#robotics Logs

Sep 25 2020

12:59 AM kerfluffy: anyone know what factors affect the precision of differential steering? suppose the aim is to move forward by 15mm and the wheels are 15cm in diameter.
01:06 AM kerfluffy: is moving forward generally accurate? is it just turning that's not so much?
01:09 AM rue_mohr: lots of how the wheels track on the surface
01:10 AM rue_mohr: they slip, but you cant really be sure where
01:10 AM rue_mohr: add feedback and it doesn't matter
01:30 AM kerfluffy: rue_mohr do you know what the trick is usually if encoders don't suffice?
01:30 AM kerfluffy: some sort of triangulation?
01:31 AM kerfluffy: but at 20mm, visual guidance probably won't be very precise
01:31 AM rue_mohr: vision is getting pretty good at tracking, I'm not that high level tho
05:42 AM Tom_itx is now known as Tom_L
06:47 AM Atomsk is now known as ace4016
06:51 AM ace4016: just an idea, but if you're concerned about slippage or tracking that you're moving where you meant or expected to be, you could go the route optical mice take (camera pointed at ground) to capture finer details, with other sensors tracking general location
06:51 AM ace4016: kerfluffy ^
06:55 AM ace4016: probably needs to adjust for elevation changes and potential chassis rotation (i'm assuming a vehicle of some sort >_>)
06:58 AM Phrkd is now known as Phreaked
08:01 AM mumptai: btw, using optical mice for odometry is a path that has not worked in every case i know of (4 teams tied)
08:48 AM ace4016: did they use the concept of what optical mice use or did they straight up use optical mice? (curious on details is all :P)
08:49 AM ace4016: optical and laser mice have their own set of issues, so i can imagine it wouldn't be a bullet proof solution
08:58 AM rue_mohr: cv
08:58 AM rue_mohr: camera pointed at a larger area of the ground
09:08 AM mumptai: my references all used cmos image sensor based mouse sensors. it mostly worked, but all went for laserscanner based slam or passiv odometry wheels with high-res encoders
09:14 AM rue_mohr: go with what you can afford. I mean, if the university is paying, the sky is the limit. (and if your sharp, you know they will throw it out after your done, so you can snag and sell it ( one of the few ways of making money by having gone to university))
04:51 PM polprog: rue_mohr: whos reverse delta?
04:51 PM Tom_L: imposters!!
04:52 PM polprog: guess we will wait
05:55 PM mrdata_ is now known as mrdata
08:38 PM rue_mohr: where??
09:23 PM mrdata: ?
09:58 PM SpeedEvil is now known as Guest36321