#robotics Logs
Jan 03 2018
#robotics Calendar
12:04 AM orlock: rue_mohr: 114ms high, 190ms low, i count 33 pulses a second
12:07 AM orlock: 114+190=304, 304*33 = 10032
12:07 AM rue_mohr: orlock, ?
12:07 AM orlock: counting stepper pulse timing of the factory controller of mmy "new" telescope mount
12:07 AM rue_mohr: thats not hobby servo
12:07 AM rue_mohr: ah
12:07 AM orlock: so i can give it a brain transplant
12:07 AM rue_mohr: again?
12:07 AM orlock: this mount doesnt suck
12:07 AM rue_mohr: didn't you do that 8 years ago?
12:07 AM orlock: yeah, and i reached the physical limits of the mount
12:07 AM orlock: the new mount has the motors integrated properly, and actual bearings
12:07 AM rue_mohr: did you take pics of the space ship as it went by?
12:07 AM orlock: no play or slop
12:07 AM orlock: no :-(
12:07 AM rue_mohr: some greeting we all provided
12:07 AM orlock: hmm, so, each pulse is actually two steps isnt it?
12:07 AM rue_mohr: no
12:07 AM rue_mohr: ?
12:07 AM rue_mohr: oh, on the motor?
12:07 AM orlock: if i'm looking at a pin on a stepper
12:07 AM orlock: yes
12:07 AM rue_mohr: k, cause the other phase would pulse in that time too
12:08 AM orlock: yes - so i actually want to double the frequency to get the step rate i want to feed to the stepper driver
12:08 AM rue_mohr: wait 4 wire steppers or 5/6wire?
12:09 AM orlock: 6 wire, acting as a 4 wire
12:09 AM rue_mohr: ok
12:09 AM orlock: it runs in a "low power" mode that only energises half the coils
12:09 AM orlock: and there is a relay when engages when you set it to move rapidly
12:10 AM rue_mohr: A4988 ?
12:10 AM rue_mohr: cause the current one is running a pic isn't it?
12:10 AM orlock: the factory driver is using..
12:11 AM orlock: AT89S51 mcu
12:11 AM orlock: 3x ULN2k3AN's
12:11 AM rue_mohr: thats not 4 wire
12:11 AM rue_mohr: thats 5 or 6 wire
12:11 AM orlock: 16 FET's
12:11 AM rue_mohr: ... what!?
12:11 AM rue_mohr: wtf
12:12 AM rue_mohr: so wait, their running an 8051 thru 3 uln2003 to drive 16 fets?
12:12 AM rue_mohr: 4 motors?
12:12 AM orlock: 2 motors
12:12 AM rue_mohr: wtf
12:12 AM orlock: 1x 4 wire, 1x 6 wire, exact same specs
12:15 AM rue_mohr: ok
12:15 AM rue_mohr: that actually might make sense
12:16 AM rue_mohr: 4 wire motor requires 8 fets
12:16 AM rue_mohr: the 6 wire motor needs 4 fets
12:16 AM rue_mohr: wtf are the other 4 fets for
12:16 AM rue_mohr: it must be set up so you can use 2 4 wire motors
12:16 AM rue_mohr: otherwise it'd have 12 fets
12:17 AM rue_mohr: 2003 is a 7 channel driver
12:17 AM orlock: http://en.crypt.net.au/Assorted/HEQ5_Driver_Board.jpg
12:17 AM rue_mohr: out of all the stupid things in the universe
12:17 AM rue_mohr: so thats 21 channels
12:17 AM orlock: rue_mohr: yes, it treats the 6 wire as a 4 wire
12:17 AM rue_mohr: yea, each 4 wire motor requires 8 fets
12:17 AM orlock: there is also a handset
12:18 AM rue_mohr: uh
12:18 AM rue_mohr: do you have a copy of the firmware?
12:18 AM orlock: in that image, leftmost connector is for handset/power, middle/right is the 4 wire motor, far right is the 6 wire motor (not connected, probing)
12:18 AM orlock: nope, ijus twant the timing
12:19 AM rue_mohr: is the timing constant or eliptical?
12:19 AM orlock: timing is constant, square waves
12:20 AM rue_mohr: huh
12:20 AM rue_mohr: I wonder if they locked the firmware
12:20 AM rue_mohr: who bothers setting the lock bit, right?
12:20 AM orlock: dunno, i dont see it having much of value
12:21 AM rue_mohr: what do you want to change?
12:21 AM rue_mohr: their not using current mode on the steppers so they must be voltage rated
12:22 AM orlock: 12v
12:22 AM rue_mohr: which means their slow as all ****, but its a telescope...
12:22 AM orlock: i see them getting 10v via the 'scope
12:22 AM rue_mohr: yea, cause those are bipolar transistors with 2V drop
12:22 AM rue_mohr: but whats the relay do?
12:23 AM orlock: for "fast" slew speeds
12:23 AM rue_mohr: super simple board
12:23 AM orlock: turns the 6 wire stepper into 4 wire
12:23 AM rue_mohr: that dson't make sense...
12:23 AM rue_mohr: but ok
12:24 AM orlock: you can drive a 6 wire stepper by energising only half the coils, right?
12:24 AM orlock: so you get less torque but consume less power?
12:24 AM rue_mohr: typically its the cnetertap you drop
12:24 AM rue_mohr: but I got ya, I think their cheating
12:24 AM orlock: anyway, the relay is for that
12:25 AM rue_mohr: reprap relays for the win?
12:25 AM orlock: but what I want is to only reuse the motors, do away with this board
12:25 AM rue_mohr: er, reprap steppers?
12:25 AM rue_mohr: nice current mode steppers with a switcing A4988 driver
12:25 AM orlock: these motors have gearheads built in
12:25 AM rue_mohr: that has microstepping and shutdown
12:25 AM rue_mohr: ah
12:25 AM orlock: so i'll be wanting to keep them
12:26 AM orlock: but i should be able to drive them with an A4988 anyway?
12:26 AM rue_mohr: yea, not ideal
12:26 AM rue_mohr: lots of inductance and no current mode advantage
12:26 AM rue_mohr: unless you feed them 24V
12:27 AM orlock: i only care about it turning at exactly the correct speed
12:27 AM orlock: which is slowly
12:27 AM rue_mohr: your on battery aren't ya?
12:27 AM orlock: nope
12:27 AM rue_mohr: oh
12:27 AM rue_mohr: k
12:27 AM orlock: i can be, but wont be - not a concern
12:27 AM rue_mohr: so... why ditcht eh old board?
12:27 AM orlock: what is a concern is the lack of any USB or serial capability
12:28 AM rue_mohr: ... for...
12:28 AM orlock: computer interface
12:28 AM rue_mohr: yea, to tell it to do what tho
12:28 AM orlock: automated routines for use in calibrating the mount position is one thing
12:29 AM orlock: otherwise i have to sit there watching a timer for 20 minute exposures
12:29 AM rue_mohr: 114ms high, 190ms low, i count 33 pulses a second
12:29 AM rue_mohr: I wonder why its lopsided
12:29 AM orlock: the high/low? yeah
12:30 AM orlock: why not 150 each
12:30 AM rue_mohr: oh, maybe they ahve a relax in the middle
12:30 AM rue_mohr: it would be good to watch both channels
12:30 AM rue_mohr: but awkward
12:30 AM rue_mohr: have a logic analizer?
12:30 AM rue_mohr: and 4 optos?
12:31 AM rue_mohr: and 2 1k resistors?
12:31 AM orlock: I've got a TDS2024C, but only two probes
12:31 AM rue_mohr: old computer power supply , 2x PC817?
12:31 AM rue_mohr: 4 pin opto isolator?
12:32 AM rue_mohr: if you watch the drive of one phase, you can see forward/reverse/off
12:32 AM rue_mohr: might be more enlightening
12:32 AM rue_mohr: if you want, 33pps might be all you want to know
12:32 AM rue_mohr: second or arcsecond?
12:33 AM orlock: second
12:34 AM rue_mohr: :) how many pulses per arcsecond
12:34 AM rue_mohr: jk
12:34 AM rue_mohr: are you good or elbow deep in an old computer power supply?
12:36 AM rue_mohr: oh god, I'm an idiot
12:36 AM rue_mohr: this is a switched capacitor filter
12:37 AM rue_mohr: I can use it to sweep the incomming signal and get a spectrum
12:37 AM rue_mohr: great, that'd be option D
12:37 AM rue_mohr: oooooh
12:37 AM rue_mohr: now I have to think
12:40 AM orlock: http://en.crypt.net.au/Assorted/HEQ5_Pulses_250ms.jpg http://en.crypt.net.au/Assorted/HEQ5_Pulses_25ms.jpg
12:41 AM orlock: rue_mohr: samples at 250ms and 25ms
12:41 AM rue_mohr: bingo
12:41 AM rue_mohr: so they have deadtime between the pulses
12:42 AM orlock: ok, what does that mean?
12:42 AM rue_mohr: the motors aren't always on
12:43 AM rue_mohr: their only on for 113ms
12:43 AM orlock: 114 i counted
12:43 AM orlock: :)
12:43 AM rue_mohr: over the period of 190ms
12:44 AM rue_mohr: off for 76ms/cycle
12:44 AM rue_mohr: keeps motor cool, saves power
12:44 AM orlock: but all i care about is having it turn at the same rate
12:44 AM rue_mohr: ok
12:46 AM orlock: so i take the 33 times a second of the pulses i see - double it to get the actual motor step rate
12:46 AM orlock: so 66Hz
12:46 AM rue_mohr: yes
12:46 AM orlock: so 150ms per step
12:47 AM orlock: or 151
12:47 AM rue_mohr: my eyes are not staying open
12:47 AM orlock: awesome, thanks for your help
12:47 AM rue_mohr: 15152 us
12:47 AM * orlock gives the DSO back to the electronics lab
12:47 AM rue_mohr: orlock, get a logic analizer
12:47 AM rue_mohr: usb one
12:48 AM rue_mohr: their cool, 8 things at once
12:48 AM rue_mohr: digital capture
12:48 AM rue_mohr: gngiht
12:51 AM rue_bed: so
12:52 AM rue_bed: I tasked myself with building this audio filter
12:52 AM rue_bed: and taking down the christmas tree
12:52 AM rue_bed: the tree is still up, and there is a breadboad w/components box on the desk
12:52 AM rue_bed: hmm
08:50 AM veverak: :)
06:30 PM rue_mohr: anonnumberanon, ok, homework check,
06:30 PM rue_mohr: what is the maximum pulse tiem for a hobby servo
06:30 PM rue_mohr: what is the pulse rate for a hobby servo
06:33 PM Tom_L: 2ms and 30ms
06:38 PM * rue_mohr hits tom with an unbrella a few times
06:38 PM rue_mohr: the questions are for anonnumberanon
06:39 PM Tom_L: put that thing away, it's not raining
06:40 PM rue_mohr: we had HEAVY fog here today
06:41 PM rue_mohr: 75-400 feet visability
06:42 PM rue_mohr: THAT slows traffic down good
06:42 PM rue_mohr: oh I got a peice of metal that might work for a spindle
06:42 PM rue_mohr: its a pin of some kind
06:43 PM rue_mohr: might be hardened to ****, dunno yet
06:43 PM rue_mohr: its got about a 3/4" hole down the middle
06:44 PM Tom_L: might work
06:45 PM Tom_L: what sort of taper are you thinking about?
06:45 PM rue_mohr: I cant remember the name for a rugh peice of metal thats almost what you want but needs shaping
06:46 PM rue_mohr: MT2, for that chuck I got
06:46 PM rue_mohr: the cheat is to put an MT2 in the chuck and match the angle
06:46 PM rue_mohr: the 3/4 can do the draw bar
06:47 PM rue_mohr: maybe about 1/2" hole
06:47 PM rue_mohr: I have to remember to pull it out of thw work van
06:47 PM rue_mohr: but it'd take a cutting torch to get my ass out of this chair right now
06:48 PM rue_mohr: then I have to say farwell to the christmas tree
06:49 PM rue_mohr: I'm conflicted tho
06:49 PM * Tom_L takes a striker to the torch
06:49 PM rue_mohr: I want directy drive, but I cant pull it off
06:49 PM Tom_L: on the spindle?
06:49 PM Tom_L: not many are
06:49 PM rue_mohr: yea
06:49 PM Tom_L: not even commercial ones
06:50 PM Tom_L: either belt or gear
06:50 PM rue_mohr: I think there is more advantage to having the pullies
06:50 PM Tom_L: ^^
06:50 PM Tom_L: i'm wondering what sort of motor i would use on mine
06:50 PM * rue_mohr puts the washing machine motor back on the bench
06:51 PM rue_mohr: their easy to get ya know
06:51 PM Tom_L: i had one of those with the control
06:51 PM rue_mohr: those bearings and seals fail OFTEN
06:51 PM rue_mohr: every person on the planet apparently has to individually learn not to buy a front loading washing machine
06:52 PM Tom_L: controlling it is my issue
06:52 PM rue_mohr: by doing it
06:52 PM Tom_L: apparently
06:52 PM Tom_L: i fixed mine at least 3-4 times
06:52 PM rue_mohr: 8|
06:52 PM rue_mohr: bearing or seal?
06:52 PM Tom_L: bearing
06:52 PM Tom_L: both got replaced
06:53 PM Tom_L: i've done the one that replaced it once so far
06:53 PM rue_mohr: jester, who worked as a repairman for a while, said the bearings are the clintch
06:53 PM Tom_L: my first set lasted 30 years
06:53 PM rue_mohr: yea, my machines are 25-30
06:53 PM rue_mohr: I'm just gonna replace parts
06:53 PM Tom_L: that's what i do
06:54 PM rue_mohr: cause for less money I can keep them going longer than a new one will last
06:54 PM Tom_L: but they do 1-2 loads daily
06:54 PM Tom_L: minimum
06:54 PM rue_mohr: so far, the washer has needed a plastic piece for its water spout fixed up, and new aggitator dogs
06:55 PM rue_mohr: the dryer needed a new ignitor, belt, ... everything else I replaced it didn't need...
06:55 PM rue_mohr: I put one belt on wrong and it ate it
06:55 PM rue_mohr: that hurt
06:56 PM Tom_L: i'm gonna take the night off on the mill
06:56 PM Tom_L: been kindof a SH** day
06:56 PM rue_mohr: ..... I cant correct that sentance
06:56 PM rue_mohr: oh got it
06:56 PM rue_mohr: ok
06:56 PM rue_mohr: 1-2loads /day!?
06:56 PM Tom_L: yes
06:57 PM anonnumberanon: rue_mohr what do you mean by pulse time and pulse rate
06:57 PM rue_mohr: geez, I do 1-2 loads a week
06:57 PM Tom_L: you're a party of one though
06:57 PM rue_mohr: anonnumberanon, the pulse time is varried to set the servo position, there is a minimum and maximum time for the pulse, I want you to tell me what the max pulse time is
06:57 PM Tom_L: haha
06:58 PM Tom_L: you had to ask?
06:58 PM rue_mohr: +- mother and some people using it
06:59 PM orlock: rue_mohr: front loaders are more effecient though?
06:59 PM rue_mohr: orlock, not on the wallet
06:59 PM Tom_L: not that i can tell
06:59 PM orlock: rue_mohr: I guess you don't suffer from near constant drought then?
06:59 PM rue_mohr: prolly a few hundred bucks if your a person who has to call a repairman to fix it
07:00 PM rue_mohr: orlock, no...
07:00 PM rue_mohr: orlock, what country you living in right now?
07:00 PM orlock: Australia
07:00 PM rue_mohr: australia or usa?
07:00 PM rue_mohr: ok
07:00 PM rue_mohr: so your already on rainwater or city water?
07:01 PM orlock: city water, need to get the rain tanks installed
07:02 PM rue_mohr: I think rifrafs tank was bout 21 m^3
07:03 PM rue_mohr: I have 1m^3 at the greenhouse and 1 under the house
07:06 PM rue_mohr: anonnumberanon, I'm not trying to pick on you....
07:07 PM rue_mohr: you seem to need help with direction and progression method
07:13 PM anonnumberanon: What does that mean?
07:14 PM rue_mohr: so, I worked out that a bunch of the parts I got are for the mechas solinoid drivers
07:14 PM rue_mohr: 1000 200 ohm resistors, 200 1n4007 diodes, 100 pc817 opto isolators
07:14 PM rue_mohr: so that thing that flew by us was a shard
07:14 PM rue_mohr: shards dont fly solo
07:25 PM anonnumberanon: About to snow here in 5 hours.
07:25 PM anonnumberanon: Snow makes me hyper.
07:49 PM * rue_mohr wakes up
07:49 PM rue_mohr: !??!?!?!
07:51 PM rue_mohr: orlock, you ever done fft code?
07:52 PM orlock: nope
07:53 PM orlock: i have arduino with a4988 and the old telescope driver both hooked up to the DSO now
07:53 PM rue_mohr: :) wow
07:53 PM rue_mohr: didn't take ya long
07:54 PM rue_mohr: want help with the timer code?
07:54 PM veverak: ok
07:54 PM veverak: so
07:54 PM rue_mohr: ok its dark, I'm going to go chuck my xmax tree into the neighbours yard, brb
07:54 PM veverak: I have collission deteciton
07:54 PM veverak: for any shape
07:54 PM veverak: (3D shape)
07:55 PM veverak: with metaprogramming
07:55 PM veverak: means, the code is generated "specifically" for each combination of collission detection used
07:55 PM veverak: in a way, that should take the most out of effeciency
07:55 PM veverak: :)
07:55 PM veverak: *efficiency
08:01 PM orlock: rue_mohr: nah, seems good.. i have time between steps set to 38ms
08:01 PM orlock: and the driver output is giving me a combined on/off length of about 304ms
08:02 PM orlock: should just be a matter of adjusting it properly for the last few ms
08:02 PM orlock: which i'll actually figure out by pulses per second or two
08:03 PM orlock: shame the bloody USB port on this oscilloscope doesnt work
08:11 PM rue_shop3: my origional cnc uses direct drive, its got a weed eater motor, the tack is a belt-driven dc motor
08:12 PM rue_shop3: the new machine I made, uses a 1:1 to the motor, uses an optical tach on the spindle
08:12 PM orlock: weed eater = line trimmer?
08:12 PM rue_shop3: yea
08:12 PM rue_shop3: :)
08:12 PM rue_shop3: I have it on a 80VDC pwm system
08:12 PM orlock: ahh, mine is 2 stroke
08:12 PM rue_shop3: hah
08:13 PM orlock: you know that crappy line advance mechanism they all have?
08:13 PM orlock: bump a thing and it centrifuges out?
08:13 PM rue_shop3: supposedly
08:13 PM orlock: yeah, thats the one
08:13 PM orlock: the but you "bump" on ours is about to crack/fall apart
08:13 PM rue_shop3: my gas one , you have to stop, pull the spool and turn it by hand
08:14 PM orlock: so... i guess i'll have a spare tiny 2 stroke moror spare
08:14 PM rue_shop3: :)
08:15 PM Tom_L: rue_shop3, use the tree for fuel for your heater
08:16 PM Tom_L: duh
08:16 PM rue_shop3: too late
08:34 PM orlock: 85 pulses / 2500ms on the arduino
08:35 PM orlock: 85 pulses / 2500ms on the HEQ5
08:37 PM orlock: arduino timer value of 37ms, and the pulses from the factory controller drift to the right
08:37 PM orlock: 38ms and they drift to the left slowly
08:38 PM * orlock changes to micros() instead of millis() for added resolution
08:43 PM rue_mohr: you can tune with an extra Nop or two
08:43 PM rue_mohr: or, use the hardware timer
08:44 PM rue_mohr: in either case, you might be subject to clock drift
08:44 PM rue_mohr: dunno if the arduino is usually quarts or ceramic
08:44 PM orlock: its not clock drift, its just the timing interval being off by 50microseconds or so
08:45 PM rue_mohr: there are 3 cnc machines going in the shop, I'm staying in the house.
08:45 PM Tom_L: ?
08:46 PM Tom_L: you can't run them from there
08:46 PM rue_mohr: 1 nop = .625uS
08:46 PM rue_mohr: its too noisy in there
08:46 PM Tom_L: put a box over em
08:46 PM rue_mohr: ZZZZZZZZZZZZRRRRRRRRRREEEEEEEEEEEEEZZZZZZZZZZZZZZZZZMMMMMMMMMMMMMZZZZZZZZZZZZ
08:47 PM Tom_L: you hear something long enough, you won't even notice it after while
08:47 PM rue_mohr: one of them is chattering, doing the NYENG NYENG NYENG thing
08:48 PM Tom_L: case in point... 912 when all flights were grounded
08:48 PM Tom_L: it was errie
08:48 PM rue_mohr: your over a number of flight paths eh?
08:48 PM rue_mohr: we have a jet go over every so often, thick rumble
08:48 PM Tom_L: they're constant but i don't really hear them
08:49 PM Tom_L: airport is maybe 5mi away and the air base is the other direction
08:49 PM rue_mohr: theBear, used to live right under the runway path
08:49 PM Tom_L: oh and they do test runs on engines once in a while at the factories
08:49 PM Tom_L: i'm not under it
08:49 PM Tom_L: but it's a presence
08:51 PM orlock: 37810 microseconds
08:52 PM Tom_L: i'm a little pissed about my Y axis
08:52 PM Tom_L: i welded the end in before i had holes drilled to mount it
08:53 PM Tom_L: now i'm faced with changing the way i mount the motor
08:57 PM orlock: factory controller gives me 302.4ms on/off lenth, arduino controller gives me 302.8ms on/off
08:58 PM rue_mohr: 640 nops in .4ms
08:58 PM rue_mohr: so you want 320 nops
08:58 PM rue_mohr: ;)
08:58 PM orlock: that on/off cycle is actually 4 steps though
08:58 PM orlock: 2 steps while its on, 2 steps while its off
08:59 PM * rue_mohr throws a bucket of numbers in and air and runs away
08:59 PM orlock: takes me back to a flat 3780microseconds though
08:59 PM orlock: 37800
10:31 PM anonnumberanon: <rue_mohr> 1 nop = .625uS
10:31 PM anonnumberanon: no man
10:31 PM rue_mohr: 1 cycle
10:31 PM rue_mohr: 16Mhz
10:31 PM rue_mohr: whats 1/16000000
10:32 PM anonnumberanon: you tell me
10:32 PM rue_mohr: anonnumberanon, whats the maximum pulse time for the control pulse of a hobby servo
10:32 PM * Tom_L raises a hand
10:32 PM rue_mohr: how about anonnumberanon in the back...
10:32 PM rue_mohr: anonnumberanon, can you answer this one?
10:33 PM anonnumberanon: too late, the burden of answering a simple question is already on you!!!
10:33 PM anonnumberanon: yes Tom_L ?
10:34 PM anonnumberanon: rue_mohr, you'll need to say "I was wrong"
10:34 PM anonnumberanon: also
10:34 PM rue_mohr: did I miss a zero on the instruction time?
10:34 PM anonnumberanon: otherwise I cannot consider you or your questions seriously anymore
10:35 PM rue_mohr: units 1/16Mhz us
10:35 PM rue_mohr: * 0.0625
10:35 PM rue_mohr: yep, apparently I missed a zero
10:37 PM rue_mohr: I have a 591 page book on fourier analysis, and I think there is _ONE_FREAKING_PARAGRAPH_ about fft
10:39 PM anonnumberanon: orlock, are you still struggling with micros() or did it fix your resolution problem?
10:44 PM rue_mohr: anonnumberanon, so, in 2 days you cant tell me the maximum pulse time for positioning a hobby servo...
10:44 PM * rue_mohr goes back to the brick wall
10:45 PM anonnumberanon: im not trying rue_mohr
10:45 PM anonnumberanon: i dont have time
10:46 PM anonnumberanon: especially when i know you know, it's stupid
10:46 PM rue_mohr: I want you to know, and learn other stuff finding out
10:46 PM rue_mohr: if you dont even know the max pulse time to position a servo, HOW you gonna write code to generate the pulses?
10:47 PM anonnumberanon: by writing the best possible code to generate any pulses
10:47 PM rue_mohr: yea, a whole book on fourier analysis, and they say almost nothing about fft
10:47 PM anonnumberanon: that's how you do engineering
10:47 PM rue_mohr: ok
10:47 PM anonnumberanon: so things work most of the time
10:47 PM anonnumberanon: without having to know the rest
10:51 PM rue_mohr: so, your making a generic current limiter without knowing how microstepping works, ok
11:00 PM rue_mohr: I dont know if my fft bin calculator works
11:00 PM rue_mohr: everyone seems to have different numbersthan evveryone else
11:00 PM rue_mohr: I line up with like half of them
11:06 PM orlock: hmm
11:06 PM orlock: two seperate data inputs
11:06 PM orlock: is there a way i can offset only one source?
11:07 PM rue_mohr: no
11:07 PM orlock: even on this fancy-pants dso?
11:07 PM rue_mohr: I dont think so
11:07 PM rue_mohr: lets see what the front looks like again?
11:07 PM orlock: TDS 2024C
11:08 PM rue_mohr: I'm already googling fft basics
11:30 PM anonnumberanon: orlock, these three signals seem to have an offset... what do you mean? should be one of your knobs for "vertical position"
11:30 PM anonnumberanon: https://www.tek.com/sites/default/files/media/image/Tek-tds2024c_02a_h_1.jpg
11:38 PM orlock: anonnumberanon: magic
11:38 PM orlock: MAGIC
11:38 PM * orlock wonders how the signals are auto-magically appearing
11:40 PM anonnumberanon: CS people are very jealous of the EE people for having the oscilloscope...
11:40 PM orlock: we have lots of both
11:42 PM orlock: anonnumberanon: my employer's parent company used to own both Fluke and Tektronic
11:42 PM orlock: we design our own stepper motor control boards here
11:42 PM orlock: but i am doing this just for myself
11:42 PM anonnumberanon: I'm full CS coming from EE education and trying to get back to a more EE position right now.
11:43 PM rue_mohr: for microstepping, do you have to have multislope current control?
11:43 PM anonnumberanon: Not totally EE but dealing with electronics. Most jobs for EEs right now at least around where I live deal with lighting in buildings.
11:43 PM anonnumberanon: I don't want to do that.
11:44 PM orlock: Here, electricians do that stuff
11:44 PM orlock: EE's do other stuff
11:44 PM orlock: the last EE i worked with closely was a phd, and did embedded/network systems architecture
11:49 PM anonnumberanon: it's blizzard day today :)
11:50 PM Atomsk is now known as ace4016