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Old 10-25-2010, 08:29 PM #1
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Default Infrared module for Wii remote application

I'm trying to find a 980nm laser module with a dot visible to a Wii remote camera at 10-15 feet. The dot only needs to be about the same size and intensity as a normal 5mw red or green laser.

I have 4 Aixiz 980nm modules, three at 10mw and one at 35mw. With an iPhone camera (has no IR filter) I can see a very small, faint dot at a few inches, but it has nowhere near the same light output as a green laser of the same power rating. The Wii remote picks up the dot, but only at less than 3-4 feet.

Can you suggest a reason why these lasers would not be working as expected? I have been told that they are probably bad, so Aixiz sent me replacements which are exactly the same and I'm running out of ideas. Can you recommend another supplier?


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Old 10-25-2010, 11:22 PM #2
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Default Re: Infrared module for Wii remote application

Aixiz is normall VERY reliable, but if you cannot get that to work, get a 10-30mW from o-like, who sells the cheapest IR lasers at low powers (to my knowledge).
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Old 10-26-2010, 02:41 AM #3
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Default Re: Infrared module for Wii remote application

Perhaps the modules aren't focused for long distance (or can't be).
What size is the dot at a particular distance? Round / square dot or line-like? Post a pic?

Also I understand that sensor gain & min/max IR blob size recognized by the wiimote can be adjusted. Try increasing the max blob size. Might have to search for a GUI that has those settings tho.

Oh yea, and most cheap green lasers can vary a lot from the advertised mW. You green could be 5mW or 50mW, unless you have a LPM or your laser was metered by a reputable seller.
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Old 10-26-2010, 02:42 AM #4
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Default Re: Infrared module for Wii remote application

Perhaps the wavelength is too long.
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Old 10-26-2010, 03:06 AM #5
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Default Re: Infrared module for Wii remote application

I see peak sensitivity reported a couple places as 940nm. It seems to respond to wide enough range that I wouldn't think it drops off sharply before 980nm but you never know.

I hope you let us know how your project goes.
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Old 10-29-2010, 04:46 PM #6
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Default Re: Infrared module for Wii remote application

Thanks for the replies. The dot is circular focused, and small (maybe 2mm at 6 inches), it comes with a lens that can be rotated so I'm sure of that.

At a few inches away, the iPhone camera can see the dot clearly, but it it is small. The center of the dot appears white, so the light's wavelength is getting through to the camera.

I have a 5mw and 35mw green laser, and both are probably over a hundred times more intense than the 35mw infrared. I'm very surprised no one has had this problem before. If it's not supposed to be like this, then you would think it must just be my lasers - but ALL four are bad, with exactly the same problem?

I've been emailing o-lite and other suppliers to order other ones and I'm not getting any response. This project is just a hobby, but it sucks to have to give up on it. I already built the rest of the project - I just need a little laser to stick into it.
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Old 10-30-2010, 03:01 AM #7
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Default Re: Infrared module for Wii remote application

The IR isn't going to appear as bright as green. You'd need a very high power IR laser to be as bright as green. Then it would be too powerful to view without proper eye protection.

I bet the lasers you got are up to spec. The best way to find out would be to use a LPM.

Hopefully you can finish the project. I'd like to see the completed project.
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Old 10-30-2010, 12:28 PM #8
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Default Re: Infrared module for Wii remote application

Quote:
Originally Posted by Dr_Evil View Post
The IR isn't going to appear as bright as green. You'd need a very high power IR laser to be as bright as green. Then it would be too powerful to view without proper eye protection.

I bet the lasers you got are up to spec. The best way to find out would be to use a LPM.

Hopefully you can finish the project. I'd like to see the completed project.
Very very very very.... that would be around 10 watts, mabye even 100 watts...
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Old 10-31-2010, 06:26 PM #9
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Default Re: Infrared module for Wii remote application

Can you tell me why you would need 100 watt laser to be as bright as a 0.01 watt green laser? The power rating refers to the light OUTPUT power, so that doesn't really make sense to me...

I am using an IR-sensitive camera. I'm not trying to magically make IR light visible to the human eye.
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Old 10-31-2010, 08:33 PM #10
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Default Re: Infrared module for Wii remote application

I didnt say 1mW, I said 5-10mW implied from your last post. If you are using an IR sensitive camera, you will need 200-300mW of IR. Its not magic, its power. A very high power IR laser appears with a purple beam to the human eye, so it CAN be visible at higher powers.
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Old 10-31-2010, 10:13 PM #11
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Default Re: Infrared module for Wii remote application

Why I would need over 100mw of power to get the same dot that a normal laser can give at 5mw? What's so special about IR?
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Old 11-01-2010, 01:01 AM #12
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Default Re: Infrared module for Wii remote application

Its less visible to the human eye. Even with an IR sensitive camera it is much less bright than red. Color sensitivity peaks at 544nm and decreases in either direction from that. A 200mW red laser is about as bright as a 5-10mW green laser. Red is at 650nm. Ir is 808nm+. At that wavelegth, you would actually need ~500mWto get the same visibility. With an Ir sensitive camera you could make it work with 200-300mW.
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Old 11-01-2010, 02:45 AM #13
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Default Re: Infrared module for Wii remote application

Hmm. Okay, if that's true, then why would an IR led at roughly identical power as a red or green led give roughly the same brightness? The wii sensor bar uses 850nm and they are very bright, and I've tested with my own Ir LEDs at less than 100mw and they work well.
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Old 11-01-2010, 10:47 PM #14
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Default Re: Infrared module for Wii remote application

Im not sure how much the sensor bar requires. I thought you were making another bar . Then in that case, the bar picks up the power, not the brightness as it is not a human eye. For this use, 5-10mW will work great. Good Luck!
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