#robotics Logs

Oct 22 2013

07:29 Tom_itx gongoputch, i can get one for you if you want
10:19 katsmeow-afk 7200 PCS IDT 74FCT244P ; 1 Bid: $29.99 ; Time left:10h 22m
10:20 GargantuaSauce wtf are you doing with all these ridiculous loads of logic ICs
10:20 DagoRed GargantuaSauce: Don't ask. She's a wizard.
10:20 GargantuaSauce i mean i have maybe 600 in total and am going to have trouble utilizing them all
10:21 katsmeow-afk i never said i was buying or selling them, i merely let you know someone is
10:21 GargantuaSauce well ok those particular ones aside i am well aware you have other truckloads of them :V
10:21 GargantuaSauce and am actually curious as to their application!
10:22 katsmeow-afk <_< -_- >_>
10:23 katsmeow-afk there have been times that a reel of chips came up that i needed 20 of, and the cost to buy 20 was the same as to buy the reel, so i got the reel
10:23 GargantuaSauce yeah ok i am familiar with that situation
10:25 katsmeow-afk there's been the case where i needed 100 of a part, and the cost to get 1000 was the same, and the cost to get 5000 from china (in 2 months) was the same as to get 5000 in the usa (next week)
10:25 katsmeow-afk i once watched a part drop in price for a year, because it was mislabled, i got a reel for $20
10:27 katsmeow-afk the otehr day, i picked out 12 32kx8 eproms for 1 cent, no way could i buy a single eprom for 1/12 cent
10:29 katsmeow-afk i want to make a video switcher, need 24 db15hd connectors, for $18 i got 1000 of them, need any? they work fine for other signals too, not just vga
10:30 GargantuaSauce heh
10:30 GargantuaSauce you probably have all sorts of stuff i'd be willing to take off your hands
10:30 katsmeow-afk how much did you pay for the last 74ABT16245's you bought?
10:30 GargantuaSauce i don't bother with non-cmos ones
10:31 katsmeow-afk how much did you pay for the last 74FCT16374's you bought?
10:32 GargantuaSauce wait abt is bicmos durr
10:32 GargantuaSauce and the answer to all of the above is way too much
10:32 GargantuaSauce i realize when i buy from mouser i'm paying for convenience
10:33 GargantuaSauce and ridiculous packaging :D
10:33 katsmeow-afk fast cmos dual 374 latches, but broadside pinouts like the '574 , i paid 1.1 cent per chip
10:34 katsmeow-afk in case i wanna plugin DVI instead of VGA, 170 DVI for $3
10:36 GargantuaSauce when i finish my 100% through hole OISC if i still feel like building retarded computers and switching to smd i'll definitely hit you up
10:36 katsmeow-afk was it you building the HV generator? qty 33 capacitors, 3300ufd 350v : $3
10:36 GargantuaSauce i plan on building one at some point, yes
10:37 katsmeow-afk 11kv isn't a lot, but with 3300u caps, that's a lot of current to feed a tesla with
10:37 GargantuaSauce those must be pretty big!
10:37 katsmeow-afk ~5x2.2 inches
10:37 GargantuaSauce heh
10:39 katsmeow-afk fond memories with whimhurst and vad degraff's
10:39 katsmeow-afk van
10:39 GargantuaSauce i am thinking TEA laser
10:40 katsmeow-afk why?
10:40 GargantuaSauce why not
10:40 GargantuaSauce that's the question behind most of my projects
10:41 GargantuaSauce could do all sorts of stupid crap with a uv laser
10:41 katsmeow-afk i eman if you are going with atmosphereic pressure, go all the way to pumped gas
10:41 GargantuaSauce oh, well that'd be a place to start
10:41 GargantuaSauce the same ps could be reused
10:41 katsmeow-afk starter project, yeas
10:42 GargantuaSauce seems like it'd be a good idea to start with the sole danger being hv (and uv) before moving on to a potential shrapnel generator
10:42 katsmeow-afk i'd like to have free use of enough laser to buttweld #14 steel wire
10:43 GargantuaSauce oh yeah a nice CO2 one would be great too
10:43 katsmeow-afk recirc-gas copper-vapor , and the ps for it
10:44 GargantuaSauce couple kW of green...yes please
10:44 katsmeow-afk heh
10:45 katsmeow-afk i have a 6000 lb flywheel i was going to rig as a power supply, prolly going to junk it soon
10:45 katsmeow-afk i know it weigs 3 tons, because i had 2 of them and weighed one when i sold it
10:47 katsmeow-afk ok, bbl
14:12 pythonsnake please I need some relations between biology/science of life and earth and robotics
14:12 pythonsnake i though maybe biologic IA vs artificial IA
14:13 pythonsnake any other stuff?
14:30 ed_ launches Xaid's Sleena. One of the best arcade games ev
15:40 SquirrelCZECH pythonsnake: AI
15:42 pythonsnake yes
16:50 katsmeow-afk well, roboticists are often trying to copy biologics
16:50 katsmeow-afk including any flaws, strangely
16:51 katsmeow-afk an AI will never get along with humans, humans are too illogical, temperamental, and the AI has no way to drink beer or beat someone to a pulp for cheering at the wrong team
16:54 Shiven Can anyone recommend any fundamental literature on servos? I think i get the basis of the idea but it seems the entire internet has copy&pasted the same article over and over giving no real... spread
16:55 katsmeow-afk well, they are basically 3 phase motors that you do not drive at a constant ac, and they tend to have (but may not have) magnets in their rotors
16:57 Shiven i understand that; i understand the basis of pwm as well though i'm struggling with actually getting it to move correctly, so i thought i'd try and do some reading
16:57 katsmeow-afk if you took a wound rotor 3phase 3600rpm generator, put dc to the rotor, and drove the windings like you do a stepper motor, you'd have a huge stepper motor
16:57 katsmeow-afk oh,, the N pole on the rotor will line up with the winding you have power going thru to make a S pole on the stator
16:58 Shiven its a digital servo
16:58 katsmeow-afk to make the rotor move a lil, you make the next pole over S too, and turn off the first S pole
16:58 katsmeow-afk o
16:58 Shiven i was under the impression windings only existed in steppers lol
16:58 tsmeow-afk is not going to guess and wait on det
16:59 katsmeow-afk servos have motors, they have windings, unless you find a fancy piezo or hydraulic one
16:59 GargantuaSauce he's talking about hobby servos
16:59 GargantuaSauce you just give them a pulse every 20ms
16:59 GargantuaSauce between 1 and 2 ms long
17:00 Shiven do you continue to pulse even if the servo is at the right point though?
17:00 GargantuaSauce yes
17:00 Shiven like sub 1ms say
17:00 Shiven so it doesn't move
17:00 GargantuaSauce no no, the pulse length controls position
17:00 Shiven oooooh
17:00 Shiven lightbulb moment
17:00 Shiven lol
17:00 GargantuaSauce hooray
17:00 katsmeow-afk 50-50 centers the position
17:01 GargantuaSauce ya 1.5ms for the centre...some of them can take more range than 1-2ms but start with that
17:01 Shiven okay so just to spell this out fully
17:01 katsmeow-afk see, all you had to do was tell GargantuaSauce exactly what you have
17:02 Shiven it probably doesn't help that i don't understand fully waht i'm asking either lol
17:03 GargantuaSauce ya when it comes to figuring this stuff out, knowing the question to ask means you're 90% there
17:03 tsmeow-afk found a 100amp 72vdc motor that might make a good 30degree stepper, if the rotor is replaced with a single fixed
17:04 GargantuaSauce i have to run but i'd be happy to help you in detail in a couple of hours
17:04 Shiven so just so i don't blow the damn thing up trying, each different pulse variation (of a certain step size) will pulse x degrees
17:04 Shiven Thanks for the help Gargantua, i'm starting to get there :)
17:04 katsmeow-afk well, pulse to a position is not quite it, it should turn smoothly to the new position
17:05 GargantuaSauce the pulse length sets the target angle of the servo's internal control system
17:05 katsmeow-afk but yeas, the whole point of the different pulse width is you can program it down to a degree or less, and go back to that position over and over with the same pulse width
17:06 Shiven sweet! okay time to fiddle :D
17:06 katsmeow-afk how fast it turns is dependant on the load, the servo's rate of correction, and how fast you can change the pulse width
17:08 Shiven its a crappy $2 digital servo i found online, so i'm not expecting to use it in anything significant, this is just test fodder (;
19:39 hackman127 I'm looking for a hardware audio DSP that I can control through i2c or some other simple means. Any ideas?
19:51 katsmeow-afk wow, hackman hasn't spoken in here in years!
19:51 tsmeow-afk was just admiring a sprocket with no teeth on one side : http://tinyurl.com/q7sasje
19:52 Tom_itx something stopped and something else didn't
19:53 hackman127 katsmeow-afk: HA! Hasn't been quite years, but yeah, I disappear a lot. :-)
19:53 katsmeow-afk your brother has also (Jeremy)
19:54 hackman127 I'm amazed you remember that. It probably has been years since he's been here.
19:54 katsmeow-afk :-)
19:55 katsmeow-afk anyhow, about DSP, no, i don't,, i have some analog i2c ,,or twi? chips
19:55 orlok wouldent i2c be to oslow for dsp?
19:55 tsmeow-afk is looking for the smallest sproket to fit a 1/5 inch s
19:55 katsmeow-afk err, 1/2
19:56 katsmeow-afk 0.5
19:56 hackman127 orlok: I'm not looking to send audio data through i2c, just looking to send commands to the DSP through a simple comm buss. I'd like to use the DSP for something like a graphic EQ.
19:57 orlok Hmm.. Dunno, the people i know that have fiddled with them they have always been reasonably integrated into the prototyping platform
19:57 orlok like the beagleboard, or whatever DSP unit my brother was fiddlign with
19:59 hackman127 What I'm looking to do is make an android powered car stereo that I can hook to the car's ALDL connector so I can do realtime diagnostics and monitoring. The prototyping board I have has an audio controller, but I'm not sure if I can do a software audio processing.
19:59 hackman127 https://www.olimex.com/wiki/A20-OLinuXino-MICRO
20:00 orlok Ahh. What engine?
20:00 hackman127 GM 2.8. Going into an '86 Fiero.
20:00 hackman127 One of my many obsessions... lol
20:00 orlok And you dont want to go ODBCII>?
20:01 orlok factory engine?
20:01 orlok (fieros are very rare here)
20:01 hackman127 The car doesn't support ODBII, unless I swap in a more modern engine. Which will happen, one of these days, but not for quite a while. And I figure once I have the platform down, all I have to do is change some code to plug into ODB2 rather than ALDL.
20:02 hackman127 Yep. I have 3, actually, all 2.8s. One is pretty heavily modified, the other 2 are bone stock.
20:02 orlok I had to google to find out of it was a 4 or 6 heh
20:03 hackman127 Considering how rare they are is Oz, I'm surprised you knew the car. lol
20:04 orlok yeah, but - cheap rear engine GM coupe!
20:04 hackman127 The only American mid-engine. Gotta love it.
20:04 orlok i wish Subaru would make something like that
20:04 hackman127 You've probably got Subaru coming out your ears, don't you?
20:05 orlok Except for.. Corsair?
20:05 hackman127 Corvair was technically a rear engine where the Fiero is a mid.
20:05 orlok Yeah. Moreso because my brother in law owns a subaru wreckers, and both our daily drivers are subies
20:05 orlok '97 outback and '91 brumby
20:07 orlok I generally think more just in terms of "engine in front of or behind the driver"
20:07 orlok rather than specifics of where it is related to the axles
20:11 orlok hackman127: I kinda wish my subia had some sort of engine management. Its one of the last of the carby models
20:11 orlok 4sp manual, not even a tacho.
20:12 hackman127 lol! Yeah, they were pretty simplistic. Air cooled, which is what doomed them.
20:12 orlok Nah, thats the old Vw and Porsche engines
20:13 orlok Otherwise i'm very worried about where i put the 5 litres of coolant last weekend
20:13 orlok but still pushrod, single throat carby, but does have electric dizzy
20:16 hackman127 OH! I was getting confused. I missed a line or two, I was talking about the corvair being air cooled. lol
20:16 orlok oh haha
20:17 orlok Only annoyance with the subies.. the "new" one, '97, 5 door, auto, has tacho. The open door indicator only tells you that a door is open, not which one.
20:17 orlok the "old" one, '91 2 door utility, manual. No tacho, but it will tell you exactly which door is open.
20:18 hackman127 That's pretty funny.
20:18 hackman127 Honestly, though, how often do you watch the tach when shifting?
20:19 orlok Never had a manual with a tacho!
20:20 orlok but yeah, i can tell when to down/upshift.
20:20 orlok a vac. guage would probably be beter
20:25 hackman127 You're right about that. I have a vac gauge and a tach in my '86 Fiero SE, but all Fieros come standard with a tach.
21:14 MrCurious today rocked
21:47 hackman127 Hooray for today rocking
21:48 theBear mmm tacho is good... i'm also fond of burritos and chimichangas !
21:49 hackman127 pollo quesadilla
21:50 orlok pollos hermanos
21:50 orlok donde esta la pollo
21:50 orlok me no hablo espanol
21:52 katsmeow-afk gatos les gusta el pollo
21:53 MrCurious and now delivery pizza. can it get ANY better
21:53 katsmeow-afk s�, la pizza de pollo!
21:53 GargantuaSauce livin it up
21:55 katsmeow-afk so what's the downside to useing a brigs&straton starter motor to make the wheeled roboplatform move?
21:56 GargantuaSauce if it'll happily run with a high duty cycle
21:56 MrCurious speed
21:56 MrCurious hope you gear it ddown some
21:56 GargantuaSauce and you can supply its probably-ridiculous current draw
21:56 orlok starters are generally designed for short burts
21:56 MrCurious i suspect it will also take a huge current draw
21:56 katsmeow-afk i was thinking 10:1 geardown
21:56 orlok so may overhead with extended use
21:57 tsmeow-afk looks at orlok's overheard with short b
21:57 MrCurious over heat, may over heat your lipo''s and cause fire!
21:57 MrCurious perhaps a different motor would be a better choice?
21:57 katsmeow-afk lead acid, torque, low rpm
21:58 MrCurious SLA gets broken if you over discharge
21:58 MrCurious and its heavy
21:58 katsmeow-afk people use those cordless impact wrench motors on battle bots, and those things eat 20amps
21:58 orlok i have been thinking about bringing my bot back to life, i guess i have a few years before i have to cannabilise it for the Batmobile
21:58 MrCurious and have a big voltage discharge curve IMHO
21:59 MrCurious wheel chair motors
21:59 katsmeow-afk but they are cheap and the weight helps bite the ground
21:59 MrCurious but please obtain those motors ethically... no push over and snag and run
22:00 katsmeow-afk i been collecting them a $1 at a time, i have a box of them
22:01 MrCurious pizza coma!
22:01 orlok Can somebody have a poke at a website for me? Will only take 30 seconds. I got an error the first time i used it, then could not reproduce.
22:01 orlok http://www.crypt.net.au/?q=ctools_ajax_sample - click on a wizard, type a name, click a thing.
22:01 MrCurious loads here
22:02 orlok Yeah, now go through one of the little Ajax demo thingies
22:02 MrCurious long ago closed
22:02 katsmeow-afk Animal
22:02 katsmeow-afk Choose animal � Configure lizard
22:02 katsmeow-afk Name your lizard *
22:02 Faek I have a Domesticated Hawk called Faek
22:02 GargantuaSauce 500
22:02 Faek Isnt it supposed to be a Hawk Raptor
22:03 katsmeow-afk Animal
22:03 katsmeow-afk You have a non-venomous lizard named "Plow".
22:03 orlok Faek: No, but i did add some customisation to you have an option of a Raptor type called Jurassic, and the text for that is Jurassic Raptor rather tan just Jurassic
22:04 Faek Ok
22:04 orlok Yeah, probably could have gone into lizard, but.. meh
22:05 orlok Just sucky seeing intermittent errors
22:13 orlok GargantuaSauce: 500?
22:14 GargantuaSauce response code
22:14 GargantuaSauce to the final request
22:14 GargantuaSauce got it repeatedly
22:16 orlok Ahh. Can you replicate?
22:16 orlok and you use Eastlink?
22:16 orlok yes
22:16 orlok thats you i see in the logs
22:16 orlok :
22:16 GargantuaSauce ya 173.252.19.214
22:18 GargantuaSauce default modal, sheep, wenslydale named fsjldghjasafdfja did it
22:19 GargantuaSauce your javascript needs to not capture keypresses by default because it is really fucking annoying for ctrl-w to not work
22:19 katsmeow-afk but not fsjldghjasafdfjb ?
22:21 orlok You have a Wensleydale sheep named "fsjldghjasafdfja".
22:22 orlok Ok, got it again. I switched into private browsing to get it
23:49 katsmeow-afk There are currently two Intel Xeon Phi Coprocessor in the 3100 family, with the primary difference being that one is actively cooled with a built-in fan and the other is passively cooled. Both are PCI Express add-in boards and offer >1 teraflop peak double precision performance and offer 28.5MB cache and 6GB GDDR5 memory capable of 5GT/s and 240GB/s bandwidth.
23:49 katsmeow-afk Like the 3100 coprocessors, the passively-cooled 5110p is a PCIe add-in card, It offers 1,011 gigaflops per second performance with 60 max cores clocked at 1.053GHz. The coprocessor has 30MB of cache and is pared to 8GB of GDDR5 memory running at 5GT/s and offers 320GB/s bandwidth. Board power is 225W.
23:50 katsmeow-afk The exact pricing for the 3100 coprocessors is still undisclosed, but they will reportedly be under $2,000; the 5100p, on the other hand, will run $2,649.
23:50 katsmeow-afk time to smarten up those robots!
23:50 katsmeow-afk Speaking of NVIDIA, the company also announced its latest HPC offerings today with the K20 and K20X GPUs, which sport some similar specifications to the Intel Xeon Phi coprocessors. Obviously, Intel is approaching supercomputing from the CPU side while NVIDIA is tackling things with its GPUs