#robotics | Logs for 2016-08-23

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[00:05:04] <rue_house> I wonder if I can do the feedback calcs BETWEEN the data channel transfers
[00:05:49] <rue_house> I just asumed I'd go all asynchonous on it
[00:06:24] <rue_house> the output data is 12 bits, I still might have to
[01:39:56] <z64555> I'm... going to have to do some major reading up on the chip's build environment
[01:40:01] * z64555 sighs
[01:40:19] <z64555> this is why things such as eclipse are so popular
[02:51:04] <z64555> oh, I just remembered about a paintball gun idea I had years ago
[02:51:49] <z64555> It was a dual-barrel design that could adjust convergance
[02:52:46] <deshipu> don't cross the streams
[02:53:04] <z64555> yeah, that's basically what it did
[02:53:30] <z64555> the barrel angle would adjust according to a laser beam mounted between the two barrels
[02:54:34] <z64555> would've had two photosensors on each barrel, one inside, one outside. The light level seen by each beam determined if a servo should change the angle in or not
[02:55:02] <z64555> silly idea, though, since you don't need convergance on a small-arm if you just put the barrels right next to each other
[03:01:46] <Casper> just raise the pressure so you do not need to compensate!
[03:03:08] <z64555> you basically have a garden hose at that point. aaaannd can't hit anything much further than a few feet from you
[03:07:06] <deshipu> make paintball grendaes from cans of paint and fireworks
[03:07:30] <deshipu> one guy got a lid embedded in his forehead, but that's a flesh wound
[03:10:59] <z64555> lol. yeah no
[03:12:53] <z64555> Hm? What did they have in mind? Have the paint can perforated, a baloon or similar water-proof membrane to seal the holes, and the firecracker(s) inside of another baloon ?
[03:14:11] <z64555> or maybe have it a bit simpler, have balloons/bladders full of paint, situated around the firecrackers?
[03:14:19] <z64555> yeah, that would work
[03:15:08] <z64555> sadly I have no use for it around here
[07:08:19] <oaulakh> does anyone have idea to make a robot that can mimic human hand writing? like bond do?
[07:08:53] <deshipu> you can just use a printer
[07:09:12] <oaulakh> hahahaha, u r awesome one u know
[07:09:45] <deshipu> http://www.ablogtowatch.com/jaquet-droz-the-writer-automata-awesome-antique-android/
[07:10:07] <oaulakh> i mean to say robot who can learn to use pen instead my printer cartridge
[07:11:17] <deshipu> oaulakh: like this? http://hackaday.com/2014/02/13/a-clock-that-plots-time/
[07:13:27] <deshipu> apparently you need 3 small servos, arduino and some 3d-printed parts
[07:13:36] <deshipu> and a sharpie
[07:14:56] <oaulakh> ok
[07:15:25] <oaulakh> deshipu, this will do work once i get to use pen with robot later i will get how to make it more like human writing
[07:16:49] <deshipu> or you could do this http://hackaday.com/2011/04/13/knex-whiteboard-plotter/
[07:18:13] <oaulakh> deshipu, problem is not to make robot but to get code working which would follow handwriting fonts !!!
[07:18:13] <oaulakh> deshipu, any experience?
[07:18:43] <deshipu> what's the problem? you just record the movements and play them back?
[07:22:59] <oaulakh> deshipu, my main problem is how to plot machine which would mimic human fonts?
[07:22:59] <oaulakh> machine code
[07:31:39] <EglesonQ> code
[07:32:52] <EglesonQ> The code is in your brain, the machine is the medium.
[09:26:53] <rue_house> interesting things to say when the brain is the medium of the code that is the mind
[09:30:07] <deshipu> nonsense, brain has no code
[09:30:15] <deshipu> it's an association machine
[09:32:50] <mrdata> it's all about the code
[10:09:45] <SpeedEvil> There is code.
[10:09:54] <SpeedEvil> It is just obfuscated
[10:10:05] <SpeedEvil> And very badly commented
[10:11:39] <deshipu> no, it doesn't work that way
[17:47:52] * z64555 digs for diodes
[17:48:44] * theBear mines for mosfets
[17:50:29] * theBear shuffles for scrs and foxtrots for ferrous powdered products
[17:58:36] * anonnumberanon reads http://www.cs.indiana.edu/~geobrown/book.pdf hoping it will be mostly applicable to stm32f407/429
[18:00:49] <z64555> I hope nobody does the hokey pokey for high powere
[18:00:52] <z64555> *power
[18:02:12] <anonnumberanon> can you explain your geek joke?
[18:16:53] <z64555> I blame theBear
[18:17:10] <samy^> anyone know where to find small flywheels? looking for something like ~10-15cm diameter
[18:17:42] <SpeedEvil> samy^: for what?
[18:18:04] <samy^> SpeedEvil: i'd like to play around with building a simpler version of the Cubli
[18:18:06] <SpeedEvil> samy^: to what rpm
[18:18:42] <samy^> SpeedEvil: not sure, would love to see what's available
[18:19:00] <z64555> I found some 1N diodes... I think they're a bit overkill
[18:19:20] <samy^> SpeedEvil: potentially up to 20k rpm
[18:21:23] <SpeedEvil> http://www.ebay.co.uk/itm/FOR-NISSAN-MICRA-K11-1-0-1-3-1-4-1993-2002-FRONT-2-NEW-BRAKE-DISCS-AND-PADS-SET-/280077157253?fits=Car+Make%3ANissan|Model%3AMicra&hash=item4135e64385:m:mC3WhGXtOJ68FfIc8EOFvpA
[18:21:26] <SpeedEvil> slightly larger
[18:22:39] <samy^> ahh
[18:25:50] <SpeedEvil> Also depends on if you're willing to slice a circle out of a disk
[18:33:23] <z64555> hm. What's the convention for bending diodes. Cathode sticking up, or Anode?
[18:34:07] <z64555> I'm thinking cathod
[18:35:10] <samy^> SpeedEvil: sure, i'm open to anything -- i'd prefer less work over more of course, but if i need to put in some elbowgrease i will
[18:39:28] <SpeedEvil> Fixing a plate onto a motor securely, drawing a circle on it, hacksawing off the stuff outside the circle, and then using it with a file to finish off can work just fine
[18:45:18] <samy^> cool
[18:48:49] <samy^> i was seeing that someone else who made a simple version of the cubli used the ESCON 36/3 servo controller, yet it's $300+ USD...seems crazy expensive, ideas why it would be so much?
[18:48:51] <samy^> http://www.maxonmotorusa.com/medias/sys_master/8813629833246/414533-ESCON-36-3-EC-Hardware-Reference-En.pdf
[18:55:21] <samy^> the current of 2.7A continuous/9A max maybe?
[19:00:13] <z64555> or the fact that it's R/C stuff
[19:02:08] <SpeedEvil> maxon is insanely expensive
[19:02:47] <SpeedEvil> It's what you buy if you need a motor, and need it to work for years without issue, with good datasheets and ...
[19:08:20] <samy^> ahh
[19:08:46] <samy^> so i should just look for a similar device with similar specs
[19:29:10] <anonnumberanon> rue_house, how do you paste code snippets line by line into a channel? I want that power too, now.
[19:29:18] <anonnumberanon> pls
[19:29:53] <SpeedEvil> samy^: what rpm and power motor are you looking for
[19:32:24] <samy^> SpeedEvil: no load 6800rpm, 50W
[19:34:48] * z64555 tries to not maim himself
[19:34:58] <z64555> anonnumberanon: just use pastebin
[19:35:03] <samy^> i don't have the motor yet, looking at 50W brushless EC-45-flat (maxon, but may look at something else)
[19:36:12] <SpeedEvil> I suspect you don't
[19:36:27] <SpeedEvil> that is ~0 torque - which is needed for a thing like that
[19:38:28] <SpeedEvil> http://www.hobbyking.com/hobbyking/store/__67016__Quanum_MT_Series_2227_800KV_Brushless_Multirotor_Motor_Built_by_DYS.html - for example - this will do 6000RPM @ around 80W
[19:39:31] <SpeedEvil> http://www.hobbyking.com/hobbyking/store/__67027__Quanum_MT_Series_4012_340KV_Brushless_Multirotor_Motor_Built_by_DYS.html @300W
[19:47:25] <samy^> ahh nice
[19:47:27] <samy^> thanks!
[19:50:26] <samy^> suggestions on something to read to understand what it is i would need in the first place? like, to know whether it's torque, and how much i would need? i'd like to be a bit educated on the area...i'm guessing it has to do with the weight of the flywheel + weight of the entire device i'm trying to roll
[20:02:54] <SpeedEvil> https://en.wikipedia.org/wiki/Reaction_wheel
[20:03:21] <SpeedEvil> https://en.wikipedia.org/wiki/Control_moment_gyroscope
[20:03:27] <SpeedEvil> the two have very different requirements
[20:08:23] <z64555> man, I gotta get a crimping tool for these dupont connectors.
[20:09:38] <samy^> SpeedEvil: thanks!
[20:29:44] <z64555> mkay, new 5V wire soldered on. now to swap the genders of the signal wires so they'll plug into the new board
[21:06:11] <z64555> blah. just two more connectors to solder on
[21:09:28] <anonnumberanon> what are u werkin on z64555
[21:10:47] <z64555> servo connector board.
[21:11:05] <z64555> connects the 4 ESC's to the controller
[21:11:21] <z64555> I put 4 diodes on it so I can pull power from all the BEC's
[21:29:17] <anonnumberanon> lol
[21:29:41] <anonnumberanon> im passed out gtg
[21:38:16] <z64555> getting a steady 4.7V from the BEC's
[21:38:32] <orlock> battery eliminator circuit?
[21:40:47] <z64555> yup
[21:41:36] <Casper> does anyone know which program can be used to simulate mechanical propriety? I plan to do some welding project, but the photo I saw... I have some doubts on the strength...
[21:42:25] <Tom_itx> solidworks
[21:42:27] <Tom_itx> catia
[21:42:40] <Tom_itx> both will do analysis
[21:43:06] <Tom_itx> or any other good cad package worth it's salt
[21:43:10] <Casper> which one is the easiest to use?
[21:43:32] <Tom_itx> they're both similar
[21:43:42] <Tom_itx> but sw is probably more obtainable for you
[21:43:54] <Tom_itx> i've got both
[21:43:58] <Tom_itx> student ver of catia
[21:44:15] <Tom_itx> real one runs ~75k
[21:44:24] <Tom_itx> where SW is much less
[21:45:09] <Tom_itx> both have a decent learning curve
[21:45:46] <Tom_itx> both can use real material data
[21:46:07] <Tom_itx> i haven't done analysis with either
[21:46:15] <Tom_itx> but i know they will
[21:47:04] <Tom_itx> what photo?
[21:47:23] <Casper> http://www.wcwelding.com/images/plant-stand-and-pirates-chest-21614835.jpg
[21:47:24] <rue_shop4> hmm I need to put togethor an atmega8 board
[21:48:07] <Tom_itx> what are you worried about?
[21:48:43] <Casper> that the pot would make the support bend
[21:48:52] <Tom_itx> it'll be fine
[21:49:09] <Tom_itx> all the support is hidden in the geometric shapes
[21:49:11] <Casper> with 1/8x3/4?
[21:49:23] <Tom_itx> unless you fill em with lead or tungsten
[21:49:25] <Casper> I also need to figure out how to bend...
[21:49:26] <Tom_itx> or gold
[21:49:34] <Tom_itx> ask rue
[21:49:39] <Tom_itx> he bends crap
[21:49:44] <Tom_itx> make a jig with pins
[21:49:53] <Tom_itx> and roundy thingies
[21:50:06] <Tom_itx> pretty simple really
[21:50:16] <Casper> I was thinking to use some pipe fitting, metal of course, hot roll on it
[21:51:06] * Casper pushes ferdna out of the door
[21:51:10] <Casper> *MINE!*
[21:51:47] * Tom_itx puts Casper in the corner until he learns how to share
[21:52:18] * Casper breaks the corner into pieces, give a piece to everyone
[22:02:47] <ferdna> =|
[22:21:32] * z64555 wonder's what he'll do with only a piece of a corner
[22:22:39] <Casper> it's a collectible item! you just gotta catchem all!
[23:58:05] <rue_shop4> I think I rolled on a spider last night
[23:58:22] <rue_shop4> I'v got a bug bite on my ass that still itches 12 HOURS later