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Author Topic: Open camera questions:  (Read 6946 times)
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« on: February 15, 2008, 12:46:18 AM »

1. Separating the camera:
I was wondering if anyone had done work separating the caemra from the Wii Remote.  Two of the pins seem to be an I2C bus.  There's at least one other that seems to have signal on it, but it looks analog.  The dearth of external components around the camera suggests that it's a fairly stand-alone module though.  So ... anyone else done work in this direction?

2. Peak sensitivity wavelenth:
Anyone know what the peak sensitivity of the camera is?  I did some testing with the sensor bar and a small bank of filters, and it seemed like the LEDs in there were probably 950nm.

3. Shutter length of the camera:
Some other testing I've done suggests that the exposure length is significantly less than 10ms - more like 1ms.  Has anyone explored this, and whether any of the configuration registers affect it?

4. Photometric calibration:
My current research requires a pretty accurate photometric calibration of the camera.  Before I reinvent the wheel I was wondering if anyone else had worked on this.
« Last Edit: February 15, 2008, 12:49:43 AM by inio » Logged
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« Reply #1 on: April 28, 2008, 06:12:36 PM »

I just have a question on your first point.
If you successfuly separate the camera, would the module that identify the IR points is inside the camera or on the circuit board of the wiimote?
So you would likely have to code a software to identify each IR points?

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« Reply #2 on: April 28, 2008, 06:50:50 PM »

The point tracking is done in the camera module itself.  You can observe the same bits seen in the input reports going over the I2C bus.
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« Reply #3 on: April 28, 2008, 06:55:41 PM »

Forgot about this topic, should make some updates:

1. Separating the camera:
Further research indicates that the external components required are a 24MHz clock, pull-up resistors on enable lines, and maybe some power bypassing.  There's another thread on this board that talks about the I2C protocol.

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2. Peak sensitivity wavelenth:
850 is looking more likely.

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3. Shutter length of the camera:
about 500us.

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4. Photometric calibration:
Haven't solved for intrinsic parameters yet, but it's at least very low distortion.  It's less than 1 sensor unit, well below non-linearities and error in the subpixel analysis and on the order of quantization error.
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« Reply #4 on: March 01, 2010, 11:37:27 AM »

I've gotten the Wiimote Camera to work without desoldering it from the wiimote board, better yet without disturbing the wiimote at all (except for 1 very tiny hole);

I always try to do my hack jobs, with the least bit of physical 'hacking/destruction.'

I drilled a tiny hole near the IR cam and soldered a small wire to hook up the IR cam externally to a 24MHz clock. Then I used the WiiMote's I2C port as the I2C bus. Used an arduino (via Nunchuck Cable) to read/relay the camera data. I'll have pictures and a post up soon.
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« Reply #5 on: March 01, 2010, 07:18:42 PM »

I've gotten the Wiimote Camera to work without desoldering it from the wiimote board, better yet without disturbing the wiimote at all (except for 1 very tiny hole);

I always try to do my hack jobs, with the least bit of physical 'hacking/destruction.'

I drilled a tiny hole near the IR cam and soldered a small wire to hook up the IR cam externally to a 24MHz clock. Then I used the WiiMote's I2C port as the I2C bus. Used an arduino (via Nunchuck Cable) to read/relay the camera data. I'll have pictures and a post up soon.

Sounds very interesting! can't wait to see the pictures.

Dice
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« Reply #6 on: March 17, 2010, 09:09:55 AM »

search for this post: Wiimote light follower with servo
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« Reply #7 on: March 29, 2010, 02:39:24 AM »

Johnny Lee had an article (on his blog) on connecting the wiimote pixart camera directly.
Here is the link:
http://procrastineering.blogspot.com/2008/09/working-with-pixart-camera-directly.html

It is very informative
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« Reply #8 on: August 11, 2011, 07:18:51 PM »

Hi there! How as your project? I would like to hear some news about it. I am interested in your idea.
Thanks man. Smiley
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