#robotics Logs

Aug 19 2013

00:56 rue_house I think
00:56 rue_house I think thye buffed it for the picture
01:05 RifRaf i think it looks like a transparent breadboard
01:43 rue_house yea, a buffed one
09:11 rue_house RifRaf, does the first time recharge of a li-ion battery take longer than latter rechargings?
09:22 robotustra if it degrades with the time - yes. but it shouldn't be much difference
09:22 robotustra usually when it's discharged totally it has 2.51 V
09:23 robotustra but it's recomended not to discharge lower than 3.1 V
09:23 rue_house I was just looking at a chart that seemed to shoe the first recharge taking longer than subsiquent
09:23 rue_house ah, I went to 3
09:24 rue_house took a looooong time to get back to 4.1
09:24 robotustra depends on charging current and capacity
09:24 rue_house 1.3Ah
09:24 robotustra what current?
09:24 rue_house not sure what the chrager uses..
09:25 hackman127 rue_house!
09:25 robotustra do you use LiPO charger?
09:25 rue_house its an adjustable charger from an interweb schematic
09:25 robotustra it shouldn't be 4.1 V
09:26 robotustra good charged battary is 3.78V
09:26 hackman127 rue_house: Did you get your dyndns updated?
09:26 rue_house fixed
09:27 hackman127 Ok, just wanted to make sure you got my email.
09:27 rue_house the charger was adjusted to charge to top top voltage
09:27 rue_house thanks, I still want to send you something, eventually hardware has to be changed on these things :)
09:28 hackman127 The server appreciates it. :-)
09:29 rue_house robotustra, http://eds.dyndns.org/~ircjunk/circuits/lionchg3.pdf
09:29 rue_house thats the charger I built
09:30 rue_house I'd be set for 985ma
09:32 hackman127 Would that work for packs larger than 3 cells?
09:32 rue_house hmm I suppose thats a votlage regulated constant current charger...
09:32 rue_house I suspect the circuit could be adjusted
09:32 rue_house no blaancer tho, so
09:33 robotustra yeah, it's simple
09:33 robotustra what are you using your batteries for?
09:33 rue_house I have to check the 12V pack I been charging with it sometime
09:33 rue_house robotustra, I have one small robot that uses cell phone batteries, I have a large hexapod that dosn't yet
09:33 rue_house and I'm building an electric truck
09:33 rue_house so I have cells around to maintain
09:34 rue_house have to find good truck batteries
09:34 rue_house you saw my chart on the ebay cells
09:35 rue_house http://eds.dyndns.org/~ircjunk/images/li-ion.png
09:35 robotustra http://www.ebay.com/sch/i.html?_trksid=p2050601.m570.l1313&_nkw=Mac+book+pro+battery&_sacat=0&_from=R40
09:35 rue_house http://www.ebay.ca/itm/370812730210
09:36 robotustra they are refurbished?
09:36 rue_house it dosn't look like a pack like that is right when I'm trying to build a 24kWh pack
09:36 rue_house they are new
09:37 rue_house but as you can see from the chart, the 4.9Ah is a lie, they are 1.3
09:37 robotustra ha ha
09:37 rue_house they still might be the best price
09:37 rue_house I'm re-comparing
09:37 robotustra chineise are famous liers
09:37 robotustra liars
09:38 rue_house I dont care they lie, I thought they did
09:38 rue_house I took a cell apart
09:38 rue_house they are raw cells, no protection of any kind
09:38 rue_house which is cool for me
09:38 robotustra why?
09:39 robotustra what protection are you going to use?
09:39 rue_house I need to make a 90V - 600V pack, if one cell tries to open a little protection circuit I'm sure the whole thing would burst into flame
09:40 robotustra he he
09:40 robotustra http://www.ic-fortune.com/upload/Download/DW01-P_DataSheet_V10.pdf
09:41 robotustra are you going to do electric mobile?
09:41 robotustra did you recieved this battery from ebay?
09:42 robotustra I thought post canada does not ship lipos
09:42 rue_house I bought 4 or 5 of those from ebay to test them
09:42 robotustra and what is your conclusion?
09:42 rue_house they didn't mark them as lithium, and you cant have unprotected cels in NA :)
09:42 rue_house fine price for 1.3Ah li-ion batteries
09:43 robotustra ok
09:44 robotustra what about this one http://www.ebay.com/itm/New-9-Cell-Laptop-Battery-for-Apple-MacBook-Pro-15-A1150-A1175-MA348G-A-Silver-/350855104449?pt=Laptop_Batteries&hash=item51b09807c1
09:44 rue_house but I have (plaing with two designs) 20A or 100A discharge rates, so I need high Ah batteries so I dont have to parallel tooo many
09:44 rue_house hobby batteries can run about 5C discharge
09:45 robotustra for RC planes can discharge up to 22 C
09:45 rue_house yes, those are the really expensive batteries
09:45 rue_house work, bbl
09:45 robotustra ok
12:04 domoorigamirobot any robots in here?
12:04 domoorigamirobot i have a question about some probabilistic stuff
12:04 GuShH domoorigamirobot: boop
12:04 theBear i can think like a robot
12:04 theBear i can talk like a robot
12:05 theBear i can dance and quack like a robot
12:05 eBear is probably a r
12:05 GuShH robots don't quack!
12:05 chris_99 haha
12:05 domoorigamirobot reverse turing test
12:05 domoorigamirobot !
12:05 theBear i talk robotinese ! quack quack !
12:05 GuShH here we run the bear-ing test
12:05 GuShH and if you fail we throw bearings at you.
12:05 domoorigamirobot OWCH
12:06 domoorigamirobot ok i have a Q : characterizing two robot positions as gaussians on space, i want to define a region of their colliding above some threshold
12:06 domoorigamirobot is there an algorithm to learn this region?
12:06 domoorigamirobot svm? perceptrons, lol?
12:06 GuShH you could learn a lot from game development
12:07 GuShH it's all the same, but optimized for speed and none of the academic nonsense.
12:07 theBear as guassians ? you overthinking it man
12:07 domoorigamirobot umm . no .. a game is a deterministic environment .. i know where an object is in a game .. in physical space .. you need to probabilistically model things like position and sensor return
12:08 domoorigamirobot kinda standard right? read thrun?
12:08 theBear fine, don't take our advice
12:08 GuShH you've been retarded.
12:08 GuShH you know where two robots of your creation are as well, if you want to. they are robots, they can communicate with each other.
12:08 GuShH if you are imposing to yourself a limitation of "no, they can't communicate" you have other issues.
12:09 domoorigamirobot they can communicate their interpretation of things to each other
12:09 domoorigamirobot the point of probabilistic modelling is to capture the uncertainty
12:09 GuShH this guy.
12:09 theBear and if you using statistics to estimate where yer at, you're doing it wrong
12:09 domoorigamirobot i'm not in control systems .. i'm in software verification
12:09 GuShH you are a theoretical fool.
12:09 domoorigamirobot yup
12:10 theBear GuShH, heh, that's nice of yer, adding theoretical so as not to hurt his feelings :) i think it's pretty much confirmed
12:10 GuShH go back to your academia.
12:10 GuShH theBear: No, I'm sick of words. That's all.
12:11 domoorigamirobot haha .. brilliant group of people.
12:11 theBear heh, you shoulda just skipped the big one in that sentence then
12:11 domoorigamirobot ok thanks folks
12:11 GuShH Software verification these days could mean he's a fat kid beta-testing for the playstation platform.
12:11 theBear walk into somewhere telling people they don't know what they're talking about, you ain't gonna get any favours
12:11 GuShH You could get stabbed in some places!
12:12 theBear nah, i think it's more like automation is too expensive, so they pay dumb kids to do bounds testing and shit via manual input:)
12:12 GuShH it's data-entry but on a lower level
12:12 theBear hehe yeah basically
12:13 GuShH I has two robotz they each know where they are in spaze but I want to guess where they are instead!
12:13 ShH eats whole bu
12:13 theBear hey, he said probabilistic not guess <biggrin>
12:13 GuShH That reminds me, cheddar these days is mostly plastic and grease right?
12:13 theBear aww damn you, now i gotta go eat some butter
12:14 theBear most of it, you can still get real cheddar tho
12:14 GuShH he was throwing around random words.
12:14 GuShH this stuff I had yesterday with "nachos" was not real AT ALL
12:14 theBear ALMOST random... what is that saying, err... little bit of knowledge is dangerous ? :)
12:14 GuShH well it existed for a brief moment, but it wasn't the genuine stuff.
12:15 GuShH I think it must've been the sample I got for some new type of herbs booze they come up with
12:15 GuShH chick was too enthusiastic and I couldn't say no!
12:15 GuShH (she was clearly on the drunk side too)
12:15 GuShH that stuff was potent. you could thrive on it
12:16 theBear lol
12:16 GuShH it's funny, they won't sell you booze past 21hs but you can get samples...
12:16 theBear no shit ? and really, 9pm ? that's messed up !
12:16 GuShH it is!
12:17 GuShH hopefully we voted the right people to change that
12:17 GuShH at least THAT.
12:17 theBear i heard it's worse in norway if that helps
12:17 GuShH it was nice, we put a shoe up the grubmint's ass last month
12:17 theBear heh, way to turn the tables
12:17 GuShH yeah maybe it was me voting...
12:18 ShH could've voted twice had he smeared up some burnt up cork on his face... with the foun
12:18 theBear lol, every one counts
12:18 GuShH get some watermelon and boom, double vote.
12:18 GuShH aww too stereotypically racist
12:19 theBear hehe, i still giggled, i'm a bad boy
12:19 GuShH two more years of nonsense until we get to vote for a new president though
12:19 GuShH unless someone decides to ahem.
12:20 theBear viva la revolution !
12:20 GuShH has someone fitted a gun into a "point and shoot" camera before?
12:20 GuShH that would be great.
12:20 GuShH just a firing mechanism and a basic barrel
12:20 theBear i saw it in a movie, from memory the gun goes wherever you shine a laser pointer
12:20 GuShH o.o
12:20 theBear and it'll do it from blocks away
12:20 GuShH oh there's a gun expo / convention thingy going on here
12:21 GuShH still got 3 days left to go...
12:21 theBear woohoo, that must be fun
12:21 GuShH I don't know if they're shooting 'em but yeah lots of guns.
12:21 theBear mmm, i woulda made fun italic, but i can't
12:22 GuShH wat
12:22 theBear you know, like "fun"
12:22 GuShH sideways fun
12:23 GuShH wait, Italic would be skewed fun.
12:23 GuShH maybe skew is what happens when you drink too much... so Italic typography means they're all drunk?
12:24 theBear it means i can think of many things i'd do before hang around the kinda people that go to a gun convention
12:24 theBear and i'm a redneck in a redneck state :)
12:24 GuShH oh they're different here
12:24 GuShH it's not like the US
12:24 GuShH people in the US owns guns just-because
12:24 theBear can't be that different
12:25 GuShH they are!
12:25 theBear i wasn't thinking about people that own guns, they're generally ok here
12:25 GuShH the amount of stupidity from US gun owners is huge, they're borderline preppers.
12:25 GuShH but here they're mostly country side people and the rest like to shoot for sport
12:25 GuShH hunters, etc.
12:26 GuShH you know, there are lots of hot chicks with guns too.
12:26 ShH hints the
12:26 theBear that err, doesn't sound wise
12:27 GuShH Oh they're not their guns, they're just paid to look pretty with guns.
12:27 theBear oh, now i get you
12:27 GuShH Most of them can't even hold them properly.
12:27 theBear i got tired of trophy girls like that as a kid, they're as depressing as strippers... then again, i don't mind strippers or topless waitresses if you know they comin' home with you after
12:28 GuShH Haha
12:28 GuShH And you know what you're getting!
12:28 GuShH So... are you related to RifRaf? you two look similar!
12:28 theBear lol, twice in a day, hehe
12:28 theBear nah, we just both enjoy moving electronics and drinking
12:29 GuShH damn wine kills me... I shouldn't drink that stuff.
12:29 GuShH I'm all sleepy!
12:29 theBear ssshhhh, i only had one beer and i wokeup too late for the shops today
12:30 GuShH must be like a kid in a candy store when theBear hits the booze shop
12:30 GuShH happy music, slow motion
12:31 theBear totally ! for a while one chain even had carpenters playing constantly, why do birds, suddenly appear
12:33 GuShH lol
12:36 theBear the ads were awesome, dude in a giant foam costume like a sports mascot jumping out in front of real people in the stores and singin it at them real loud
12:42 dagano you guys play with legos all day?
12:43 theBear yeah, you play with your sexdoll all day ?
12:43 dagano yup
12:43 theBear aiight, i think we're done here.... gnight then
12:43 dagano I WANT MORE
12:44 theBear you don't deserve it, and i'm sleepy
12:44 dagano NO FOR REAL
12:44 dagano what is your experience with robotics?
12:45 dagano ugh
12:45 dagano legos
13:01 aep so i want to get started on programing a robot arm, without knowing much about mechanical engineering. anyone has some hints where i should start?
13:06 SquirrelCZECH aep: google! :D
13:06 SquirrelCZECH but I think it's still ok to suggest begginner arduino
13:06 SquirrelCZECH and there are tons of materials about arduino and arm...
13:06 aep yeah i know the electronics part
13:06 SquirrelCZECH so only mechanics?
13:06 aep right
13:06 aep i dont know anything about it
13:07 SquirrelCZECH use fantasy, logic, make little "tests"
13:07 SquirrelCZECH inspire yourself by internet :-)
13:07 aep uh, i wouldnt even know which materials to buy
13:07 uirrelCZECH just knows it because he is used t
13:07 SquirrelCZECH aep: it depends on usage
13:07 SquirrelCZECH and how strong is your electronics
13:07 SquirrelCZECH like I said, best way is maybe to copy something ;-)
13:07 aep for learning experience i want to built a robot arm with 2 axis that lifts 1kg
13:07 aep yeah
13:08 aep tried searching for a few hours, but all i find is either really expensive (> $500) or requires alot of knowledge about mechanics
13:09 SquirrelCZECH I would expect that 1kg would be expensive on electronic part :D
13:09 aep hmm. you think the servos would be?
13:09 SquirrelCZECH yes
13:09 SquirrelCZECH also it would ne proper power source....
13:09 SquirrelCZECH aep: this looks really nice
13:09 SquirrelCZECH http://www.waitingforfriday.com/index.php/Building_a_robot_arm
13:09 aep huh this is cool
13:10 aep thanks. reading
13:10 SquirrelCZECH yep
13:10 SquirrelCZECH it also depens a lot on what tools you have
13:11 SquirrelCZECH aep: I personally would go with this one....
13:11 aep right, just seen it requires something to cut metal
13:11 SquirrelCZECH yep :D
13:11 aep i can easily buy some tools.
13:11 SquirrelCZECH iron saw! :-)
13:12 aep right. sounds like something you find in every local store
13:14 aep hmm the one thing i apparantly need to learn is torque
13:14 aep right, one of the servos he uses is Eur40, and it needs 5
13:14 aep not that cheap :D
13:17 SquirrelCZECH :D
13:22 GuShH iron saw?
13:23 GuShH all you need is an angle grinder and a pair of balls.
13:25 GuShH I don't see the point in building one of those, let alone copying it off someone
13:25 GuShH arduinians...
13:28 aep what would you do instead?
13:57 SquirrelCZECH GuShH: ehm, I prefer to learn beginners the "hard work" (iron saw)
14:00 SquirrelCZECH and it is also cheap :-)
14:04 aep angle grinder actually sounds not precice enough
14:04 aep not like i know. just a feeling
14:19 SquirrelCZECH it's precise enough
14:19 SquirrelCZECH if you are strong and used to it
14:37 -pratchett.freenode.net:#robotics- [freenode-info] please register your nickname...don't forget to auto-identify! http://freenode.net/faq.shtml#nicksetup
21:29 GuShH RifRaf: got the cheapie drill press, came with a "free" vise... 350W pretty cool, haven't assembled it yet
21:29 GuShH I see place for improvement in some parts, but it's not as bad as I thought it would be.
21:29 GuShH alu pulleys etc
21:34 RifRaf cool, get some holes drilled before you try and rebuild it
23:36 GuShH RifRaf: woah!
23:37 GuShH that'll be hard, since the first hole I tried the drill snapped (I've never broken a single drill bit in my life... until now)
23:37 GuShH found a setscrew near the quill, will readjust and see if there's still wobbling
23:37 GuShH otherwise, back to the store for a refund
23:37 GuShH yes I had punched the metal before trying to drill
23:37 GuShH no I won't use a center drill, what's the point of a drill press then
23:38 GuShH bit was 3mm brand new
23:38 GuShH brb