#robotics Logs

Oct 26 2014

00:32 rue_shop2 hmm I'm low on 8Mhz crystals, should I sit down and strip 50 circuit boards of every crystal on them or order a bag of 200 from aliexpress
00:49 rue_shop2 yay I made a shiney new microcontroller board
00:54 rue_house booo, as well as missing the reset pullup, they have the 5 and 12V backwards
01:02 orlock yay i found a chunky 3.3v regulator on an old/early model PCI ADS card
01:03 orlock EZ1085CM 3.3
01:24 lock is gone (05:05PM): (automatically dead -
09:49 Veverak can somebody tell my
09:49 Veverak why is it bad to have two steppers on one driver?
09:49 Veverak (paralel)
11:16 Tom_shop what if they don't step the same?
11:18 LoRez I've seen 3d printers that have two z steppers use the same driver for both.
11:18 deshipu why would you need two motors doing the same thing?
11:18 Tom_shop deshipu like on a long gantry
11:23 Veverak deshipu: like this archive
11:26 Veverak *like this http://reprap.org/mediawiki/images/archive/c/c2/20140206115006!Visuel_Prusa_i3_Rework.png
13:05 Vetaxili Hi all. I wondered, is there another way of dealing with uncertainty in robots other than probabilistic theories?
13:05 ace4016 what do you mean exactly?
13:06 ace4016 you mean in their behavior? control?
13:06 ace4016 what they'll face and how they'll handle it?
13:11 Vetaxili I am working on the simulation of an agent that is faced with some uncertainty in the world. it is supposed to move in a random way, and on the 'return to base' command, its supposed calculate its position and make its way back. I am following "Probabilistic Robotics" books by Sebastian Thrun....
13:12 Vetaxili To be more precise I have to write a literature review for my final year project. As I've never done it before I thought that a good starting point would be seeing if there is another method of robots dealing with the noise they experience.
13:13 ace4016 robust or probablistic techniques are pretty much all we have
13:15 Vetaxili Ah, I see. Thank you. :-)
13:16 ace4016 i mean, when you're dealing with uncertainty, you only have a probability of what is to come :P
13:16 ace4016 now, return to base type stuff seems more like INS type stuff
13:18 Vetaxili What does INS stand for?
13:23 ace4016 inertial navigation system
13:24 ace4016 basically, the system keeps track of where it's been to try to keep itself oriented (all internal readings from things like accelerameters and gyros and such)
13:24 ace4016 i did something similar with my robot for senior design
13:24 ace4016 tracked where it should have been
13:24 rue_house Insert
13:24 ace4016 but that's a pretty heavy probability thing as well
13:26 rue_house If my line follower is uncertian its got a good lock on the line, it slows down
13:27 rue_house ok, so many people want me to do so many things today...
13:27 ace4016 like what?
13:28 Vetaxili ace4016 It sounds a little like path integration. One of my aims is to actually compare my final simulation to path integration in ants. And before that, I am going to try and implement the algorithm within Lego EV3. It all is pretty new to me so I wonder how I do in each of these tasks. :P
13:29 rue_house one guy want to see some led strips
13:29 rue_house one person is building a person scanner and would like me to check out their setup
13:30 rue_house someone else...
13:30 rue_house hmm
13:30 rue_house maybe only the last 2 stay in memory
13:37 rue_house oh yea, I was supposed to do the recycling yesterday
13:38 mrdata oh well
13:39 mrdata we have our recycling pickup each 2 weeks
13:39 mrdata do you now have to let it sit around and pile up?
14:05 rue_house I have to take it in between 1pm and 3pm on saturday
14:05 rue_house its the only time my availablity overlaps them being open
14:06 rue_house our politicians are big time oil families, they aren't into recycling/ environmental.
14:07 rue_house as a result, anyone in the recycling thing is usually struggling
14:09 rue_house so for a 5A, 30V power supply
14:10 rue_house if I'm using a linear regulator
14:10 rue_house peak possable power output would be...
14:11 rue_house 0.1V on the load at 5A means basically 150W across the regulator
14:11 rue_house the 2n3055 is rated for 115W
14:13 Tom_itx rue_house's fifo buffer is getting smaller
14:13 rue_house intereting, the IRF1404 is rated 333W
14:14 Tom_itx that's the 40A one isn't it?
14:14 rue_house 202*
14:14 rue_house * hypothetical, package limit applies
14:15 rue_house Calculated continuous current based on maximum allowable
14:15 rue_house junction temperature. Package limitation current is 75A.
14:15 rue_house and I'm pretty sure that I seen 100A fuses with thicker elements than the lead of a TO-220
14:16 rue_house waaay thicker
14:17 rue_house I suppose if you cut off the middle lead (use the tab) and solder it flat against a large piece of copper you might get close
14:17 rue_house breakfast
14:17 rue_house hmmm
14:18 rue_house all these robot arms sitting around doing nothing while I have to go make myself breakfast
14:20 rue_house huh, I'd figure a big old to-3 would be better for heat dissipation than a t0-220
14:21 rue_house I'm gonna end up temporarily using fets in linear mode and they are gonna hate me
14:31 Tom_itx more aluminum surface to disapate heat
14:31 Tom_itx unpopular now because of their size
14:32 rue_house nono, the 220 is better
14:32 rue_house to-3 is 115, the to-220 is 333
14:32 Tom_itx you think?
14:32 rue_house datasheets
14:33 Tom_itx i wouldn't have figured that
14:33 rue_house its prolly cause of better thermal die bonding?
14:33 Tom_itx maybe
14:34 rue_house hmm
14:34 rue_house 2sc5584 is a HOT, I wonder how it stacks up
14:36 rue_house hmm, its only 150W
14:38 rue_house ok I sfinished breadkfast, now I need to have lunch
14:47 Tom_itx make your bots fix it for you
20:59 fckng_stupid i finally found the data sheets for the dual core 6502 cpu chip circa 1984 : http://www.datasheetarchive.com/dl/Scans-055/DSAIH000103824.pdf
21:08 rue_shop2 neato
21:09 rue_shop2 I suppose you cant count program cycles on it, you dont know if you been held up by the bus & resouces
21:21 orlock had to get new boots today
21:21 orlock left them out to air last night
21:21 orlock had a suprise thunderstorm overnight
21:24 rue_shop2 oops
21:24 ace4016 lol
21:25 ace4016 that sucks
21:31 rue_shop2 oh look a list!
21:31 rue_shop2 -arm
21:31 rue_shop2 -reprap
21:31 rue_shop2 cool, I'm on task, I'm working on the arm
21:33 orlock rue: EZ1085CM 3.3 should do for all my 3.3v power needs?
21:33 orlock i only need 400Ma or so
21:39 mrdata mega what?
21:39 mrdata or do you mean mA
21:39 rue_house AAAAAAAAAAAAAAAAAAAAA I LIED TO ME!! I TOLD ME THAT I HAD ENOUGH RICE FOR THE WEEK!!!! NOW I'LL HAVE TO EAT LIKE HUMAN OR SOMETHING!!! YES YES, I NEED THE NEIGHBOURS PHONE NUMBER, HAVE TO INVITE THEM OVER, WHERE IS IT... WAIT, I HAVE ENOUGH RICE FOR TONIGHT.. ARG, I CANT EAT THEM FOR SUPPER TOMMOROW, I'M OUT OF SEASONING.... WAIT WAIT ITS TOMMOROW i CAN STOP BY THE STORE AFTER WORK AND GET MORE SEASONING... yea.... yea, that'll work, i
21:39 rue_house can pick it up on my way home.... see! I'm good, catastrophy averted!
21:40 mrdata dont forget the neighbours
21:40 rue_house http://www.ivanepling.com/?portfolio=apple-iie-iphone <-- preorders anyone?
21:40 orlock hah yes mA sorry
21:40 rue_house 400mA is a bit
21:40 rue_house whts the source voltage
21:41 rue_house why not use one of thoese adjustable modules from china
21:41 orlock i have a EZ1085CM on a board to be desolvered
21:41 orlock desoldered
21:43 orlock EZ1085CM is a 3A regulator apparently!
21:44 rue_shop2 oh what is it?
21:44 orlock http://pdf1.alldatasheet.com/datasheet-pdf/view/42417/SEMTECH/EZ1085CM.html
21:44 orlock i have one on an old PCI ADSL card
21:45 rue_shop2 its linear
21:45 rue_shop2 whats your source votlage
21:45 rue_shop2 whats your source votlage
21:45 rue_shop2 whats your source votlage
21:45 rue_shop2 whats your source votlage
21:45 rue_shop2 whats your source votlage
21:45 orlock Plugpack, so probably anywhere from 6v to 10v
21:45 orlock depending on what i can find
21:45 rue_shop2 the max is 7V
21:45 orlock ok
21:45 rue_shop2 "input supply voltage, 7V max"
21:46 rue_shop2 whats your source voltage?
21:46 rue_shop2 whats your source voltage?
21:46 rue_shop2 whats your source voltage?
21:46 rue_shop2 whats your source voltage?
21:46 rue_shop2 whats your source voltage?
21:46 orlock 7v then
21:46 orlock unsure if i still have a 6v plugpack
21:46 rue_shop2 its not verry efficeint
21:46 rue_shop2 6V plugpack puts out 10ish volts
21:47 rue_shop2 use a switchmode 5V plugpack
21:47 orlock ok
21:47 rue_shop2 its a 1V dropout, there is more than enough headroom from 5V
21:47 orlock also - lm317's - how is output voltage determined? per chip or adjustable?
21:48 orlock theres one in a nightlight for the bub, looks like most of the LED's in it got cooked
21:48 rue_shop2 two resistors
21:49 orlock hmm - no resistors on it that i could see \
21:49 orlock only about 12 LED's, and LM317
21:49 rue_shop2 hey, all the max scientists use little round goggles for saftey goggles, do they stay on ones' head better when not in use?
21:49 rue_shop2 the 317 is prolly in current mode
21:49 rue_shop2 you can use it as a current regulator
21:50 rue_shop2 but if you make it drop tooo much voltage at too much current, it'll burn up
21:51 orlock this looked like it was driving the led's arranged into a few banks
21:51 orlock if that makes sense
21:52 rue_shop2 huh, they are a lot more comfortable
21:53 rue_shop2 orlock, 120 in?
21:53 rue_shop2 they dont squeeze your head so bad
21:53 rue_shop2 maybe I'll make some lexan lenses for them
21:54 orlock mains is 240 here - but the nightlight has a 7v (i think) plugpack
21:55 orlock hmmm
21:55 orlock i was wiring up a circuit while really drunk last night
21:56 orlock but i retained enough common sense to not power it up
21:56 orlock i am going to try and use a level convertor
21:56 orlock never had to before
21:59 rue_shop2 well, measure the dang thing
21:59 rue_shop2 whats it output, I'm guessing about 11
21:59 rue_shop2 unloaded
22:00 Tom_itx huh
22:01 Tom_itx rue_shop2
22:01 Tom_itx don't turn supper on and go back to the shop
22:02 Tom_itx dude was laser cutting some parts went in the other room to make some edits came back to his house on fire
22:05 rue_shop2 too late
22:05 rue_shop2 yea, I think cnc machines will generally try to do that when left unattended
22:05 rue_shop2 I have an extinguisher soemwhere
22:05 Tom_itx may be good to dust it off
22:07 rue_shop2 I do its things every year, iM a fire equip inspector ya know
22:07 rue_shop2 ooops, i lost my bracket
22:08 rue_shop2 wow am i smart, i bolted it to the robot
22:10 orlock rue_shop2: so you stamp the tags and stuff on fire sprayer things?
22:14 rue_shop2 yep
22:14 rue_shop2 and panels and sprinkler piping
22:15 rue_shop2 on a goood day I even sleep my name right
22:32 rue_shop2 hhahahahaha! the cable drive works!
22:32 rue_shop2 I think
22:35 Tom_itx you were ready to chuck it last i heard
22:36 rue_shop2 yup, it works
22:36 rue_shop2 using glass beads as a tube didn't work
22:36 rue_shop2 so I'm using apolstry bead
22:36 Tom_itx oh
22:36 rue_shop2 works great
22:36 rue_shop2 and the latches for the cable I made are working great
22:36 rue_shop2 they allow for adjustment
22:36 Tom_itx no pics?
22:54 rue_house I havn't uploaded till I knew what was gonna work
22:56 Tom_itx heh good plan i guess
22:57 rue_house tho im thinking of a had fail entry
22:57 rue_house geez im a sloppy eater
23:06 rue_house hmm boiler delta 5c will hold even with a radiator delta 11c
23:08 rue_house ill dump all the images tonight
23:21 rue_house ok, I'm full
23:22 rue_house I have 45 mins left till I self destruct
23:22 rue_house which means restarting the boiler isn't gonna be an option
23:31 rue_shop2 i was wrong
23:31 rue_shop2 wasn't a 100% restart, but I got the bed broken up again
23:32 rue_shop2 so its good for 3 days more or so
23:38 rue_shop2 sweeeet, arm 9 is basically done
23:38 rue_shop2 just the cosmetic and junk
23:43 rue_house oh and kitty litter
23:43 rue_house geeez
23:55 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060841.jpg <-- fial
23:56 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060842.jpg
23:56 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060843.jpg
23:56 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060844.jpg
23:56 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060845.jpg -- still failing
23:56 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060847.jpg <-- working
23:56 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060848.jpg
23:56 rue_house yeeha
23:57 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060849.jpg <-- do it like a bike!
23:57 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060850.jpg <-- first method, lots of work, hard to adjust
23:57 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060851.jpg <-- both on, working
23:58 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060852.jpg <-- mid method, better, still laborious
23:58 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060853.jpg
23:58 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060855.jpg <-- idea for stretching the springs!
23:59 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060856.jpg <-- a few spacers required
23:59 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060858.jpg working pretty well
23:59 rue_house http://ruemohr.org/~ircjunk/robots/arm9/p1060859.jpg <-- arm 'done'