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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?

Pages: 1