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Wiimote Project » Forum » Hardware Support » IR Pens » USB IR pen
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Author Topic: USB IR pen  (Read 2191 times)
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ae804
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« on: January 27, 2008, 12:38:42 PM »
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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ZaPPZion
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« Reply #1 on: January 27, 2008, 06:12:08 PM »
IR-LED's go up to 100mA, so you'd need a 35 ohm resistor;)
(5V-1.5V (IR LED)) / 0.1A = 35 ohm
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bradjudy
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« Reply #2 on: January 27, 2008, 06:15:54 PM »
This is mentioned on Johnny Lee's page and I think he's using USB powered pens in his videos. 
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ae804
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« Reply #3 on: January 28, 2008, 12:42:50 AM »
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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Helza
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« Reply #4 on: January 28, 2008, 06:46:27 AM »
Why would you want to "wire" your wireless IR pen
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ZaPPZion
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« Reply #5 on: January 28, 2008, 07:50:46 AM »
i wired mine as well, so i dont have to do stuff with the battery's Smiley
(and the battery's didnt fit into my pen, next one they will though)
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