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Messages - ae804

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IR Pens / Re: USB IR pen
« on: January 27, 2008, 11:42:50 PM »
Ah--well, I didn't know what the current was... and I hadn't seen any mention of USB pens, so I figured I'd throw the idea out.  The batteries I've seen on a lot of the pens on here seem to be a large eye sore (at least to me)

Well, sounds like it's not new news

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IR Pens / USB IR pen
« on: January 27, 2008, 11:38:42 AM »
Just an idea--USB provides a +5 and GND(+0) line through the specifications.  Couldn't we make an IR pen using those power lines to turn the pen on.  It'd be a lot more compact than a AA battery(or two AA batteries).

Just a thought.  The circuit would be very easy.

+5->(about)220 ohm resistor->IR LED->GND

Any thoughts?

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