#robotics Logs

Jan 08 2022

10:53 AM Guts71: hey everyone
12:02 PM ace4016: ahoy
12:12 PM polprog: hello
03:13 PM rue_mohr: <select all the squares with 2.7k resistors> :)
03:14 PM rue_mohr: hows everyone doing?
03:14 PM rue_mohr: any robots in the works?
03:14 PM rue_mohr: who has what for servo systems?
03:14 PM rue_mohr: anyone got some force feedback happening?
03:15 PM rue_mohr: got a forward/reverse kinematics library on the go?
03:15 PM rue_mohr: Everyone putting operating systems on 8 mips microcontrollers with 1k of flash?
03:22 PM Steffanx: Im still learning about high/low pass PID filters.
03:34 PM rue_mohr: I and D are high and low pass filters
03:34 PM rue_mohr: look at the roll-off on a freq plot
03:35 PM rue_mohr: you need to realize that control signals are waveforms, regardless of them being pre-made or made on-the-fly
03:36 PM rue_mohr: regardless of them being 0.0001Hz or 20kHz
03:36 PM rue_mohr: regardless if their digital streams or analog streams
03:37 PM Steffanx: heh rue_mohr i wasnt entirely serious. i forgot my not-so-serious-face emoji
03:38 PM * rue_mohr shrugs
03:38 PM rue_mohr: I have to go buy cat food
03:39 PM Tom_L: should get some ppl food while you're out
03:39 PM rue_mohr: ....
04:21 PM rue_mohr: damn
04:21 PM rue_mohr: its light rain here
04:21 PM rue_mohr: there is a blizzard in town
04:22 PM rue_mohr: slipped 3 times on the way back, brakes were not an option
04:22 PM rue_mohr: glad there was nobody at the intersection!
04:22 PM rue_mohr: I was going thru with all 4 wheels locked anyhow
04:30 PM Tom_L: better stay home now
04:32 PM rue_mohr: well I can drive up and down the local rd
04:32 PM rue_mohr: more than that and it gets dodgy
04:33 PM Tom_L: a guy was asking about a programmer the other day
04:33 PM rue_mohr: cool
04:33 PM Tom_L: he'd had it a good 10 years
04:33 PM Tom_L: and finally broke i guess
04:33 PM Tom_L: told him i quit making them but now i feel bad
04:33 PM rue_mohr: hmm how old are mine now I wonder
04:34 PM rue_mohr: dont you have some parts you can round up for him?
04:34 PM Tom_L: how many do you have?
04:34 PM Tom_L: i have some i could send but really didn't wanna get into that again
04:34 PM Tom_L: i'd have to find them and i even forgot how to test them now
04:34 PM rue_mohr: recently you sent me a spare
04:35 PM rue_mohr: if you send him a good parts kit, he can probably work it out
04:35 PM Tom_L: i replied i wasn't making them now
04:36 PM Tom_L: switzerland
04:36 PM rue_mohr: hmm
08:31 PM Jak_o_Shadows: I tried doing that FPGA thing, and i'm not sure it was entirely working - just got stuck in the "generating HDL code" stage for hours
08:32 PM Tom_L: what fpga thing?
08:32 PM Jak_o_Shadows: I have a zynq 7010 - an ex-crypto-miner control board
08:32 PM Tom_L: ahh
08:32 PM Jak_o_Shadows: It's a dual ARM and logic board
08:33 PM Tom_L: i think i remember when you got that
08:33 PM Jak_o_Shadows: I want to get the toolchain working for the linux
08:33 PM Jak_o_Shadows: yeah
08:33 PM Jak_o_Shadows: Once I have the linux working in my own toolchain/image, I'll do SOMETHING with the FPGA
08:34 PM Tom_L: verilog or vhdl?
08:34 PM Jak_o_Shadows: I want to use the xilinx high level synthesis for now
08:35 PM Jak_o_Shadows: see how that goes
08:36 PM Tom_L: i found a really cheap xilinx dev board not too long ago
08:36 PM Tom_L: prior to that i have a digilent cpld board
08:37 PM Tom_L: it's really old now
08:38 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/temp/xilinx/Spartan6_1.jpg
08:38 PM Tom_L: old and the new
08:38 PM Jak_o_Shadows: I like the breakout board
08:39 PM Jak_o_Shadows: I should get that for mine
08:39 PM Tom_L: which?
08:39 PM Tom_L: the new one?
08:39 PM Tom_L: that other one is ancient
08:42 PM Jak_o_Shadows: https://ae01.alicdn.com/kf/H3bf387a019234265b5cb2a1b2d6483d7w/ZYNQ-7010-Development-Board-FPGA-A-R-M-Linux-Development-Vision-Development-Image-Acquisition-and-Processing.jpg_Q90.jpg_.webp the top board of this: https://ae01.alicdn.com/kf/H3bf387a019234265b5cb2a1b2d6483d7w/ZYNQ-7010-Development-Board-FPGA-A-R-M-Linux-Development-Vision-Development-Image-Acquisition-and-Processing.jpg_Q90.jpg_.webp
08:42 PM Jak_o_Shadows: ooops
08:43 PM Tom_L: ahh i see now
08:43 PM Jak_o_Shadows: It'll probably make a good robot control board - FPGA for stuff, ARM core for other
08:47 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1220593.jpg <--
08:48 PM rue_mohr: by using a common cathode display and a common anode display, you can "ruemux" two 7 segments onto 8 io lines :)
08:48 PM Tom_L: now this superstar is inventing new words too...
08:49 PM rue_mohr: hah, I better try to coin it early :)
08:53 PM rue_mohr: rueplex?
08:53 PM Tom_L: well i suppose.... charlie has one
08:53 PM rue_mohr: yea