#garfield Logs

Oct 24 2015

00:01 zhanx Quick change of topic.
00:01 rue_house do you think a large cement filled tire would work as a steam engine flywheel?
00:01 ^kat^ no
00:01 ^kat^ maybe 500 rpm
00:01 rue_house too much?
00:01 zhanx Heck no
00:01 rue_house yea, not high rpm
00:02 rue_house oh wait, I was 3600
00:02 ^kat^ but when the rubber rots, you will have no control of which way the cement goes, or how unbalanced theflywheel gets
00:02 rue_house hmm
00:02 zhanx Wife saw an interactive coffee table wants one
00:02 rue_house put it on the project list
00:02 zhanx Kat know rue it will rot before his cements it
00:02 zhanx Rue before thanksgiving
00:03 ^kat^ i have a 6000 lbs cast iron pulley you can have
00:03 rue_house how do I test my mcs85 library, maybe I have to find a mcs85 perphial chip
00:03 rue_house I'm getting paranoid about electriciry
00:03 rue_house want to make a steam engine genorator
00:04 zhanx I need to order 2000 rgb leds and lots of shift registers
00:04 rue_house naaaa
00:04 rue_house charlieplexing
00:04 zhanx Rj11 Jacks :)
00:04 ^kat^ home network
00:04 zhanx Charlieplex, 2000 leds are you mad
00:05 rue_house you have an issue with me being mad?
00:05 zhanx Rj11 is 4 pin quick change burnout ones
00:05 zhanx Not if you make the diagram for a 2000 led charlieplex
00:06 e_house breaks out the BIG pe
00:06 zhanx Mine you they are rgb so thst 6000 wires
00:06 ^kat^ Riffraf was wanting to make a huge number of leds, i suggested a current sourse powering them all in series, and mosfet to short across leds to turn them off
00:06 zhanx Plus 2000 grounds
00:06 ^kat^ saves wattage lost in heat, actually
00:06 rue_house my calculator dosn't do functions yet, whats the ...
00:07 zhanx Kat I good idea
00:07 rue_house 1*2*3*4...
00:07 rue_house WHY THE HELL AM I ALWAYS OUT OF TERMINALS
00:07 zhanx Cause ctrl alt t
00:07 ^kat^ i foget, rue, why?
00:08 rue_house 8 line does 5040 leds?
00:08 rue_house I think this is the wrong formula
00:08 rue_house maybe not
00:08 e_house th
00:08 rue_house 3 should be 6
00:09 zhanx Shift registers will be faster
00:09 zhanx I can do spi
00:09 rue_house thats right, k ,so
00:09 rue_house its 7 lines charlieplexes to 5040 leds
00:10 zhanx Amd 9 to do what I want right
00:10 rue_house you cant shift thru 125 shift register chips
00:11 rue_house 2000 leds? how feaking big is your coffee table
00:11 rue_house thats got to be some freaking serious coffee
00:11 zhanx 1" squares
00:11 e_house thought only canadians drank that much co
00:14 at^ is still blown away by Marta Al
00:14 zhanx It will be a 48"x48" table
00:15 zhanx Yes I know that is more than 2000 leds unless my math is wrong
00:15 rue_house zippo:/files/music/mp3# calc 48*48*3
00:15 rue_house 48*48*3 -->> 6912
00:15 rue_house your led count is wrong
00:16 zhanx Well try 46*46 I need room for trim
00:17 zhanx And they are rgb leds so one led per square
00:17 zhanx Also adjust for spacing
00:17 zhanx Aka dividee
00:18 zhanx Divider even
00:18 rue_house calc 46*46*3
00:18 rue_house 46*46*3 -->> 6348
00:19 rue_house its 7 lines charlieplexes to 5040 leds
00:19 rue_house 8 lines does 40320 leds
00:21 rue_house hmm
00:21 rue_house its not reading properly, I'm just getting back the address I wrote to
00:21 zhanx Also need one ir led per and an ir receiver per square
00:21 rue_house zhanx, ..
00:22 zhanx Yea I know
00:22 rue_house what if each was independent
00:22 zhanx ?
00:23 rue_house http://ruemohr.org/~ircjunk/tutorials/elex/ledsensor/ledsensor.html
00:24 ^kat^ use an rgb, emit with one led, recieve with the others?
00:24 zhanx Will that work for leds that are 2" below 40 percent defused plexiglass?
00:24 rue_house you could pack a tiny13 into each cell that randomly did one of 3 colours
00:24 zhanx No I got am arm board for it
00:25 rue_house then you can send off to china for production
00:25 rue_house fine fine
00:25 ^kat^ http://ruemohr.org/~ircjunk/tutorials/elex/ledsensor/pics/dscn6170.jpg <<== compare the size of the dip-8 the the MDA diode block
00:26 rue_house you have good eyes
00:26 zhanx Small yes
00:27 zhanx 2 pin wide one tall about
00:27 rue_house hmm
00:27 rue_house unsigned char ReadMCS85(unsigned char address){
00:27 rue_house unsigned char result;
00:27 rue_house
00:27 rue_house // set address
00:27 rue_house BusModeOutput();
00:27 rue_house OutputByte(address);
00:27 rue_house ALEHIGH(); NOP(); ALELOW();
00:27 rue_house BusModeInput();
00:28 rue_house
00:28 rue_house // set CS low (chip select is established first cause its part of the address bus)
00:28 rue_house CSLOW();
00:28 rue_house // set read low
00:28 rue_house RDLOW();
00:28 rue_house // read data
00:28 rue_house result = InputByte();
00:28 rue_house // release bus
00:28 rue_house IDLE();
00:28 rue_house
00:28 rue_house return result;
00:28 rue_house }
00:28 rue_house maybe I have to move the cs
00:28 rue_house ok I'm tired
00:28 rue_house I'll fight this later
00:28 zhanx Get rid of the NOP () :)
00:29 rue_house you dont think it'd be too fast?
00:29 at^ drinks some anta
00:29 zhanx It would be
00:41 at^ wavers gn
14:27 rue_house 1 kid in robotics today
17:04 Tom_itx you?
19:56 rue_shop3 no
19:56 Tom_itx rue_bed go help that guy in robotics
22:26 zhanx Evening
22:26 ^kat^ YEAS!
22:28 zhanx Gee I think was drinking
22:28 zhanx Thought
22:28 ^kat^ assorted pastas, a tennis ball size of hamburger, baked beans, butter, salt and other spices, chow down
22:29 at^ listens to an unfamiliar version of the ELP Peter Gunn t
22:29 rue_house hmm
22:29 ^kat^ i'd luv to see Marta play along to this os
22:29 rue_house 1 kid today in robotics,
22:29 ^kat^ one
22:29 ^kat^ huh?
22:29 rue_house I started the new boiler reactor
22:29 Tom_itx did he learn anything?
22:30 rue_house sure
22:30 ^kat^ he learned to not be the only 1
22:30 Tom_itx what did he learn?
22:30 rue_house how a wheel is designed for a 3d printer
22:30 Tom_itx did you see the part we had printed?
22:30 ^kat^ you let him play n software?
22:30 rue_house na just gave him a rundown
22:31 rue_house we started a wheel for next week
22:31 Tom_itx http://tom-itx.no-ip.biz:81/~webpage/cnc/practice_drawings/Problem34_1.jpg
22:31 Tom_itx that was one of the assigned parts for catia
22:31 Tom_itx scaled down and printed
22:31 ^kat^ what's a catia?
22:31 rue_house er you got a 3d printer?
22:32 Tom_itx the school has quite a few
22:32 rue_house aah
22:32 Tom_itx ^kat^ catia is a cad cam program
22:32 Tom_itx $$$$
22:32 ^kat^ oh
22:32 Tom_itx similar to solidworks
22:32 Tom_itx http://tom-itx.no-ip.biz:81/~webpage/cnc/practice_drawings/problem34.jpg
22:32 zhanx Atomic?
22:32 Tom_itx i drew it up in solidworks
22:32 rue_house is it a training peice or is it for soemthing?
22:33 ^kat^ question: what if you melted all teh plastic into a solid block, and milled it?
22:33 Tom_itx probably both
22:33 Tom_itx i suppose that would work kat
22:33 Tom_itx it's printed at about 20% fill though
22:33 rue_house kat, prints have lots of air in them, so their light and ... light
22:33 rue_house dont take lots of plastic
22:34 ^kat^ and less strong
22:34 Tom_itx but good for test
22:34 Tom_itx like fit or design etc
22:34 at^
22:34 rue_house I need soemthing like a flash adc that can take my thoughts and freeze them for long enough for me to express
22:35 ^kat^ mic and recorder
22:35 rue_house I cant talk or type fast enough
22:35 rue_house esp if the local group is frowning on interrupting
22:36 rue_house if I wait for an opening, a) the topic has changed b) I dont remember what I wanted to say
22:36 Tom_itx so sit and act like you don't know what's going on
22:37 Tom_itx i felt that way at the linuxcnc fest
22:37 ^kat^ i know what i am getting for my Month Before Cakeday Celebration : http://www.ebay.com/itm/161843861024
22:37 Tom_itx A) because i couldn't hear that well
22:37 rue_house oo
22:37 ^kat^ a lifetime supply of leakproof roof for the shantyboat, free s&h
22:38 Tom_itx i find i am able to express my thoughts better on irc than vocally
22:38 rue_house the inability to interupt helps
22:38 rue_house and the backspace key
22:38 ^kat^ but Tom, you go days witht talking on irc
22:38 Tom_itx B) most anyone here i would talk to wouldn't get it anyway
22:38 ^kat^ without
22:38 ^kat^ and on *know* you are thinking
22:39 rue_house and I'm just away
22:39 rue_house I want to sleep, but I want to make progress on the power supply
22:39 rue_house these do not go togethor well
22:39 Tom_itx which will help the other happen better?
22:40 rue_house your right, if I work on the power supply I'm just gonna be better off
22:40 rue_house :)
22:40 rue_house "you cant control me, I'm a left turner!"
22:41 Tom_itx i need to make an assembly containing at least 10 parts
22:41 rue_house its a greap peice tom, do you have ideas on what to make?
22:41 rue_house er, who is going to school?
22:41 Tom_itx my kid is taking catia
22:42 rue_house ok
22:42 Tom_itx this next class is on assemblies
22:42 rue_house so your doing all the homework?
22:42 Tom_itx i'm doing it all in solidworks
22:42 Tom_itx while i help him with catia
22:42 Tom_itx so i'm somewhat learning both
22:42 rue_house am I the only one seeing a process error here?
22:42 ^kat^ no
22:43 rue_house huh
22:43 e_house looks at z passed out in the co
22:43 ^kat^ good thing it isn't the corner with the wood heater
22:43 m_itx goes to pass out as
22:44 ^kat^ tomorrow, i may slap my first paint onto shantyboat parts
22:44 ^kat^ depends on rain and things
22:44 Tom_itx rue_house, that directory ^^ has all the parts i'v done
22:44 Tom_itx so far
22:44 Tom_itx well most of them
22:44 Tom_itx http://tom-itx.no-ip.biz:81/~webpage/cnc/practice_drawings/problem32.jpg
22:44 Tom_itx was interesting
22:45 rue_house indeed
22:45 ^kat^ bbut is the kid learning anything?
22:45 rue_house cant mentally fit these togethor yet
22:45 Tom_itx he's doing his own work
22:46 Tom_itx if he gets stuck i'll help
22:46 ^kat^ k
22:46 rue_house how many of these are being printed?
22:46 e_house like
22:47 rue_house these turn into something
22:47 at^ ponders rue's kids printing out xmas pres
22:47 rue_house heh
22:48 Tom_itx so far just that one
22:48 ^kat^ print something handy, with the person's nick in it
22:49 Tom_itx http://tom-itx.no-ip.biz:81/~webpage/cnc/practice_drawings/problem5a.jpg
22:49 Tom_itx i couldn't figure out how sheet metal worked in solidworks so i drew that as a solid
22:50 Tom_itx http://tom-itx.no-ip.biz:81/~webpage/cnc/practice_drawings/problem5.jpg
23:17 ^kat^ Details about BLUE POLY TARP 30' X 40' CAMPING OUTDOORS GARAGE SHOP TARPAULIN CANVAS 13015
23:17 ^kat^ (is not canvas)
23:19 ^kat^ OUR CUSTOMERS APPRECIATE OUR ... UNIQUE BOLD PACKAGING.
23:19 ^kat^ Sizes listed are cut size. Tarpaulins are 6-10" smaller due to seams and hems.
23:20 ^kat^ that's like buying 1/2 plexi on ebay, they al say it's 1/4 , but none of it is
23:20 ^kat^ er
23:20 ^kat^ that's like buying 1/4 plexi on ebay, they al say it's 1/4 , but none of it is
23:27 rue_shop3 hmm
23:28 rue_shop3 so I wonder, for the current limiting on the power supply, if I should make the overcurrent disable the pwm drivers or if I should do it at the analog state and have it gradually roll back the drive signal
23:29 rue_shop3 I suppose I never found a good foldback circuit
23:29 ^kat^ if it's fast enough for you, i figure telling the voltage sense the voltage is too high shouldlower the current tillt he current is whatever you want
23:30 ^kat^ i think it was the 723, was a good foldback
23:30 rue_shop3 yea, they also use a transistor to jam the output lower
23:33 ^kat^ well, good thing about tricking the Vsense on the switcher: it makes ess voltage, less power, it doesn't overheat making 14v and then throwing away 13.5v at 10amps in heat when driving a short circuit
23:34 rue_shop3 I got a pwm converter designed and mostly tested
23:34 ^kat^ ok, trick it then
23:34 rue_shop3 because Its not easy to run the P channel fets from 0-100%
23:34 rue_shop3 I split it into two phases
23:34 ^kat^ a 20Mhz avr may be fast enough to make it a smart foldbacker
23:34 ^kat^ which p-chan fet dija use?
23:34 rue_shop3 0-50% and use a capacitor for coupling which drops the extra votlage between the driver and the P channel fet
23:35 rue_shop3 IRF4905
23:35 rue_shop3 really nice low Ron
23:35 ^kat^ yeas, i got the LM723 datasheet, it has limiting or foldback
23:35 rue_shop3 I'm going for 250Khz, I think its happening
23:36 ^kat^ that's awefull high
23:36 rue_shop3 right now I have a pile of schematics
23:36 ^kat^ i have the 4905 sheet too
23:36 rue_shop3 partly why I'm wondering if I can have a current limit comparitor just disable the converters pwm
23:36 rue_shop3 easy logic op
23:37 ^kat^ see: FDS6375
23:38 rue_shop3 nice and small
23:38 rue_shop3 but my bulk is 32V
23:39 ^kat^ o
23:39 rue_shop3 its been a repeated challange
23:39 rue_shop3 I'v made a bunch of systems that "just have to go togethor"
23:40 rue_shop3 an analog regulator that does votlage and current limiting*
23:40 at^
23:40 rue_shop3 a 2 phase 250Khz, pwm genorator
23:41 rue_shop3 a P channel fet driver
23:41 ^kat^ i stil use a 5amp 14v laptop charger to charge the overhead winches, and the diesel truck batteries
23:41 e_shop3
23:42 rue_shop3 I need this bench supply
23:42 rue_shop3 and I have a high side current sensor that I'v made and tested
23:42 ^kat^ i sorta want to put two 5amp 15v in a box to make 10amps@14v
23:43 rue_shop3 and somewhere I have a DAC circuit
23:46 ^kat^ i pondered making a dac with 300v 30Mhz RF transistors
23:46 ^kat^ appling 100v
23:46 ^kat^ 16 of them, making a 90vac signal directly, apply to the output transistors
23:47 ^kat^ no analog gain stage
23:47 ^kat^ volume adjusted by simply lowering the psu voltage to the dac
23:47 rue_shop3 I want to break this into modules, but I'm not sure where
23:48 e_shop3
23:50 ^kat^ [make voltage] [ V-sense and feedback] [ I-sense and feedback]
23:51 ^kat^ i say toss an avr into it, so if the bits get hot doing normal current limiting, change to foldback
23:57 rue_shop3 I'm thinking [dac board] [I/V regulator] [power driver]
23:57 rue_shop3 then I can swap regulators or power drivers
23:57 rue_shop3 pwm/analog driver etc.
23:57 ^kat^ ok
23:58 rue_shop3 The sense components could be on the dac or reguator board
23:58 rue_shop3 cause thats not gonna change
23:58 rue_shop3 hmm
23:59 rue_shop3 maybe thats better on its own board, but it dosn't warrant much
23:59 rue_shop3 hmm stacked boards?