As I've been in the aerospace biz, and know that G-force sensors are relatively cheap nowadays (used for Automobile Airbags, for one thing, so they're a mass market item not a custom sensor anymore, thus a lot cheaper) so a thought comes to mind; Partially from Steve Mann's & other folks' posts. (I haven't lived with a HUD yet, but this is an intriguing thought to me...) <Warning, TechSpeak follows> The thought of having my Linux system watch a 3-axis accelerometer and shift to lower heads-up display resolution automagically when I am in motion, then shift back up to higher resolution when I am at relative rest for over 30 seconds, has come to me. (Place the sensors in the belt or on the vest, not on my heads-up display, BTW, so this can work right!) This way, if I am walking, the display resolution can go down to 60 or 40 characters & to "essential information only" mode; If I sit down to do some text editing (coding, look at my schedule, whatever) I have high resolution. A simple asymmetrical digital low-pass filter could be used to change the X, Y, Z inputs (read peak values, 4 times a second or so?) then square & sum them into a gate value to determine whether I am "moving" enough or not (I'd want 3-4 seconds of movement before a shift down, and 30 seconds or so of stopping before a shift up in resolution when I stopped; I imagine the resolution shifts could be distracting if they happened more often! But maybe do a quicker shift up in resolution, if I'd only moved for less than 15 seconds, so if I answer the telephone here I can get it & be in high-res mode.) <TechSpeak ends> Practical? Stupid idea? Any constructive feedback appreciated <G> Would a simple toggle switch be just plain more user-friendly? Mark Willis
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