Author Topic: Battery / Resistor question  (Read 4361 times)

Offline Jforkey

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on: February 13, 2009, 04:40:12 PM
First off, I have ordered the recommended IR LEDs (TSAL6400 25degrees).  My first though was to build it based on in a sharpie highlighter.  (They are fat and can hold a AAA battery.)  Is 1 AAA battery (1.5v) enough to power the IR LED for a long enough period to matter?  Do i still need a resistor if I use the setup of 1 AAA (1.5v) battery?

The other idea I had was to simply get one of those pens that comes with a LED in it, and just switch the LED with an IR LED.
http://www.youtube.com/watch?v=I568NyZLJkY
Thats a prime example of what I mean.  Again, is that a good setup?  I worry about the IR LED being so far back in the cap of the pen, and the angle not being able to reach the wiimote off to the side.  I haven't tried either, just looking for some suggestions.
Thanks.



Offline benpaddlejones

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Reply #1 on: February 13, 2009, 05:59:26 PM
jforkey
1x AAA is fine. An alkaline battery (1.5v) will over power the IR-Led slightly before the power drops off. Better still use a Lithium (1.4v) as very stable voltage or a NiMh (1.2v) better for the environment.

No resistor is required if you use 2xAAA (will give better IR, but I have found insignificant difference) then yse you will need a 12ohm resistor.

The IR-Pen in the video relies on the mirrored housing this will give poor tracking results, not recomended.

benpaddlejones


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