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Messages - StrongZhu

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IR Pens / Re: [Help]What's wrong with my IR pen?
« on: May 02, 2008, 05:24:59 AM »
The image in attachment shows the region which can be detected by wii remote

white means CAN be detected.
black means CANNOT be detected.

IR Pens / [Help]What's wrong with my IR pen?
« on: May 02, 2008, 05:18:42 AM »
dear all

  I bought a IR LED without knowing it's type. The saler told me that it is very common, and will work under 1.3V, 18mA.
  I connected it with a 1.5V battery and 10ohm resistor.
  The Wii remote did detecte the IR point.

  The problem is that, when I increase the distance between IR LED and the wii remote, (e.g. more than 1-2 meter), The wii remote CANNOT detect anything.....

  Then I shut down all the lamps in the room, and using the USB webcam to detect the IR LED. The image from USB webcam shows a light point even if the distance is more than 3-4 meters.
  Further more, while I put the wii remote near the IR LED(less than 50cm), if i rotate the IR LED with certain angle(e.g. less than 30 degree), the wii remote CANNOT detect anything.... which means I must point the IR pen almost exactly to the IR camear in wii remote. It's inconvenient for using it in a whiteboard. 
  So, what's the detail of IR LED which is working in your IR pen?
  Can it emit IR light to all the direction?
  Thanks a lot.


Project Ideas / Re: Has anyone written a 3D position function?
« on: April 13, 2008, 12:34:22 AM »
Do you mean something like this:

I am curious about how he finished the calibration.

maybe something about affine transformation...

just move the LED to different positions for coordinates of several points.
and solve several multi-variables linear equations.

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