#robotics Logs

Apr 14 2019

12:01 AM Malvolio is now known as Guest71562
01:52 AM rue_mohr: :)
11:19 AM gaze__: what's the equivalent to a shaft collar for smaller (3 mm) shafts where the forces are low when you want to retain a shaft between two fixed bearings? I'm thinking e-clips, circlips, push nuts maybe?
11:19 AM gaze__: but I don't much care for push nuts and am trying to think of how to precisely add a circlip notch to a shaft without a lathe
11:20 AM gaze__: maybe a drill and a dremel?
11:21 AM gaze__: well, groove not notch I should say
01:16 PM mumptai: ethernet, ethercat, can, can(openCAN), can(uavcan), usb, uart, i�c what's you favorite data-interconnect for robots?
01:34 PM veverak: depends :)
01:34 PM veverak: what fits the bill perfectly...
02:00 PM gaze__: uart is nice if you can get away with it since it's just such a developed way to talk to things using a computer
02:01 PM gaze__: so you can develop and debug all the pieces in isolation very easily... but there's absolutely no reason why you couldn't do that with any protocol and an appropriate converter
02:01 PM gaze__: it's just super easy with UART
02:02 PM gaze__: I should say that distance is a big qualifier here
02:02 PM gaze__: high speed SPI is appropriate for short distances and ethernet is appropriate for longer
02:03 PM gaze__: and of course it depends on whether you want real time capability
02:03 PM gaze__: noise immunity, topology... all these things.
02:03 PM gaze__: but all else being equal just use UART if you're a noob.
02:07 PM mumptai: uarts are also very acceptable for non-noobs ;)
02:21 PM veverak: gaze__: it also depends on hw
02:21 PM veverak: I select bus based on that usually...
02:21 PM gaze__: yeah that's true
02:21 PM veverak: hmmm, i2c sensor, i2c/spi sensor
02:21 PM veverak: I wonder what I will use... :)
02:21 PM gaze__: but sometimes it's uCs talking to uCs and most of them have a shitload of serial interfaces
02:22 PM gaze__: then you gotta pick
02:22 PM gaze__: or you have to choose a temperature sensor and they come in a SPI version, an I2C version, blablabla
02:22 PM gaze__: sometimes there's some choice involved
02:22 PM mumptai: also i/o of one mcu or fpga might not be enough
11:38 PM BillyZane2 is now known as BillyZane