#robotics Logs

Jan 11 2018

01:08 AM rue_: huh, the fft seems to kinda be working, I need to put meaningfull numbers in to check it properly
02:49 PM veverak: ok
02:49 PM veverak: what to use
02:49 PM veverak: as for "collision avoidance" sensor on robot ship
04:17 PM SpeedEvil: Over what range?
04:18 PM SpeedEvil: SONAR/LIDAR/RADAR/feelers/trained dolphins/
04:21 PM veverak: efficiently avoid bumbing into something?
04:21 PM veverak: I am thinking of the ultrasonic sensors around the edge of the boat
04:24 PM SpeedEvil: Your question is bad.
04:24 PM SpeedEvil: Stopping distance of an oil tanker is a kilometer or three
04:24 PM veverak: ah, sorry, misunderstood
04:24 PM veverak: 5m ?
04:25 PM SpeedEvil: stopping distance of a 5cm boat going at 1mm/s may be 1cm
04:25 PM veverak: +- 10cm is not problem obviously
04:25 PM veverak: or +- 30cm
04:25 PM SpeedEvil: LIDAR chips are pretty cheap at that range.
04:25 PM SpeedEvil: As is ultrasound.
04:25 PM veverak: even maybe 1m
04:25 PM veverak: lidar seems expensive
04:26 PM veverak: lidar chips seem expensive
04:36 PM SpeedEvil: $5 per
04:41 PM veverak: ?
04:41 PM veverak: link? :)
04:43 PM SpeedEvil: http://www.st.com/en/imaging-and-photonics-solutions/vl53l0x.html
05:28 PM ace4016: https://singularityhub.com/2018/01/11/low-cost-soft-robot-muscles-lift-200-times-their-weight/#sm.0000lpztsiqb8eg2t4g1gv0axq8ov
06:25 PM veverak: SpeedEvil: thanks!
07:11 PM robotustra: omg
07:11 PM robotustra: run stepper servo
07:12 PM robotustra: 20 rps or even faster
07:12 PM robotustra: dangerous to keep in hands
07:43 PM rue_: ace4016, twisted line?
07:44 PM rue_: didn't get much of a look before the popup took it all away, but ok
07:46 PM veverak: so
07:46 PM veverak: Concepts in C++11? done!
07:46 PM veverak: :)
07:51 PM ace4016: not sure what it is exactly, but looks like a hydraulic twisty thing
08:06 PM robotustra: looks like 2000 steps per rotation is OK
08:06 PM robotustra: will use this setting
08:07 PM Tom_L: ok i fixed my pendant today that's about it
11:21 PM rue_: mrdata,
11:21 PM rue_: THE WHOLE...
11:22 PM rue_: the whole thing about using 1 letter variable names starts to make more sense if you think about it in terms of space on punch cards
11:23 PM rue_: the listing I'm looking at, has a bunch of spaces between the first row (C or label number) and the first command character
11:24 PM rue_: I dont know if thats acutal space or just the way it was printed
11:27 PM rue_: if I make a set of punch cards for this I'm just going WAY too far