Author Topic: my IR pen doesn't seem work??  (Read 5176 times)

Offline haruya

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on: August 25, 2008, 11:50:48 AM

Hi ,everyone

I've seen Johnny's VDO and I'm interested,so I bought a bluetooth adapter to connect the wiimote with my PC (that still didn't work too!! I'll ash in the /wiimote-and-bluetooth-connectivity/ board)

Then, I had another way with my macbook so that's fine to connect the wiimote with macbook by DarwiinRemote0.3 and Wiimotewhtieboard( but not have a board for writing??)

After that I've try to made my IR pen but around here(Thailand) I can't fine TSAL6400 here(have to order and wait for a week) but I get HSDL-4230 (I think the specification is OK) and The Resister 100 Ohm 1/8 W.then I follow this link

http://www.wiimoteproject.com/ir-pens/diy-how-to-make-tip-pressure-ir-pen/

but I group The 8 resisters together (parallel) =  12.5 Ohm

so i've done it.tested with my web cam that work!!(I saw the light form LED when I push the switch)

but with the Wiimotewhtieboard app seem like didn't see my pen correctly( My idea is my IR light too low ) when I point the pen to the monitor,but if I hold the pen backward (point the LED to wiimote ) It's seem better (but I think that's not a good idea)

...where i'm missing ...

please help

sorry in my English skill

thanks for all


haruya



Offline benpaddlejones

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Reply #1 on: August 25, 2008, 06:50:39 PM
haruya
Read: http://www.wiimoteproject.com/ir-pens/electronics-101-sharing-my-mistakes!-***-updated-***/

Get the data sheet for you IR-Led and my above post you will be able to work out if your IR-Led cuts the mustard.

Will also be able to check if you are using teh correct resistor for your power source and IR-Led.

If you are using a non-reflective surface will also cause similar problems.

Gooduck :)

Benpaddlejones


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Offline haruya

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Reply #2 on: August 26, 2008, 07:05:43 AM


Thank you very much for your adviced benpaddlejones.

Today I've try to made a new pen by your link
Quote
http://www.wiimoteproject.com/ir-pens/electronics-101-sharing-my-mistakes!-***-updated-***/

thas's my HSDL-4230 -->Forward Voltage = 1.5 V
                       Forward Current = 100 mA
         and my AAA(1.5 V)x2 batteries = 3 V

so I have to use the 15 Ohm resistor

after I made it ,it's more brite than yesterday (by my web cam) but it's still didn't take effect to much with my mc book(but better than)
and also not work with non reflecttive 22" LCD and projector on the wall(4000 lumens)

do I miss something again??...

many thanks,

haruya

PS.I've order for TSAL6400 and it'll comes next week(Thu) ... any thing I can do by now ?? or keep waiting ?



Offline benpaddlejones

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Reply #3 on: August 26, 2008, 07:36:23 AM
haruya
Your datasheet:
http://www.datasheetcatalog.org/datasheet/hp/HSDL-4230.pdf
Your problems:
1. Wave length = 875nm
Whilst, yes 875nm is in the IR spectrum the filter on the front of the wiimote (without it the sensor would detect all light spectrums) is set for 940nm so much of your light is filtered.

2. Viewing Angle = 30o
Too narrow VA, makes it difficult for the IR-sensor detect when limited reflection

3. Tight Relative Radiancy
Means a very bright but small IR-Blog great for close detection (ignoring wrong frequency) but may be too small for distant detecting.

Summary
haruya, now knowing your exact IR-led I can safely say, nothing you can do! Will have to wait until the delux TSAL6400 arrive.

Sorry  :-[

I suggest you use 1x AAA 1.2v rechargeable NIMH battery, as better for the environment and no need for a resitor and thus less soldering.

Benpaddlejones :)



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