Wiimote Project » Hardware Support » IR Pens » Powered IR Pen
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: Powered IR Pen  ( 4326 )
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« : January 30, 2008, 11:29:55 PM »

So, has anyone thought of this.....

To prevent batteries going flat, don't use batteries. ;D
Power the IR Pen(s) from a USB port, what's that you say? USB is 5VDC, and your IR LEDs want 3VDC? 
Ok, how about a 3V regulator like a BA30BC0T...
It will happily drop your 5V down to 3V and sink up to 1A so it could drive 4 IR LEDs. Or, being in a T0-220 you could fit one in each pen. 

My long term plan was to drive the Wiimote and 4 IR pens from the same regulator, I'm just trying to think of a clean way to mount the Wiimore and run all the wiring and make it look good too.
Guru
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« #1 : January 31, 2008, 03:51:19 AM »

people did this already, but the great thing about using batteries, is that you can use the pen wireless:P
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« #2 : January 31, 2008, 06:17:01 AM »

3V is too much for IR-LEDs. They are running at 1.2V -1.5V
Guru
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« #3 : January 31, 2008, 06:59:25 AM »

that's why someone created resistors
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« #4 : January 31, 2008, 10:47:57 AM »

3V is too much for IR-LEDs. They are running at 1.2V -1.5V


Ok, fine then use a BA15BC0T... that will take it down to 1.5VDC
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« #5 : January 31, 2008, 10:52:51 AM »

that's why someone created resistors

When either will perform the desired funtion, I'd prefer to use regulators to resistors.  But that's just me. YMMV
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