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Topics - inio

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General Discussion / Sensitivity Settings - Finally Understood!
« on: May 11, 2008, 01:32:14 PM »
Finally sat down with what I knew and a signal generator.  I've got the sensitivity settings significantly more documented:

See the "Sensor Gain" section for the juicy bits.

Big news:  We now sense SIGNIFICANTLY DIMMER POINTS THAN BEFORE.  This opens the door for lots more battery powered applications, longer-distance sensing, and possibly even retroreflective pupil tracking.

General Discussion / Fork Wii Remote info from Wiibrew & Wiili
« on: February 26, 2008, 01:58:40 PM »
Nintendo has so far demonstrated accepting ambivalence towards alternate uses of the Wii Remote, but tactful dissent towards modding and homebrew on the Wii.  In the last few days, the modding/homebrew scene has been getting a lot of attention due to the successful booting of homebrew via the twilight hack.  A softmod is the next logical step, resulting in increased attention and Nintendo's tactful dissent turning into C&Ds and/or DMCA takedowns.

This is a concern for us because one of the main modding/homebrew sites, Wiibrew, is also the best site for Wii Remote information.  Wiili is in a similar situation.  In the interest of distancing ourselves from the modding/homebrew scene, and providing a more stable home for Wii Remote information, I feel it would be advantageous to start a Wiki focused on the Wii Remote and fork the information from Wiibrew and Wiili onto it.

What do people think?

Say Hi! / Hey-O from Santa Cruz
« on: February 14, 2008, 04:00:16 PM »
Went to Johnny's talk up at stanford yesterday.  My Masters work (at UCSC) is using the Wii Remote as a sort of motion-capture camera for 6DOF input.

General Hardware Talk / Open camera questions:
« on: February 14, 2008, 03:46:18 PM »
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.

Project Ideas / Point IDs
« on: February 14, 2008, 03:36:14 PM »
This came up at Johnny's talk yesterday:

identifying tracked points would be really useful.  Encoding id's through time-domain modulation is the obvious way to do this.  That is, have each point somehow send out a unique string of 1s and 0s that identify it.  The questions then become:
1. What code to use to minimize bits-to-ID (code theory question, there's probably an EASY answer somewhere)
2. What bit rate to send the code at to minimize time-to-ID (trivial engineering question)
3. Is is possible to continuously track the modulated point (tricky question)

Obviously the answer to 3 is no if you're turning it off entirely.  However, using the "full" output mod (doc'd on wiibrew now - sorry, thought I wrote it up long ago) you can get 8 bits of intensity data. This should be enough to allow dimming the point a bit (likely via PWM at a fairly high frequency) to differentiate 1s and 0s.

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