#robotics Logs

Mar 08 2012

04:41 Crystalline Hello again c:
04:59 Crystalline Has anyone used the FEZ Panda II before?
08:29 rue_house rotary encoder, you put a spinning magnet infront of the chip
08:29 rue_house AS5040, I think I'v heard of that before
08:37 rue_house their code example isn't quadrature decoding, you could double the resolution
08:38 rue_house wait, they want $50 for that?
08:38 rue_house why not just use a optical encoder? cheaper than $50
08:38 rue_house esp for just 1024 lines...
08:42 rue_house thats halarious, the chip HAS a step/direction mode, which the code they posted could read at full resolution
08:42 rue_house and they didn't break out the index pulse
08:43 rue_house it has a 3 phase output too, huh
08:55 rue_house The magnet?s center axis should be aligned within a displacement radius Rd of 0.25mm from the defined center of the IC
08:55 rue_house ' '
08:55 rue_house there is trickey
08:58 rue_house '610 rpm is the maximum speed, where 1024 readings per revolution can be obtained.'
08:59 rue_house hmmmmm
08:59 rue_house delinquentme,
09:00 delinquentme howdy rue!
09:00 delinquentme sorry im in serverland .. bitching about my RVM setup on ec2 hahaha
09:00 delinquentme working on a chemical parser atm :D
09:02 rue_house ^ info about the magnetic encoder
09:02 rue_house it seems digikey dosn't currently stock ANY optical encoders...
09:03 delinquentme it was a $45 dollar sensor? i missed that
09:05 Triffid_Hunter I have some AS5040s floating around somewhere
09:06 Triffid_Hunter interesting little chips.. for reference, above 610RPM they skip steps which isn't a problem if you use the internal counter over SPI rather than quadrature or step/dir
09:07 delinquentme OOO someone in #hplusroadmap said they found a brushless motor supplier with motors which exceed like 60k rpms or something like that
09:07 delinquentme 60k sounds hella high but i know it wasnt 6000
09:07 rue_house http://search.digikey.com/ca/en/products/HEDM-5500%23B06/516-2018-ND/1990416
09:07 delinquentme ##hplusroadmap ** rather
09:07 rue_house 1000 lines, $50
09:08 rue_house http://search.digikey.com/ca/en/products/600128CBL/600CS-ND/53504 << were down to 128 lines tho
09:10 delinquentme yeahh thats kind of what I was expecting
09:12 rue_house you can do a rotary lvdc with that same circuit tho
11:29 monode hello.
11:29 monode i'm trying to figure out how to make an extruder for spiral shapes, say, like fusilli pasta
11:30 monode my guess is that it's twisted insde, and the material is pushed through the twist
11:31 monode but i can't figure out why a) the spiral won't come out wrong, ie - twist on the outside and b) how to actually make such a die
20:50 rue_house only charged me $100 to move the greenhouse
20:51 rue_house so I tricked him into $120 and told him if he ever needs anything welded I'm happy to do it
22:16 rue_house http://hackedgadgets.com/2006/07/10/home-built-laser-projector/
22:16 rue_house I FOUND IT!!!
22:16 rue_house thats the project!!!!
22:21 rue_house http://elm-chan.org/works/vlp/report_e.html
22:25 rue_house !bookmark VLDC variable capacitor sensor position projector laser vector http://elm-chan.org/works/vlp/report_e.html