DocScrutinizer05 changed the topic of #qi-hardware to: Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben / atusb 802.15.4 wireless, and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs and http://irclog.whitequark.org/qi-hardware
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<wpwrak> zrafa: btw, did you get somewhere with the simulator now ?
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<wpwrak> hmm, nouveau driver acting up, it seems. or maybe it's the hardware that went klingon
<wpwrak> let's see if i can close the xchat connect dialog ...
<wpwrak> phew. this time it worked
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<wpwrak> well, for a few seconds at least
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<wpwrak> hmm, strange error patterns
<wpwrak> e.g., start mocp in xterm on the nividia -> system freezes
<wpwrak> weirder: switched primary to ati, and that one had a hang, too
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<eintopf> mocp :o
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<whitequark> wpwrak: testing the limits of my camera. https://i.imgur.com/kF6JRVq.png
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<wpwrak> whitequark: is this a new one ? or the SLR you bought already a good while (> 1 year ?) ago
<whitequark> wpwrak: actually that's even a bad pic, let me upload a new one in a moment
<whitequark> same camera though
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<wpwrak> nice :) now, on to reverse-synthesizing the netlist :)
<whitequark> well, resolution's not high enough
<whitequark> I'm going to get an optical microscope.
<wpwrak> DocScrutinizer05: i guess that's the sort of camera you should have :)
<DocScrutinizer05> yes, I know
<eintopf> whats the correct word for a potentiometer which doesn't block
<eintopf> newbie question :-)
<eintopf> I mean I want to measure the angle of a 360 degree stick mounted at the end at the potentiometer - like this http://walter.bislins.ch/physik/media/Pendel.png
<wpwrak> "rotary encoder" ? ;-)
<wpwrak> (but such an encoder has has discrete positions)
<DocScrutinizer05> such thing doesn't exist
<DocScrutinizer05> yes, you can get encoders, but they rarely ever use the potentiometer approach
<eintopf> ah okay, so no potentiometer
<DocScrutinizer05> rather two 90° phase skewed adjustable capacitors, or recently rather digital encoders
<eintopf> but I need more granularity than 8 bit
<DocScrutinizer05> when you need more resolution than 8 bit, then how about using a laser mouse looking on a ring mounted to the axis, and have an index marker of some sort (e.g. a hole in ring and a light path sensor) to keep track of the absolute position
<eintopf> this sounds too complicated for me
<whitequark> that's actually a very high-resolution method
<whitequark> you have mice upwards to 8000dpip
<whitequark> *dpi
<DocScrutinizer05> of course you also can do a binary encoder, but that's for sure even more complicated. BTW usual potentiometers have a resolution quite a bit less than the requested 9 bits
<whitequark> and you can make radius as high as you can possibly want
<DocScrutinizer05> whitequark: exactly
<whitequark> i.e. it essentially offers unlimited resolution
<DocScrutinizer05> and shouldn't be any complicated to build either
<whitequark> though at some point accumulating error will be a big problem
<DocScrutinizer05> optical mice afaik have no systemic accumulating error
<eintopf> what the hell is a light path sensor
<whitequark> DocScrutinizer05: of course they do
<DocScrutinizer05> a thing made of an LED and a light sensor, both form a gap
<whitequark> it traverses 1mm, it says it traverses 1.1mm
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<DocScrutinizer05> that's not systemic accumulating error, that's maybe a calibration factor
<whitequark> mmm
<DocScrutinizer05> afaik the sensor works with pattern recognition and that has no _error_
<whitequark> well, there are two concerns
<DocScrutinizer05> when you move the target a million times back and forth for 10mm, it should still shop position:0.0000000
<DocScrutinizer05> show*
<whitequark> that'd be a different kind of error
<DocScrutinizer05> everything else is not error but calibration
<DocScrutinizer05> or error introduces by noise/jitter, but that's still not accumulating in this concept afaik
<DocScrutinizer05> iow once you calibrated the ting to show 10000cm as 10000cm, it's as accurate as it gets: 1/8000 inch
<whitequark> yeah, that makes sense
<DocScrutinizer05> the rest are non-linearities but no accumulating errors
<eintopf> you mean with index marker some point like 0 degree's and the mouse detects all movements?
<DocScrutinizer05> yes
<eintopf> this really working on long distance?
<eintopf> s/this/do this/
<qi-bot> eintopf meant: "do this really working on long distance?"
<DocScrutinizer05> such concept obviously needs a setup procedure after power up
<DocScrutinizer05> where's a long distance in this design?
<DocScrutinizer05> the mouse sensor should hove a 0.5mm over your ring
<DocScrutinizer05> hover
<eintopf> ah, yes
<DocScrutinizer05> or even glide on it
<eintopf> I understand
<DocScrutinizer05> after poer up you need one full turn of axis to make sure the index marker passed by
<eintopf> s/I understand/I see
<qi-bot> eintopf meant: "I see"
<DocScrutinizer05> a second turn can auto-calibrate the mouse data, you know it's been 360.000° when index marker passing by a second time
<DocScrutinizer05> when your mouse reported 36000 clicks until that 2nd index event, you know it has a resolution of 1/10 degree
<DocScrutinizer05> err 1/100
<DocScrutinizer05> such sensor would be *very* fine grained and accurate
<DocScrutinizer05> and you can build it for 25 bucks from material you got in your garage ;-)
<whitequark> 25 bucks? how about zero
<eintopf> okay, okay. This sounds like a nice solution. Thanks
<eintopf> now I need to figure out how I can control the motor of my old scanner device and place a stick on it with some mass at the end. But maybe the motor control is too slow
<eintopf> I am sure I could do that with libusb and some control messages
<eintopf> for controlling a inverted pendelum...
<eintopf> s/a inverted/an inverted
<qi-bot> eintopf meant: "for controlling an inverted pendelum..."
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<kristianpaul> What that thing have to no need a dish at all..
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<wpwrak> grmbl. spamprobe started to hang. i don't like the possible pattern. new database, new luck ... for now ...
<wpwrak> hmm. nvidia degradation killed xclock. no update to small to potentially cause a hang. i guess i'll go shopping tomorrow ...
<zear> kristianpaul, your gps device also doesn't need a dish :)