Author Topic: Nunux IR pen  (Read 16708 times)

Offline nunux75

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on: January 13, 2008, 10:22:51 AM
Hi,

To do my pen:
 
I've buy the article "77-2464 B01" from:

http://www.cyclades-elec.fr/catalogue.asp?num=310

Then I remove the laser beam diode an remplace it by an IR led + a 33ohm resistor.

Picture are here:
http://nunux.free.fr/irpen/

Video test here:
http://www.youtube.com/swf/l.swf?video_id=ieVDp1We32E

Cheers,

Pierre



Offline dice

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Reply #1 on: January 14, 2008, 12:23:28 AM
so this is no longer a laser correct?  Just IR LED pen.

seems to be very clear, might be worth looking into more, I am currently working on a touch on / off, no buttons device

This is the start of my project
http://www.wiimoteproject.com/general-hardware-talk/dice-tries-to-make-a-new-ir-device-t126.0.html


Dice :)



Offline nunux75

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Reply #2 on: January 14, 2008, 04:13:13 AM
so this is no longer a laser correct?  Just IR LED pen.

Yes, and without adhesive tape ;-)

The result is professional looking, but maybe a little expensive ...

... and require solding iron skill.

I may provide some modified pens, if people are interested ...

seems to be very clear, might be worth looking into more, I am currently working on a touch on / off, no buttons device

This is the start of my project
http://www.wiimoteproject.com/general-hardware-talk/dice-tries-to-make-a-new-ir-device-t126.0.html

I've look at the result. But why don't you add a resistor to stay in 3v ?
(You will have a better autonomie, and avoid a complex mecanical bypass
involving electric tape that may make the battery change harder...)

Cheers,

Nunux.



Offline dice

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Reply #3 on: January 14, 2008, 06:40:53 AM
so this is no longer a laser correct?  Just IR LED pen.

Yes, and without adhesive tape ;-)

The result is professional looking, but maybe a little expensive ...

... and require solding iron skill.

I may provide some modified pens, if people are interested ...

seems to be very clear, might be worth looking into more, I am currently working on a touch on / off, no buttons device

This is the start of my project
http://www.wiimoteproject.com/general-hardware-talk/dice-tries-to-make-a-new-ir-device-t126.0.html

I've look at the result. But why don't you add a resistor to stay in 3v ?
(You will have a better autonomie, and avoid a complex mecanical bypass
involving electric tape that may make the battery change harder...)

Cheers,

Nunux.

I was up last night and I think i will just go put a resistor.  Thanks for the suggestion.  I was also thinking will the distance from the screen make a big effect?

there is like a 30 degree angle in the front, do you think that will make a difference?

I guess ill just have to test it, if it does not work Ill just start over.

Thanks for the comments

Dice



Offline romlel

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Reply #4 on: January 14, 2008, 05:21:19 PM
Bonjour,

I tried to achieve the same level of "compactness"... cheaper... but WITH adhesive tape ;-)



These are standard pens. For each one, I emptied it, threw away the inside except the small spring (used normally to "clic" it open) witch I cut into 2 halves.

In the frond, a IR LED (1.35V, 100 mA) and a 4.7 ohms resistor. The plastic of the pen has been cut off to insert a compact switch under the user's thumb.

In keep the LED/resistor and the battery apart with a "stuff" of absorbent paper in the centrer... Only two wires go through.

The two halves of the small spring are used at each end of the battery to make contact (soldered with the wires).

As the pen couldn't be screwed closed, I had to use robust adhesive tape to keep the battery in place.

Bye,
Romain



Offline nunux75

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Reply #5 on: January 14, 2008, 06:42:44 PM
I was also thinking will the distance from the screen make a big effect?

I always put the head of the pen in contact with the screen to draw easier.
The led is at 5 millimeters of head of the pen.

there is like a 30 degree angle in the front, do you think that will make a difference?

It's may be better, because the IR beam will be less open than in other case,
so it can be more accurate. In my video demo, I was running in 1280x800 res,
and the wiimote position was not at he best place (using only 2/3 of the input window)

Cheers,

Pierre



Offline nunux75

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Reply #6 on: January 14, 2008, 06:45:29 PM
Bonjour,

I tried to achieve the same level of "compactness"... cheaper... but WITH adhesive tape ;-)

Hi Romlel,

Nice try! can you precise which type of battery do you use ?
Have you made a video ? How the pen react ?

Cheers,

Pierre




Offline romlel

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Reply #7 on: January 15, 2008, 02:30:52 AM
Hi,

it's a LR61AAAA (1.5V, 550 mA) : http://www.e86.fr/fr/produit/022516/lr61aaaa_.html.
I had mine for 2 : As it is a "noname" product.

The pen reaction is smooth. I can't post a video, but a drawing made with the pen if you want :)

Like you, I have to keep the LED in contact with the screen to avoid "double-tracking". If not, the reflection of the light by the screen AND the LED itself are both tracked, which I don't want. I use black adhesive tape to avoid "side lighting", and perhaps entirely wrap the LED with tape to make it more like a "light gun" if needed;

CU



Offline nunux75

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Reply #8 on: January 16, 2008, 07:29:21 AM
The pen reaction is smooth. I can't post a video, but a drawing made with the pen if you want :)

We should open a Gallery to show painting in a special section ! Dice, can we ?



Offline Linkid

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Reply #9 on: January 16, 2008, 10:47:10 AM
Hi !
I love your pens !!! So, I would like to make one, but I don't find a french website with switch...
Therefore, I would like to know where you buy your switch and the which one...
Thanks !



Offline Ingmar

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Reply #10 on: January 16, 2008, 12:53:17 PM
I'm not getting something about the led.. Does it have to shine IR light forward, and not all the way around? I thought that the light had to shine like the grey lines on the image below and not like the red lines!

http://img186.imageshack.us/img186/8144/ledow5.jpg



Offline romlel

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Reply #11 on: January 16, 2008, 02:36:22 PM
Hello,

For switches in France...

I suggest this one : http://www.conrad.fr/bouton_poussoir_miniature_p_18925_19008_116516, but you can go to any electronics shop and ask for it (in the components section, with resistors, transistors and so on...

Bye



Offline romlel

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Reply #12 on: January 16, 2008, 02:45:14 PM
Hello,

About the direction of the light, the two are possible...

- As the LED has a kind of lens in the front, light is mostly directed forward (red lines), reflected by the LCD screen, and sent back to the wiimote. Think "laser beam", even if there is more dispersion of the light.
- The LED can also been viewed "directly" by the camera... Gray lines...

So, even you want the "gray lines" or the "red lines", but not both because otherwise you'll have 2 points tracked...

For Whiteboard, I suggest the "red lines" method, by adding black tape around the LED (on the sides) ton avoid too much dispersion.

Alternatively, I plan to add "fuzzy transparent tape" on the LED to help "gray lines" dispersion, and reducing the amount of light emitted on the front... Time will tell...

a+



Offline ZaPPZion

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Reply #13 on: January 16, 2008, 02:52:15 PM
What I've been wondering: is the amount of IR light enough to reflect on any surface? or just specific materials like an LCD or even a mirror?
I first thought the LED would be at the back of the pen, but then i realised that wouldn't be accurate enough (due to the angle you're holding the pen). I'm going to buy some LED's, resistors and push-buttons tomorrow, so i'll be experimenting with it as well:)
People are actually showing some pretty good work on their pens already:)



Offline Ingmar

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Reply #14 on: January 16, 2008, 03:27:55 PM
So the led doesn't even have to be visible (see first post in this thread)? Because the line that the pen of nunux75 is drawing, is less smooth then the pens from Johnny Lee...