Author Topic: Finger tracking not working with 8 IR Leds  (Read 10175 times)

aybe

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on: January 11, 2008, 10:22:40 AM
Hi,

I have built an IR emetter surrounding the Wiimote.
like that : http://www.conrad.fr/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10001&storeId=10001&productId=216824&langId=-2&ItemHighLightId=50672&from_fh=1&category=recherche

When i use an IR Led on my hand, it is detected but
when using reflective tape it's seen only when you are
one inch away from the Wiimote.


How many IR Leds are needed for good operation with fingers ?

Would something like this IR projector, would work ?
http://www.pearl.fr/article-KT247.html

Thanks a lot for your help !



Offline gabort

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Reply #1 on: January 12, 2008, 09:12:46 AM
Hi,

I think the emitter you linked from Conrad is just not powerful enough. It lists current consumption to be between 40 and 120 miliamps - and that's with 12 leds. Comes out to be about 10mA per led, which is very low. I found some single leds that are 100mA each. Buy some of those, unsolder the old leds and switch them with some of these for example: http://www.positron-libre.com/archives/composant-electronique/led-infrarouge-ld271.pdf and you will have a much stronger chance of succeeding.



aybe

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Reply #2 on: January 12, 2008, 01:39:27 PM
Hi Gabort,

Okay, i'll try that and tell you how it goes ...

Do you think if 8 IR Leds will be sufficient ?


Thank you  :D



Offline gabort

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Reply #3 on: January 12, 2008, 06:48:45 PM
I can only hope, I have not tried this project on my own.
I think it could work, but before you do all the work, you could try the sensor bar as a source. It has 5 strong leds on both sides of it.



Offline bryanarby

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Reply #4 on: January 14, 2008, 12:39:08 PM
Youtube has movies of ppl using 12 LEDs from close range (40 cm orso)
I wouldn't be able to see how they work at range...
If your bored go for overkill like Lee (lol) if it still doesn't work with that amount I would look at the reflective tape your using :)
interested in how this ends, not helping myself (besides brainstorming), WB project goes infront (it could revolutionize the way of giving presentations @ school :3
more for fun then for really using: I saw a 100W IR lamp lol! if THAT doesn't work go seek a new wiimote...

Greetz,
Bryanarby
« Last Edit: January 14, 2008, 12:48:47 PM by bryanarby »

wiipen
point ATM: building V2
V1: 1 LED on 1 AAA battery feed
V2: 1 LED on USB feed
V2 will be remodded too V3
V3: 1 LED on USB feed /w LMB and RMB
V4: 1 LED WIRELESS /w LMB and RMB
V5: we'll see :3
Vmany: Bluetooth IR pen with mouse functions.


Offline troy59

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Reply #5 on: January 14, 2008, 12:41:46 PM
try using 20 high powered IR leds, and if that doesn't work, then use more, you can never have enouch IR leds.



aybe

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Reply #6 on: January 14, 2008, 04:48:04 PM
Hi,

I already know that I should use higher power Leds,
i found some on remote controls, their package seems to be a little blue compared to others that are crystal clear.

I thought about the IR lamp but it's not designed for long usage,
for your eyes and skin...

I have a 1.5A power supply so plenty of spare power in case i need to upgrade.


Thought about another thing but don't know if it exists : CMS IR Leds,

I'd be then able to have a very small thing to put on my finger.

I'll try with 12 leds high power, i think it'll do the job;
the previous ones were not very shiny at all.

thanks



Offline troy59

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Reply #7 on: January 16, 2008, 11:16:01 AM
just remeber, bigger is better



Offline bryanarby

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Reply #8 on: January 16, 2008, 12:22:27 PM
bigger, better, burger king... oh without the burger king i'm just hungry (going down to eat xD)

wiipen
point ATM: building V2
V1: 1 LED on 1 AAA battery feed
V2: 1 LED on USB feed
V2 will be remodded too V3
V3: 1 LED on USB feed /w LMB and RMB
V4: 1 LED WIRELESS /w LMB and RMB
V5: we'll see :3
Vmany: Bluetooth IR pen with mouse functions.


Offline troy59

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Reply #9 on: January 16, 2008, 12:27:20 PM
i hate the bk lounge, its so disgusting and/or filthy. Also mcdonalds is a waist of our tax dolars. :) the only fast food i like is taco bell, in n out, and arbies.



Offline Burkazoid

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Reply #10 on: January 18, 2008, 04:37:41 AM
Does anyone know what mA/mW the LED's that Johnny used were?  Also, is there any danger to human eyesight using these?

Thanks in advance
« Last Edit: January 18, 2008, 04:46:18 AM by Burkazoid »



Offline netsultan

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Reply #11 on: January 22, 2008, 01:46:47 PM
If you see Lee's videos, he use IR array with finger tracking, but for the other videos he don't use arrays of LEDS, he only uses IR projectors, right?



Offline troy59

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Reply #12 on: January 23, 2008, 10:50:34 AM
@ Burkazoid

The won't cause harm to your eyes, and i think he was using at least 100ma leds, could be great, i don't know

@ netsultan

ummmm... no... he doesn't use ir projectors. He uses a single led on a stick for the whiteboard, and he uses two leds on glasses for the Desktop VR