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Messages - bradjudy

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IR Pens / Re: Prebuilt IR pen light found.
« on: February 17, 2008, 09:58:14 PM »
While looking at items on Amazon for Wiimote projects, I saw this similar one:

It must be popular with Wiimote folks because it was linked from the LED safety glasses, which also link to wiimotes and IR LEDs. 

IR Pens / Re: Quick RadioShack pen
« on: January 28, 2008, 11:02:51 PM »
the radio shack LED has a max forward voltage of 1.6v so are you adding a resistor to your 3 volt power source?

Nope - it will have a shorter life, so this is a temporary solution.  I'm not entirely sure how short the life will be, but long enough to find a better option. 

I also picked up one of these at the store for $5 -

it was the only LED light there that used a single AAA battery, which provides the appropriate voltage for these IR LEDs.  Unfortunately, the button isn't momentary, it's a click-on click-off.  The LED also doesn't appear to be easy to replace, but I'll keep poking at it. 

Thanks!  Your modified version works under PowerPoint 2003 in Windows XP SP2 for me. 

IR Pens / Re: Quick RadioShack pen
« on: January 28, 2008, 08:30:02 PM »
Okay, it looks like the RadioShack LED is more workable than I thought. 

I took one of these LED keychain lights:

and I replaced the two 2016 batteries with a single 2032 battery (this takes the voltage from 6V to 3V) and replaced the LED with a RadioShack one.  This requires no soldering, just a small screwdriver and some small needle nose pliers.  The LED leads have to be cut down and bent to match the removed LED.  The result is a much brighter light (higher voltage and current capability) that works when pointed at the screen (if slightly angled towards the Wiimote). 

After thinking about it, it could be that the hearing aid battery I tried in my pen is also not capable of putting out much current.  I'll try and hook a AAA battery to it and see if the output is higher. 

IR Pens / Re: Quick RadioShack pen
« on: January 28, 2008, 04:17:54 PM »
He references a Vishay LED that is 40mW.  The RadioShack one lists as 8mW on the webpage, much lower than what he was using in his videos when reflecting the light off the surface. 

In a basic comparison using my digital camera as an IR viewer, the RadioShack LED was noticeably dimmer than my TV remote control. 

The Mouser ones are also much cheaper ($0.21 each) than the RadioShack ones ($2 each), but you need to be ordering lots or other parts to make an order to Mouser or Digikey worthwhile. 

IR Pens / Re: Quick RadioShack pen
« on: January 28, 2008, 11:02:17 AM »
Well, the RadioShack LED isn't bright enough to work via reflection, only directly pointed at the Wii remote.  Of course, it's about 1/3 as bright as the one Johnny recommended, which I'll pick up when I do a Mouser order in a couple of days. 

On the plus side, I didn't have any trouble getting the Wii remote to connect to my laptop and getting the whiteboard app to work. 

IR Pens / Re: Quick RadioShack pen
« on: January 27, 2008, 07:27:20 PM »
The LED is on the tip with the button on the rear.  It's not intended to be pushed against a screen since I'll be using it with free-hanging projection screens. 

IR Pens / Re: USB IR pen
« on: January 27, 2008, 05:15:54 PM »
This is mentioned on Johnny Lee's page and I think he's using USB powered pens in his videos. 

IR Pens / Quick RadioShack pen
« on: January 27, 2008, 03:51:21 PM »
I got my Wii Remote in the mail (I don't actually own a Wii) and stopped by RadioShack to see if they had appropriate parts for an LED pen.  While the LED itself is a lower output than the recommended device, I thought I'd give it a try.  I also picked up some 1.4V Zinc-air hearing aid batteries for powering it and their sub-mini momentary SPST switch.  Here's the result:

I'll have to wait until tomorrow to try it all out (I don't have any Bluetooth capable computers at home), so we'll see how well this LED works.  I confirmed with my digital camera that the pen is working, but it isn't especially bright. 

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