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The Wii's MEMS Inventor on Future Technology
eldavojohn writes "IEEE Spectrum is running an article on the inventor of the motion sensor that the Wii uses. The microelectromechanical system (MEMS) gives Wii its core ability to sense motion in the controller. What's really interesting is where Benedetto Vigna wants to take this technology. He has plans to make the sensor smaller and tougher, and hope to place it inside of things like shoes, textiles, and medical devices to aid in data collection. He continues, 'Then I want to make a three-dimensional gyroscope, to measure rotation around three different axes. Today, such products are quite big, a cube 10 centimeters on a side. We want to do this in less than a 30-millimeter cube, to serve as an image stabilizer in cameras and to track a person's position in the intervals when he can't get a GPS signal.'"
Having used the Wiimote for a couple months now I am definitely not looking forward to any other devices using similar technology. The Wiimote is very laggy and fin control is sorely lacking with the device. For simple party games it is no big deal because you are usually rapidly flailing your arms around, but for real games the inconsistencies of the Wiimote are frustrating.
Application of this could be interesting especially in places when a little bit of lag does not hurt anything. I have a hobby of photography and a good digital image stabilizer is would be the best thing since sliced bread.
"All you need is ignorance and confidence; then success is sure." -- Mark Twain
It is integrating your velocity to estimate where you are between GPS solutions. Navigation and guidance systems for high velocity (read military) devices do this already out of necessity. However, it would also be useful for low velocity situations where you have a spotty GPS signal. In that situation it doesn't have to be perfect to be usefull, especially if the display indicated the approximate error in the estimation by drawing a circle for your position rather than a dot.
I'm going to start by saying I know very little about robotics ...
I could see how something like this could be useful because (much like the inner ear for humans) a device like this could be used to aid in the balance of robots. I could be wrong but it seems like most robots are currently designed to "walk perfectly" a feat which escapes most people; how often have you stubbed your toe or tripped on a stair? If a robot knew that its "body" was no longer in balance it might be able to correct for the "mistake" before it falls and (in essence) no longer be required to "walk perfectly" in order to walk effectively.
Someone should tell him about the solid-state gyros already in use in aircraft instruments. Six years ago at Oshkosh I played with an all-electronic artificial horizon instrument. IIRC, it uses those funky crystals which exhibit piezo-type effects when rotated in space. The entire unit, including LCD, CPU, power supply, backup battery, and of course the three solid-state gyros, was a cylinder about 3"x3"x12".
Even in its infancy, the device was massively, hilariously more reliable than the steam-powered mechanical gyros that are currently standard fare for General Aviation.
And that was six years ago.
All this time, I've been thinking (quite wrongly) that the Wii's controller used these same devices.
FATMOUSE + YOU = FATMOUSE
Application of this could be interesting especially in places when a little bit of lag does not hurt anything. I have a hobby of photography and a good digital image stabilizer is would be the best thing since sliced bread.
Please stop spreading the myth that "digital image stabilization" is a valid technology. It's nothing but snake oil by digital camera companies desperate to compete in a flooded market, and an attempt to trick consumers who don't know better (and screw with the results presented by "product selectors".)
REAL image stabilization uses a servoed prism inside the lens; the image is optically stabilized by sensing movement and adjusting the prism to correct. Current systems from Canon can compensate between 2 and 3 stops; dunno about Nikon's, but it is probably about the same. The systems work gloriously well, though they only compensate for movement of the LENS, not movement of the subject. A slow exposure will still be a slow exposure; if the subject is waving, their hand is going to be blurry. There's no substitute for light, sensor sensitivity (and low noise at high sensitivity), and maximum aperture (how "fast" the lens is. Smaller f-stop numbers are wider, and hence faster.)
FAKE "image stabilization", which Olympus (among others) are pushing- it only cranks up the sensitivity of the sensor to shorten exposure time. This only results in shorter exposures- and a LOT more noise, especially since most consumer cameras have tiny little sensors (the smaller each sensor pixel, the less light it collects, and the more it needs to be electrically amplified.) You can do this on *any* digital camera with adjustable ISO!
Please help metamoderate.
http://www.pinktentacle.com/2006/12/asimo-help-me- ive-fallen-and-i-cant-get-up/
Nerd rage is the funniest rage.
What utter bullshit!P ath=23_85P ath=23_83
Having personally developed and packed a six axis MEMS inertial sensor (x,y,z acceleration, roll, pitch, yaw rate of rotation)into a 25x25x13mm cube (With my bare hands!!)potted in epoxy, with a rubber lining and a kevlar reinforced cord, and run 2 of these units for several hours at kilohertz rates logging onto a SD card, I can attest that 30mm cube MEMS sensors already do exist and have existed for over 5 years. Hell you can buy them in quantities of one from sparkfun:
http://www.sparkfun.com/commerce/categories.php?c
(while the sparkfun units are 51x51x23mm thats because they're avoiding many layer multilayer boards and low pin count microprocessors)
Note that 3 axis compasses are readily available as well:
http://www.sparkfun.com/commerce/categories.php?c
Now the devil in the details. MEMS accelerometers are noisy, and so are the MEMS rate gyros. They're about as good as your inner ear which operates on somewhat similar principles. As a result they track reasonably well for short periods of time but exhibit considerable drift over longer periods of time, just like you can guess your path over a short distance but end up going in circles in total darkness. A compass helps, but they get scrambled by magnetic fields from electric currents or pieces of ferromagnetic material. Inertial sensors (other than missile grade units which are orders of magnitude more sensitive and complex) only complement GPS and other absolute measurement systems. That's why the Wii has the optical sensor integrated in it as well.