 2009	#772

Originally Posted by Estel

Then you will run into problem of too low amount of power, to drive more omni-directional diode - it may work, but for a change, you will end up with beam of ~70 degrees coverage, but requiring to be 20 centimeters from receiver

I have tried that myself, once (also putting diffusing lens from old remote, in front of N900's one), and it just won't work. Only one feasible way is to build small IR blaster/repeater, which gets commands from N900's IR transmitter, and repeats them using powerful beam. (this way, you build powerful IR cheaply, that can still make use of awesome programs like Pierogi).

/Estel

what is the highest frequency for pierogi?
Maybe replacing the LED with an optocoupler and wiring an IR LED on the back cover connected directly to the battery is an alternative. Would high frequency signals get destroyed?

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	Estel	10-20-2012 , 03:18 PM
	Posts: 3,842 \| Thanked: 5,617 times \| Joined on Mar 2011	#773

AFAIK N900's IR diode's (+) voltage is connected with battery - the problem is with element after (-) side of diode (can't remember name now), which got pretty low limit of current passing.

mini Ir repeater, wired inside N900 with bigger cover (aka mugen one), could make it possible to put everything inside device. Still, it would require pretty nifty miniaturization, and would rather require single battery (no dual-scud + ir repeater inside, sadly, unless you can prepare it from really micro components, and solder under microscope).

/Estel

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sixwheeledbeast	10-20-2012 , 03:35 PM
Posts: 1,379 \| Thanked: 1,918 times \| Joined on Apr 2010 @ St. Helens, England	#774

This is worth a read

Also don't forget

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Last edited by sixwheeledbeast; 10-20-2012 at 03:43 PM.

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Copernicus	10-20-2012 , 03:39 PM
Posts: 906 \| Thanked: 1,728 times \| Joined on Dec 2010 @ Dayton, Ohio	#775

I think the easier solution would be to do what iPhone & Android folks are doing, create an IR dongle of some sort, and send the commands from the phone to the dongle (via wifi or bluetooth or whatever). I don't know how much work this would take, but there seem to be plenty of folks selling products of that sort...

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	Estel	10-20-2012 , 03:41 PM
	Posts: 3,842 \| Thanked: 5,617 times \| Joined on Mar 2011	#776

But that require dedicated hardware, able to receive commands over bluetooth/wifi. IR repeater can be build very cheaply, if not free (when using components scavenged from old devices/other projects).

not to mention, that our IR transmitter isn't becoming totally obsolete, as with sending commands over bluetooth/wifi

/Estel

// Edit

From sixwheeledbeast's link - this post seem to be conclusion:
http://talk.maemo.org/showpost.php?p...7&postcount=21

Although, I don't know, what it mean in practice, it's not my area of expertise (yet). Does he mean, that we can just replace resistor by ones with 1/2 or 1/4 resistance and it will work with higher current (not voltage) flowing through diodes (= more power, or possibility to insert better diode), or not?

sixwheeledbeast, what you understand from that post?

Last edited by Estel; 10-20-2012 at 03:51 PM.

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Cue	10-20-2012 , 05:17 PM
Posts: 839 \| Thanked: 814 times \| Joined on Nov 2009	#777

Originally Posted by Estel

AFAIK N900's IR diode's (+) voltage is connected with battery - the problem is with element after (-) side of diode (can't remember name now), which got pretty low limit of current passing.

/Estel

with an optocoupler in place of the diode it would not matter, would it? The two circuits would be isolated. You could even go for a Darlington pair optocoupler just for good measure. The new IR diode could run off 3.7 volts directly from the battery instead of being limited to 1.8V or the component limited current on the other side of the opto. It's also just three components (or two if you buy an LED with a built in resistor); an optocoupler, an LED and a resistor. I'm not brave enough to give it a shot (I only have one n900). It is just an idea for anybody wanting a more powerful IR diode built into their N900. The optocoupler/LED/Resistor combo is in a sense a repeater and can be made very small ( easy to fit into mugen type cover).

P.S. would an IR Emitting Diode be called an IED instead of an LED? Not the explosive type obviously.

Last edited by Cue; 10-20-2012 at 05:29 PM.

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sixwheeledbeast	10-20-2012 , 05:34 PM
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Originally Posted by Cue

P.S. would an IR Emitting Diode be called an IED instead of an LED? Not the explosive type obviously.

IR LED, IED is normally used for Intelligent Electronic Device.

There still emitting light no reason to drop the L.

Originally Posted by Estel

sixwheeledbeast, what you understand from that post?

The issue is if the transistors can handle the current.

Last edited by sixwheeledbeast; 10-20-2012 at 05:59 PM.

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Cue	10-20-2012 , 05:48 PM
Posts: 839 \| Thanked: 814 times \| Joined on Nov 2009	#779

Originally Posted by sixwheeledbeast

IR LED, IED is normally used for Intelligent Electronic Device.

There still emitting light no reason to drop the L.

Cool, I guess those in that industry get flagged by intelligence a lot

with that acronym they may even flag themselves.

I always think of "Light" as the visible spectrum of EM radiation but I guess I've heard "IR light" enough to not be bothered by it, a bit like "AC current". Sorry, IED was me being a bit pedantic and I was just wondering if that was the formal term for them.

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	Estel	10-20-2012 , 11:25 PM
	Posts: 3,842 \| Thanked: 5,617 times \| Joined on Mar 2011	#780

Originally Posted by Cue

The new IR diode could run off 3.7 volts directly from the battery instead of being limited to 1.8V or the component limited current on the other side of the opto. It's also just three components (or two if you buy an LED with a built in resistor); an optocoupler, an LED and a resistor. I'm not brave enough to give it a shot (I only have one n900). It is just an idea for anybody wanting a more powerful IR diode built into their N900. The optocoupler/LED/Resistor combo is in a sense a repeater and can be made very small ( easy to fit into mugen type cover).

Hm, theoretically, sounds like very good idea, that could even fit inside N900 body itself, if small components used (no need for mugen cover). No idea, if there wouldn't be lost in transmitted IR "data" (checksums, or whatsnot), that would ruin compliance with receiver's protocol implementations - Copernicus, any ideas here?

As for LED synaptic problem, well, there is ultraviolet light, so why infrared shouldn't be light too, still? Of course, I understand what you mean - generally, "light" is referred only to visible spectrum (or our Wifi antennas, radars, etc, would be also called light-emitting devices - after all, it's only difference of wavelength).

/Estel