#robotics Logs
Dec 08 2017
#robotics Calendar
08:50 AM rue_mohr: anonnumberanon, finishing touches day, you keeping up?
09:50 AM anonnumberanon: i foresee a power supply challenge
09:51 AM anonnumberanon: got mcu to control whatever i want but not really any power supply available for whatever motors i find in those printers
09:52 AM anonnumberanon: unless i can somehow piggyback onto the power supplies in the printers
11:18 AM anonnumberanon: supply and control
12:24 PM z64555: switch-mode power converters are a good project
12:25 PM anonnumberanon: yeah
12:25 PM anonnumberanon: but I'll try to hook up to the supply in the printer
12:25 PM anonnumberanon: or else I lose the challenge
12:26 PM anonnumberanon: I have till tonight.
01:05 PM rue_mohr: anonnumberanon, computerpower supply has 5 and 12V
01:05 PM rue_mohr: otherwise and 12+V power wart from the basket in the second hand store will do just fine
01:07 PM rue_bed: 1A motor != 1A power supply, todays new motor drivers are constant power switching, you have to look at the wattage of the motor if you know it
01:08 PM rue_bed: a coil rating of 0.8V 4A on a motor only needs 1.875A from a 12V power supply ( 2 coils)
01:09 PM rue_bed: voip phones usually have adapters between 22 and 48V
01:09 PM rue_bed: which is spooky cause its enough to REALLY BLOW UP anything else people plug them into
01:10 PM rue_bed: most peoples take on power adapters is that if it fits it must be ok
01:11 PM rue_bed: I'v seen 5Vdc things doing the funkey chicken cause they were given a 9VAC adapter
01:17 PM anonnumberanon: you saw my printers?
01:17 PM rue_bed: no
01:18 PM rue_bed: yes
01:18 PM rue_bed: those are good
01:18 PM rue_bed: mostly 1 brushless and a bunch of clutches, but should have a few motors
01:19 PM rue_bed: look for the ones with scanners
01:19 PM rue_bed: the mutlifunction ones
01:19 PM rue_bed: if they have a scanner and a document feeder, thats 2 good motors garunteed
01:19 PM rue_bed: like, really good motors
01:20 PM durrf2: the printers i took apart pretty much all had steppers in them
01:20 PM durrf2: oh i was scrolled up
01:20 PM rue_bed: :)
01:20 PM durrf2: wow but its still relevant
01:21 PM durrf2: but they were older then the ones in that picture
01:21 PM rue_bed: yes
01:21 PM rue_bed: most newer lasers are one motor (maybe brushless, maybe a stepper) and a whooole bunch of clutches
01:22 PM rue_bed: :) i just figured out what an m3u file is! I already knew, but I'd forgotten
01:23 PM durrf2: i sort of want to say playlist but thats probably wrong judging from the channel
01:23 PM durrf2: lol
01:23 PM rue_bed: yup, its a winamp playlist
01:23 PM durrf2: whoo
01:24 PM rue_bed: I'm ill, so I'll be going in and out of conciousness today
01:24 PM durrf2: sick
01:24 PM anonnumberanon: rue_bed, 50/50 ?
01:25 PM anonnumberanon: the bait was not taken...
01:25 PM * rue_bed pulls sheet back over head
01:26 PM * rue_bed notes he needs to fix the sheets on the bed and finds the blanket...
01:30 PM anonnumberanon: rue_bed, milling your own PCB yet?
01:34 PM rue_bed: I dont beleive in milled pcbs
01:34 PM rue_bed: I have an etching setup
01:34 PM rue_bed: I make a run of boards about every 2 years, usually in winter
01:35 PM rue_bed: heater loves that
01:51 PM z64555: *milled* pcbs?
01:52 PM z64555: sounds like something I'd do if I couldn't make an etched pcb
02:10 PM anonnumberanon: if you have a cnc it's easier than etching
02:10 PM anonnumberanon: etching is all these different steps
02:10 PM anonnumberanon: cnc mill is just attach board firmly to cnc table and push start
02:16 PM z64555: I'm skeptical about it
02:21 PM durrf2: :( when i need a board made i just bust out the perfboard or hwatever this generic breadboard stuff is
02:24 PM -!- #robotics mode set to +o by verne.freenode.net
02:30 PM rue_mohr: most of the time, for the one-off stuff, thats a fine way to go
02:30 PM rue_mohr: there are smt adapter baords for almost everything, and 0603 thru 0805 parts fit fine between pads
02:31 PM rue_mohr: 1206 if the pads are dedicated
02:32 PM Tom_L: ok, my fastener guy closes at 12 on friday.... dammit
02:32 PM rue_mohr: hah, burn.
02:32 PM Tom_L: nothing i needed
02:32 PM rue_mohr: christmas party?
02:32 PM Tom_L: i was gonna inquire about something for someone else
02:32 PM Tom_L: normal hours
02:33 PM rue_mohr: ah
02:33 PM rue_mohr: our fastner people are open on saturday now!
02:33 PM rue_mohr: till about 2 I think
02:33 PM Tom_L: i _was_ gonna swap the screws i got for SS but i'll just keep what i got
02:33 PM rue_mohr: SS is brittle
02:34 PM ferdna: does anyone knows the output voltage of this bridge rectifier? GBU1005
02:34 PM ferdna: http://www.mouser.com/ds/2/395/GBU1001%20SERIES_I14-523397.pdf
02:34 PM ferdna: datasheet doesnt tell me...
02:34 PM ferdna: is it 12 or 24?
02:34 PM rue_mohr: it can do up to 400V
02:34 PM Tom_L: it depends on the input voltage
02:34 PM rue_mohr: er 420 sorry
02:35 PM ferdna: Tom_L, AC is input voltage
02:35 PM ferdna: rue_mohr, that is its max
02:35 PM Tom_L: so it's AC plus a few percent for DC
02:35 PM rue_mohr: the filtered, unloaded dc output is 1.4x the input votlage
02:35 PM Tom_L: ^^
02:35 PM ferdna: how do i know?
02:35 PM rue_mohr: what transformer are you using it with?
02:35 PM Tom_L: they make meters for such things
02:36 PM ferdna: ohhh
02:37 PM rue_mohr: all 10A , huh, I wonder if their just tested and graded down to what they come out to
02:37 PM rue_mohr: like transsitors with Hfe ratings
02:38 PM ferdna: it has a coil
02:39 PM rue_mohr: use more words or a photo
02:40 PM ferdna: ok
02:44 PM * rue_mohr concntrates
02:44 PM rue_mohr: ok, so an $8 string of christmas lights has 35 leds
02:44 PM rue_mohr: and, an $8 string of christmas lights, has 35 leds
02:46 PM rue_mohr: that puts the average around 23c/led
02:49 PM rue_mohr: I bought from china, 1000 leds for $6
02:49 PM rue_mohr: hmm, I think that says enought right there
02:49 PM rue_mohr: so thats 0.6c per led
02:50 PM z64555: whats the intended application
02:50 PM rue_mohr: thats 38x cheaper
02:50 PM rue_mohr: christmas lights
02:50 PM rue_mohr: ok, so lets see, 120Vac
02:50 PM rue_mohr: call it 170V peak
02:50 PM rue_mohr: over 35 leds
02:50 PM Tom_L: be sure to put a reverse diode on the string
02:51 PM rue_mohr: is about 4.86V/led
02:51 PM rue_mohr: they must have quite the resistors in those leds
02:51 PM z64555: nahh
02:51 PM rue_mohr: if they are operating at 20mA
02:51 PM rue_mohr: dropping 2.86V
02:52 PM z64555: too expensive. The resistor is probably in the plug or is the wire itself
02:52 PM rue_mohr: zippo:~/alarms# ohm -v 2.86 -i .02
02:52 PM rue_mohr: Wattage is: 0.057200
02:52 PM rue_mohr: Current is: 0.020000
02:52 PM rue_mohr: Voltage is: 2.860000
02:52 PM rue_mohr: Resistance is : 143.000000
02:52 PM rue_mohr: they would break it up to keep wattage down
02:52 PM rue_mohr: see, 57mW/ resistor
02:53 PM z64555: break what up?
02:53 PM rue_mohr: 150 ohms maybe
02:53 PM rue_mohr: the resistors
02:53 PM rue_mohr: otherwise a ballast resistor would get too hot
02:53 PM z64555: where at, then?
02:53 PM rue_mohr: series caps are an option too, bit more complex
02:54 PM z64555: if the resistors are between each LED then they'll get dim at the end of the line
02:54 PM rue_mohr: well, from the look of it, each bulb has a 150 ohm resistor in it
02:54 PM z64555: that can't be right
02:55 PM rue_mohr: oh, maybe less, these ones I get are 3.3V drop
02:55 PM rue_mohr: maybe 75R ea
02:56 PM rue_mohr: 115.3V for the drop on the leds
02:56 PM rue_mohr: 54.5V drop on the ballast resistor at 20mA
02:56 PM rue_mohr: zippo:~/alarms# ohm -i 0.02 -v 54.5
02:56 PM rue_mohr: Wattage is: 1.090000
02:56 PM rue_mohr: Current is: 0.020000
02:56 PM rue_mohr: Voltage is: 54.500000
02:56 PM rue_mohr: Resistance is : 2725.000000
02:57 PM rue_mohr: see, if you did it in one resistor it would get too hot, 1W
02:58 PM rue_mohr: if you break it up to 35 resistors
02:58 PM Tom_L: you sick today?
02:58 PM rue_mohr: zippo:~/alarms# ohm -i 0.02 -r 78
02:58 PM rue_mohr: Wattage is: 0.031200
02:58 PM rue_mohr: Current is: 0.020000
02:58 PM rue_mohr: Voltage is: 1.560000
02:58 PM rue_mohr: Resistance is : 78.000000
02:58 PM rue_mohr: its only 30mW
02:58 PM rue_mohr: yes
02:58 PM * Tom_L sprays his monitor
02:58 PM rue_mohr: its one of those ones wehre I'm ok for about 2 hours and then I'm horrible for an hour or so
02:59 PM rue_mohr: nothing like laying there dizzy with a throbbing head and a sandpaper throat
03:00 PM Tom_L: i don't do sick well
03:00 PM Tom_L: i try to avoid it
03:01 PM rue_mohr: it provides me downtime
03:01 PM rue_mohr: duty factor limit ya know
03:02 PM rue_mohr: so, if I make my strings 12V
03:02 PM rue_mohr: only about 3leds per chain
03:03 PM rue_mohr: if I make it 33V
03:03 PM rue_mohr: with a current controlled supply
03:03 PM rue_mohr: or not,
03:03 PM * rue_mohr thinks
03:03 PM rue_mohr: 2V/20mA
03:04 PM rue_mohr: yea 100mW, 2V
03:04 PM rue_mohr: 100 ohms
03:04 PM rue_mohr: er 40mW
03:04 PM rue_mohr: ok
03:04 PM rue_mohr: so, 35V
03:04 PM rue_mohr: 10 leds
03:05 PM rue_mohr: if I set a chinese dc-dc to 35V when its rated to 35V, will it probably blow up?
03:06 PM rue_mohr: they use 35V caps, so they shouldnt be set to anymore than about 17V
03:06 PM rue_mohr: huh
03:07 PM Tom_L: you won't know the absolute maximum ratings until you find them
03:08 PM rue_mohr: I think a chinese amp is about 80% of a north-american amp
03:08 PM rue_mohr: so a 10A chinese device prolly has an 8A limit
03:08 PM Tom_L: and in that same drawer is a puff of blue smoke saying "Surprise!"
03:10 PM rue_mohr: I can make my own dc-dc boost converters
03:10 PM rue_mohr: I made one for testing zeners that goes up to 200V
03:10 PM rue_mohr: it was easier than I thought
03:10 PM Tom_L: where's the one from last year's batch?
03:10 PM rue_mohr: I didn't put much thought into it either, the 55V irfZ44 didn't last long
03:11 PM rue_mohr: or the 1n5848 diode
03:11 PM rue_mohr: the which?
03:11 PM Tom_L: the supply for your string o lights
03:11 PM rue_mohr: I didn't do a light string supply
03:12 PM rue_mohr: well I converted one for some 12V lights
03:12 PM rue_mohr: but I didn't design anything for it
03:12 PM rue_mohr: my idea is to make my own christmas lights
03:13 PM rue_mohr: I should be able to avoid making my own supply if I use 8 or 9 leds in series, with a 100R resistor
03:13 PM rue_mohr: 8 would be 28V
03:13 PM rue_mohr: which is almost just a bad 24V power supply
03:14 PM rue_mohr: if I use 5 leds per substring
03:15 PM rue_mohr: *ouch my head*
03:15 PM rue_mohr: like thunder thru my BRAIN
03:15 PM rue_mohr: ok, 19.5V supply, 5 leds@3.3V
03:16 PM rue_mohr: zippo:/files/programming/c/PID# ohm -v 3 -i 0.02
03:16 PM rue_mohr: Wattage is: 0.060000
03:16 PM rue_mohr: Current is: 0.020000
03:16 PM rue_mohr: Voltage is: 3.000000
03:16 PM rue_mohr: Resistance is : 150.000000
03:16 PM rue_mohr: 60mW 150 ohms, PERFECT
03:16 PM rue_mohr: laptop adapter it is!
03:18 PM rue_mohr: a 6A adapter,
03:19 PM rue_mohr: could do 300 substrings
03:19 PM rue_mohr: ooooh wait
03:19 PM rue_mohr: I'v made this mistake before
03:19 PM Tom_L: mux
03:19 PM rue_mohr: if I do this, I might have to provide safety sunglasses to anyone going into the livingroom
03:20 PM rue_mohr: the new phosphor based leds are REALLY bright
03:23 PM Tom_L: what were the old ones?
03:24 PM * anonnumberanon fires up the drill
03:24 PM Tom_L: going back to picture tubes...
03:24 PM rue_mohr: dies
03:25 PM rue_mohr: a drop around 1.4V is a true led
03:25 PM rue_mohr: the 2-3V drop ones are a UV led, with a phosphor coating/panel/lens
03:26 PM rue_mohr: they are REALLY efficient, and easy to change colour on, casue you just use different phosphor
03:34 PM z64555: right, you can mass produce LED's of the same doping material/construction and just encase them in a different plastic
03:35 PM rue_mohr: this is the story of the creature that turned itself into a machine.
03:35 PM rue_mohr: the question is, hwo did it do it
03:36 PM rue_mohr: I should throw some leds under my steralization grade backlight one day
03:38 PM rue_mohr: maybe tonight I'll wave it over the drawrset of leds
03:38 PM rue_mohr: that has to be good for a few seconds of entertainment
03:38 PM anonnumberanon: Forgot how hard it is to take a printer apart
03:39 PM rue_mohr: a) remove all the screws you can access
03:39 PM rue_mohr: b) give it a firm bump
03:39 PM rue_mohr: c) goto (a)
03:40 PM rue_mohr: technically, c) if (isPresent('screws')) goto(a)
03:41 PM ferdna: https://imgur.com/a/7GOd8
03:41 PM ferdna: Q916
03:41 PM ferdna: fried
03:41 PM rue_mohr: OH THERE YOU GO!, replace and reassemble
03:42 PM rue_mohr: BAM! printer.
03:42 PM rue_mohr: buuut
03:42 PM ferdna: i should replace it with what?
03:42 PM rue_mohr: what if I told you the silkscreen is wrong and its really a protection diode?
03:42 PM rue_mohr: clean the top with alcohol
03:42 PM rue_mohr: does it say 1E ?
03:43 PM rue_mohr: 1G maybe?
03:43 PM rue_mohr: 2H?
03:43 PM rue_mohr: I think it says 2 something
03:44 PM rue_mohr: I can make out 1AM on the other one
03:44 PM ferdna: rue are you talking to me?
03:44 PM * rue_mohr looks around
03:44 PM ferdna: ohh yeah....
03:44 PM rue_mohr: YES
03:44 PM ferdna: fuck
03:44 PM ferdna: i cant see even i have high res pic
03:45 PM ferdna: brb
03:45 PM rue_mohr: you have to clean the stuff off
03:45 PM rue_mohr: kinda a coating of sort on the baord
03:45 PM rue_mohr: its usually lasered in, so you cant accidently scrub too hard with a swab...
03:46 PM ferdna: ohh
03:46 PM rue_mohr: ahcohol or acetone
03:46 PM rue_mohr: or nail polish remover ;)
03:46 PM rue_mohr: (she wont know)
03:47 PM rue_mohr: why dont people use larger traces when they can, look at that board, thats crazy
03:47 PM rue_mohr: a connector like that with 1 thou traces off it, thats not mechanically safe for the trace
03:47 PM rue_mohr: and there is no reason to go that small, there is nothing else going on
03:48 PM rue_mohr: it raises failure rates and makes the baord less durable
03:48 PM rue_mohr: yea, when going to a chip you need the fine traces, but KEEP IT UNDER CONTROL PEOPLE
03:49 PM rue_mohr: maybe they just say AM
03:50 PM rue_mohr: for a sot 23
03:50 PM rue_mohr: burn
03:50 PM rue_mohr: there are 3 totally different parts that use that code
03:51 PM ferdna: i just learned that they are only visible with flash
03:51 PM rue_mohr: one is a microprocessor reset circuit, one is a zener diode, one is a voltage detector
03:51 PM rue_mohr: my bets are on the diode
03:51 PM rue_mohr: MMBZ5234B
03:52 PM rue_mohr: aliexpress only has 1 hit
03:53 PM ferdna: and yes, they have 1AM and number 6 or 9 depending how you look at it
03:53 PM rue_mohr: ah
03:53 PM rue_mohr: whats smaller and or sideways?
03:53 PM rue_mohr: MMBT3904LT1
03:53 PM ferdna: https://imgur.com/a/7GOd8
03:54 PM ferdna: you can read Q906
03:54 PM rue_mohr: its just a smt 3904
03:55 PM ferdna: nice
03:55 PM rue_mohr: https://www.aliexpress.com/item/MMBT3904-SOT-23-500pcs-lot-Triode-Transistor/32311235911.html
03:55 PM rue_mohr: or grab one off another part of the other same model printer you got
03:55 PM rue_mohr: ;)
03:56 PM ferdna: printer?
03:56 PM ferdna: it is not a printer
03:56 PM rue_mohr: WTF
03:56 PM rue_mohr: you cant fix it if its not a printer!
03:57 PM rue_mohr: that would compromise the fabric of timespace itself!
03:57 PM rue_mohr: mmmmmmmmmmmmmmmmmmmmmmmm must not buy transistor....
03:57 PM * rue_mohr closes all the aliexpress tabs and rocks back and forth in his chair chanting "must not buy more stuff"
03:58 PM * rue_mohr runs his fingers thru his hair and cries, ".... but ... 100pcs,... only $1....."
03:59 PM ferdna: hehehe
04:00 PM z64555: whats this about printers not being printers?
04:04 PM rue_mohr: ferdna, is messing with timespace
04:06 PM rue_mohr: Awaiting shipment (3) Awaiting delivery (89)
04:06 PM rue_mohr: NO MORE STUFF
04:07 PM * z64555 90 deliveries later
04:07 PM rue_mohr: some of it might take canada post 7 months to handle
04:08 PM rue_mohr: hey, wtf
04:08 PM rue_mohr: it was I'm A4 but my icon still says A3
04:09 PM rue_mohr: ooh no I see
04:09 PM rue_mohr: I'm about 300 points away from A4
04:09 PM z64555: its a ploy to get you to buy more stuff
04:10 PM rue_mohr: I DONT WANT MORE STUFF
04:10 PM rue_mohr: but I doooo...
04:11 PM rue_mohr: uh, wtf, it implies I'v spent $10k on aliexpress
04:11 PM rue_mohr: that I'v bought 193 things
04:11 PM rue_mohr: over 94 days
04:11 PM rue_mohr: huh
04:11 PM rue_mohr: something is wrong there
04:12 PM rue_mohr: hmm and pints are only valid for a year
04:12 PM rue_mohr: intersting
04:12 PM rue_mohr: it dosn't matter, the points are wothless
04:14 PM rue_mohr: speaking of, I suppose I should dress up and go check the box
04:15 PM z64555: sounds like a good idea. get some exercise and a bit of fresher air.
04:15 PM z64555: ...and more time to ponder about not buying more stuff :P
04:21 PM rue_mohr: 4!
04:21 PM AchiestDragon: :) know how he feels ,, got cold , and wating for a small stream of 7 parcels to trun up atm , today the first arrived , allong with a 6" to 8" of snow
04:22 PM rue_mohr: 20pin soic adapters
04:23 PM rue_mohr: (I realized you can put more than one chip on a large adapter)
04:23 PM rue_mohr: 3x pro mini (stock, yay)
04:24 PM rue_mohr: 100pcs irfZ44 (cause china aint gonna last forever)
04:25 PM rue_mohr: and soic 28 adapters
04:27 PM anonnumberanon: First potentially usable item
04:27 PM anonnumberanon: https://imgur.com/a/HQMKy
04:28 PM rue_mohr: wonder if I blocked imugr
04:31 PM anonnumberanon: I need a phone app that one button instantly takes picture uploads it to a server and posts it in irc
04:31 PM anonnumberanon: Just one button
04:31 PM rue_mohr: yea I need a camera with a usb controllable "take pic" trigger
04:32 PM anonnumberanon: Opening printer 2, 5 times bigger
04:33 PM anonnumberanon: Take and upload and post link
04:33 PM durrf2: bluetooth shutter remote + tasker
04:33 PM AchiestDragon: just looks like it posted link without uploading it , no image
04:35 PM rue_mohr: oh good, its not just me
04:35 PM AchiestDragon: lol like the +3 views for it
04:35 PM ferdna: rue_mohr, either one right?
04:35 PM ferdna: https://www.mouser.com/Search/Refine.aspx?Keyword=SMMBT3904L
04:37 PM anonnumberanon: Omfg
04:38 PM rue_mohr: cut yourself?
04:38 PM rue_mohr: ferdna, you must be in a hurry to pay $10 shipping for a 39c transistor that you can buy 100pcs of from china for $1.50 w/free shipping
04:39 PM rue_mohr: maybe keep stock eh?
04:39 PM ferdna: :D
04:39 PM ferdna: yeah i need to take it out fast
04:39 PM rue_mohr: anonnumberanon, you wanna try the image post again?
04:39 PM ferdna: i have too much repair stuff here at home...
04:40 PM rue_mohr: oh you should have just pulled a transistor from something else
04:40 PM rue_mohr: any other 1AM
04:40 PM rue_mohr: probably have heaps of them in other things
04:41 PM anonnumberanon: https://ibb.co/mv4t7w
04:41 PM anonnumberanon: Better site!
04:42 PM rue_mohr: and not on my block list
04:42 PM rue_mohr: dc brushed motor, burn.
04:42 PM rue_mohr: ferrite, good, transistors, good
04:43 PM rue_mohr: where are the clutches? not that their prolly of much use anyhow
04:44 PM rue_mohr: anonnumberanon, send one of the 1AB smt transitors to ferdna
04:44 PM ferdna: its 1AM
04:44 PM ferdna: yes please
04:44 PM rue_mohr: he/she/it (you know you could all be bots for all I know) needs 1
04:44 PM ferdna: 2
04:44 PM ferdna: i need 2
04:44 PM rue_mohr: 2 needs 2
04:44 PM rue_mohr: :)
04:44 PM ferdna: :D
04:45 PM rue_mohr: ferdna, your not on the west side of canada are you?
04:45 PM ferdna: nope... west side of the USA
04:45 PM ferdna: well south central
04:45 PM rue_mohr: now your getting farther away
04:46 PM rue_mohr: if I mailed you one, it'd take a month to get there
04:46 PM rue_mohr: thats 29 days to get out of canada via canada post, and 1 day to get across the states
04:46 PM ferdna: i am in the border of mex and usa
04:46 PM rue_mohr: did they build a wall?, the news is unclear
04:47 PM rue_mohr: when trump got in, lots of us were thinking of building a wall
04:48 PM z64555: haven't built a wall yet, still mostly a fence
04:48 PM rue_mohr: tho, a canadian wall would prolly be 2' high and say "Please stay out."
04:48 PM AchiestDragon: if you built a wall you could charge him for it
04:48 PM z64555: canada doesn't have a whole lot of druglords running through it, last I checked
04:48 PM rue_mohr: you know, we would prolly be ok with paying for it
04:49 PM rue_mohr: we dont lord the drugs, we grow them
04:49 PM z64555: exactly
04:50 PM rue_mohr: EVERY single commercial building that was empty for a week was taken up by growers
04:50 PM rue_mohr: its stupid
04:50 PM rue_mohr: to the point your thining 'THE MARKET __MUST__ BE SATURATED BY NOW'
04:52 PM anonnumberanon: Oh wow this one has a ram stick
04:52 PM AchiestDragon: most of it has a habit of burning up soon after delivery so needs replacing
04:55 PM anonnumberanon: 2 steppers i think
04:55 PM anonnumberanon: The round ones
04:55 PM rue_mohr: 7.2 degree, thst'll do
04:56 PM AchiestDragon: mamaged to find a stronger laptop though https://www.notebookcheck.net/uploads/tx_nbc2/dell6420XFR_5.jpg
04:57 PM rue_mohr: webcams make easy postable images, but take horrid pics
04:58 PM rue_mohr: so lets see the driver board for the steppers
04:58 PM rue_mohr: what ship did they use?
04:58 PM rue_mohr: A4988?
04:58 PM rue_mohr: ULN2003?
05:01 PM rue_mohr: anonnumberanon, maybe I have to make one tonight to show you how its done?
05:01 PM rue_mohr: I'm ill tho, dont know how long it would take me
05:06 PM AchiestDragon: https://www.youtube.com/watch?v=wWvN1bi8a40
05:09 PM rue_mohr: anonnumberanon, now you post a video
05:10 PM rue_mohr: AchiestDragon, yes, but does it still work if dropped while running linux?
05:15 PM ferdna: rue_mohr, they havent built the wall yet
05:18 PM AchiestDragon: well thre mil spec watrproof drop proof etc , seems a good choice for somthing that is just going to be kicking arround
05:29 PM rue_mohr: ok, back to bed
05:29 PM Tom_L: nighty nite
05:30 PM anonnumberanon: There is a huge board
05:34 PM ferdna: rue_mohr, good night!
05:35 PM rue_bed: l
05:52 PM anonnumberanon: Lol
05:53 PM anonnumberanon: https://ibb.co/cOwjEb
05:54 PM anonnumberanon: One servo 2 steppers
06:26 PM rue_mohr: those aren't steppers
06:26 PM rue_mohr: their brushless
06:27 PM rue_mohr: DONT brake them without a power supply with overvoltage protection, or they will overvoltage themselvs
06:27 PM rue_mohr: so, hate to tell ya, still at square 0
06:28 PM rue_mohr: +- you just use the dc motor for willy nilly positioning
06:32 PM rue_mohr: the optional scanner that that printer has, has 2 steppers in it
06:34 PM rue_mohr: how did you do on the cardboard front?
07:04 PM durrf2: thats a funky screw on the shaft
07:16 PM ferdna: rue_mohr, i thought you were sleeping already!
07:16 PM ferdna: lol rue_bed
07:33 PM anonnumberanon: Lemme post the entire loot
07:34 PM anonnumberanon: https://ibb.co/fPnrub
07:36 PM anonnumberanon: Iv actually been up since 3 am im calling it quit
07:36 PM anonnumberanon: On the thinking part
07:46 PM ferdna: anonnumberanon, what are you doing?
08:28 PM anonnumberanon: ferdna i was piecing apart two printers to hopefully use some parts to play with
08:28 PM anonnumberanon: I found a screen that should not be too hard to use
08:31 PM Jak_o_Shadows: So, the L298N - what happens if I give the two inputs for the same channelthe same signal?
08:38 PM anonnumberanon: intuition says it will turn in the direction of whichever voltage is slightly higher than the other
08:40 PM anonnumberanon: are they logic level inputs ? oh yeah they must be if it's like the 74HC240 H-bridge chip
08:45 PM anonnumberanon: Jak_o_Shadows, apparently it burns something, don't do it.
08:45 PM anonnumberanon: or use a fuse, to watch it break
08:45 PM anonnumberanon: i need to start doing that
08:47 PM rue_mohr: anonnumberanon, yep, sorry, just about bupkiss for what you need
08:49 PM rue_mohr: fro this anyhow
08:49 PM rue_mohr: with the two brushless motors you can prolly make a pretty cool tank
08:49 PM Tom_shop: ok, 2 plates' hole locations drilled
08:49 PM rue_mohr: Tom_shop, hara
08:50 PM rue_mohr: anonnumberanon, we need to focus on finding you some stpper motors
08:50 PM rue_mohr: give me your zip code or whatever so I can see whats in your area
08:51 PM anonnumberanon: 07735
08:51 PM Tom_shop: next are the counterbores
08:52 PM anonnumberanon: Tom_shop, it's a gantry system or a table?
08:52 PM anonnumberanon: you have a table for x, y? fixed z?
08:52 PM anonnumberanon: by fixed i mean only goes up and down from the top of the machine but the arms that hold z don't move
08:53 PM anonnumberanon: no that's not what I meant, i will remain quiet now
08:55 PM anonnumberanon: I'm designing a 20*20*10
08:55 PM anonnumberanon: xyz
08:55 PM rue_mohr: anonnumberanon, you need to obtain and gain experience with stepper motors
08:56 PM anonnumberanon: that's easy rue_mohr
08:56 PM rue_mohr: its been a week, you failed
08:56 PM rue_mohr: :/
08:56 PM anonnumberanon: i looked it up today it's not even on a loop
08:56 PM anonnumberanon: just a few pins to turn on and off
08:56 PM rue_mohr: its not a stepper motor
08:56 PM rue_mohr: its a brushless motor
08:57 PM rue_mohr: sorry for the bad news
08:57 PM anonnumberanon: im talking about a stepper motor and how to drive it
08:57 PM anonnumberanon: i know i dont have steppers
08:57 PM rue_mohr: yes, but you dont have one and you have never done it
08:57 PM anonnumberanon: actually wait
08:57 PM rue_mohr: so, we need to get you experiance with steppers
08:57 PM rue_mohr: real ones
08:57 PM rue_mohr: tell me your zip code ...
08:58 PM rue_mohr: 905120?
08:58 PM anonnumberanon: checking one last time in my stash
08:58 PM rue_mohr: er, too many digits...
08:58 PM anonnumberanon: i put it here
08:58 PM anonnumberanon: look up
08:58 PM rue_mohr: whats your postal or zip code
08:58 PM anonnumberanon: i put it here
08:59 PM anonnumberanon: look up
08:59 PM rue_mohr: rue_mohr, hah, you dont even know what country he's in
08:59 PM anonnumberanon: 25 lines up
08:59 PM rue_mohr: hah, you dont even know if he's a he
08:59 PM rue_mohr: :/
08:59 PM rue_mohr: anonnumberanon, dont answer that
08:59 PM rue_mohr: no dont buy one from ebay
08:59 PM rue_mohr: we will get you one for free, just tell me wehre you are
09:01 PM rue_mohr: cmon, google maps finished loading a loooong time ago
09:03 PM rue_mohr: cmon cmon, my 248ms patience is getting stale
09:04 PM rue_mohr: ugh, or I'm gonna try to hack you
09:05 PM anonnumberanon: rue_mohr, it's time for you to go to bed now
09:08 PM anonnumberanon: time is money my good friend
09:09 PM anonnumberanon: hello time we meet again
09:09 PM rue_mohr: you wold rather waste money than time?
09:09 PM rue_mohr: zip code!!!!
09:09 PM rue_mohr: tell me where you are
09:09 PM anonnumberanon: 07735
09:09 PM rue_mohr: ok, gnight
09:09 PM rue_mohr: I'll find somewhere
09:10 PM anonnumberanon: yes i would because i need all the time i can use right now
09:10 PM anonnumberanon: sleep tite
09:10 PM rue_mohr: keyport looks all residentiall...
09:11 PM rue_mohr: ah idea
09:11 PM rue_mohr: a bike trail that just cuts thrut hte middle of town? WTF?!
09:12 PM anonnumberanon: it's a shithole
09:12 PM anonnumberanon: but it's comfortable
09:12 PM rue_mohr: hah
09:12 PM rue_mohr: you dont live here
09:12 PM anonnumberanon: still shit though
09:12 PM rue_mohr: look up V0N2W6
09:13 PM anonnumberanon: on google?
09:13 PM rue_mohr: maps.google.com
09:14 PM anonnumberanon: oh yeah i did yesterday
09:14 PM anonnumberanon: i was browsing your hard drive and ended up on the ad for the room for rent which has your address in it
09:15 PM anonnumberanon: not your hdd i meant your webserver,
09:15 PM rue_mohr: mhmm
09:16 PM rue_mohr: (732) 212-6100 x.2128 ask Tristan if they have any inkjet or impact printers in storage that you could have for parts
09:16 PM anonnumberanon: now that i check it out again, it's really in the middle of nowhere
09:17 PM anonnumberanon: i would hunt all the time if i lived up there
09:18 PM anonnumberanon: >responsible for the administration & maintenance of the entire technology infrastructure
09:18 PM anonnumberanon: worth a shot
09:18 PM anonnumberanon: what is an impact printer?
09:19 PM rue_mohr: great parts
09:19 PM rue_mohr: and they are specialized use, so sometimes they dont just go obsolete, but they do wear out
09:21 PM anonnumberanon: hack the gibsons
09:22 PM rue_mohr: centerville? wtf, they ran out of names or something?
09:22 PM rue_mohr: that looks about an hour away... forget that
09:24 PM anonnumberanon: i patrolled the recycling centers of Keyport, Union Beach, Hazlet, Middletown, Matawan, Red Bank
09:24 PM rue_mohr: iirc you said they were unidirectional
09:27 PM anonnumberanon: nidec rk2-0273
09:27 PM rue_mohr: ?
09:28 PM anonnumberanon: what di you say?
09:28 PM rue_mohr: e-waste only goes in
09:29 PM anonnumberanon: oh, i thought you was asking about unidirectional or bidirectional stepper motors
09:30 PM rue_mohr: 732-739-4646 say your interested in dead printers, about 20% odds, if they have anything it might be to huge
09:31 PM rue_mohr: dear god,t eh whole internet it just copied, mauled and regurgitated copies of the same data over and over
09:32 PM anonnumberanon: i might try that
09:33 PM Jak_o_Shadows: hmmm, damn, if it burns, that's the bad thing i want to avoid
09:54 PM rue_mohr: its interesting trying to find something because its giving me a reverse-image of how hard it would be to find me
10:00 PM rue_mohr: anonnumberanon, the asset you have is that you live amongst a lot of people
10:00 PM rue_mohr: and they all get rid of things that work
10:00 PM rue_mohr: for example, probably more than 1/1000 of the people around you HAVE a 3d printer, sitting on a shelf, they used once and didn't know what to do with
10:01 PM rue_mohr: odds might be higher
10:12 PM rue_mohr: https://newjersey.craigslist.org/zip/d/free-6x8-shed/6400575184.html
10:12 PM rue_mohr: hahahah, buyer has to deal with tree!
10:14 PM rue_mohr: https://newjersey.craigslist.org/zip/d/2-printers-free/6395137029.html
10:14 PM rue_mohr: ding (kinda old listing tho)
10:41 PM Tom_shop: pics to come
10:49 PM Gene_home2: Yo, any recommendations on cheap used industrial robot arms to cut my teeth on?
10:51 PM Jak_o_Shadows: hmmm. The PWM signal can still come from the pca9685, but the channel select has to come from somewhere else.
10:53 PM Jak_o_Shadows: Which sort of breaks my nice clean system of one channel is one pwm only
10:56 PM rue_bed: ?
10:56 PM rue_bed: the 9685 can only output 1 pwm channel?
10:57 PM Jak_o_Shadows: The christmas lights controller.
10:57 PM rue_bed: k
10:57 PM rue_bed: channel select?
10:57 PM Jak_o_Shadows: I am currently thinking that each channel (of lights) is one pwm input ONLY.
10:57 PM rue_bed: ... input?
10:57 PM Jak_o_Shadows: But with two sets I have, they need a h-bridge to drive them. So yeah
10:57 PM Jak_o_Shadows: input to the thing that is actually switching them.
10:59 PM rue_bed: dont know what the system looks like
10:59 PM rue_bed: i thought it was rgb addressable leds?
10:59 PM Jak_o_Shadows: I should make a diagram.
10:59 PM Jak_o_Shadows: Nah, i'm too cheap for those.
10:59 PM rue_bed: so what did you do?
10:59 PM rue_bed: H bridge? bipolar?
10:59 PM Jak_o_Shadows: STM32 -> PCA9685 -> N-channel mosfets.
11:00 PM rue_bed: ok
11:00 PM Jak_o_Shadows: Each mosfet would be one channel of lights.
11:00 PM rue_bed: yea
11:00 PM Jak_o_Shadows: Except these two sets of lights need a h-bridge
11:00 PM rue_bed: irfz44 $6/50
11:00 PM rue_bed: why an H bridge?
11:00 PM Jak_o_Shadows: they have every second LED wired backwards.
11:00 PM rue_bed: evil
11:01 PM Jak_o_Shadows: pretty much
11:01 PM rue_bed: make one power osc and use triacs
11:01 PM rue_bed: I assume a dc supply
11:01 PM Jak_o_Shadows: Yeah, DC.
11:01 PM rue_bed: if you put the power osc on a pwm channel at 50%
11:01 PM rue_bed: then more than 50% will doone side, and less will do the other
11:13 PM -!- #robotics mode set to +o by verne.freenode.net
11:16 PM Tom_itx is now known as Guest54160
11:16 PM Tom_L is now known as Guest43982
11:16 PM Jak_o_Shadows: that was odd
11:40 PM Tom_garage is now known as Tom_shop
11:44 PM Tom_shop is now known as Tom_sbc
11:44 PM Tom_sbc is now known as Tom_Shop
11:44 PM Tom_Shop: rue_mohr
11:45 PM Tom_Shop: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Y_Axis_Plate1.jpg
11:45 PM Tom_Shop: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Y_Axis_Plate2.jpg
11:46 PM Tom_Shop: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Y_Axis_Plate3.jpg
11:46 PM Tom_Shop: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Z_Axis_Plate1.jpg
11:46 PM Tom_Shop: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Z_Axis_Plate2.jpg