#robotics Logs

Sep 21 2015

01:44 veverak I see
01:44 veverak deshipu: btw: have you ever thought
01:44 veverak about making 4 leg robot based on raspb A ?
01:44 verak maybe finally got money for
01:45 Snert MobilPi
01:52 deshipu veverak: I have a rpi A+ waiting for its turn to control Tote
01:53 deshipu veverak: I just don't have the time recently
01:54 deshipu the season of the conferences approaches, and I have to prepare my talks and workshops
01:54 deshipu veverak: by the way, are you coming to pycon.cz?
01:56 orlock hmm
01:56 orlock deshipu: you in .cz?
01:56 SomePotato Guys, I made a bad..
01:56 SomePotato I forgot to buy wheels for my robot :P
01:57 SomePotato Is there any way of making DIY wheels using common household things?
01:57 orlock SomePotato: Sure, depends on what sort of a house you have and what the requirements are..
01:57 orlock CD's have been used
01:58 SomePotato Something that fits on a small motor and works on a tiled surface
01:59 deshipu orlock: no, .ch
02:00 deshipu SomePotato: jar or bottle caps with rubber bands from condoms or long baloons on them
02:03 SomePotato Do regular rubber bands work?
02:03 orlock if they fit without lumps, sure why not?
02:04 SomePotato Hm, there is that
02:04 SomePotato Oh btw, anything I can buy from Tesco as well counts
02:05 SomePotato I will /eventually/ replace the DIY wheels but I just wanna see it go :P
02:05 orlock got lots of hot glue?
02:06 orlock cable ties? gaffa?
02:08 SomePotato I do have access to all but cable ties
02:09 SomePotato Thanks iPad
02:09 SomePotato I've been thinking about bottle caps, it's just the rubber to make it have any friction is the hard part
02:10 deshipu SomePotato: well, tesco does have some toy cars...
02:11 orlock i'd get mine from salvos
02:11 SomePotato Mine's rather small
02:11 deshipu ah, I remember tescos from Poland, where there are huge
02:11 deshipu anyways, cork may work too
02:12 deshipu especially if you get a cork mat and cut them out
02:12 SomePotato So the message I'm getting is experiment until you find something that works
02:12 SomePotato thanks guys for your help :)
02:12 orlock hmm you in the uk?
02:12 SomePotato Yeah
02:14 SomePotato (Realises he should really go to work)
02:17 veverak deshipu: not yet
02:17 veverak :)
02:19 veverak deshipu: but maybe I will :)
02:21 veverak deshipu: thanks for noticing!
02:21 veverak or, notifying ?
02:22 deshipu veverak: the call for papers is still open!
02:22 veverak well
02:22 verak is not sure what he should write paper a
02:22 veverak :)
02:23 deshipu well, s/papers/talks
02:27 deshipu veverak: well, 3d printing?
02:28 veverak deshipu: what to say that was not allready said?
02:28 veverak :)
02:28 Jak_o_Shadows You could easily get a paper out of FEA modelling of FDM printing
02:28 Jak_o_Shadows easily
02:29 veverak lol
02:29 veverak it's just that I cna't think of something that I "know" and was not allready "said" several times...
02:29 deshipu veverak: it's the first pycon.cz, there will be a lot of people who haven't seen all those other talks
02:29 veverak but nah, I've got time to decide I suppose :)
02:30 deshipu veverak: there is a large value in repeating stuff and making it easier to access
02:30 orlock veverak: Random question - Dont suppose you know Leigh?
02:30 veverak true to that
02:31 veverak orlock: nick? nope
02:31 orlock dgtlmoon
02:31 veverak ???
02:31 verak doesn't fo
02:31 orlock it his nick
02:31 veverak nope
02:31 veverak you from cz?
02:31 orlock Ok, it was unlikely, just thought i'd ask
02:32 orlock no - au
02:32 orlock as is he
02:32 orlock but he lives in prague now
02:33 deshipu orlock: that's not that far, Vienna is practically next to Brno ;)
02:33 veverak orlock: far, far, from prague I am now :D
02:34 orlock deshipu: yeah, i've lookat at the maps
02:34 orlock you guys are all really crammed in there heh
02:34 deshipu "europeans think that 100km is far, americans think that 100 years is long"
02:35 deshipu no idea what australians think, they probably just chill out
02:35 deshipu on the reef
02:43 Jak_o_Shadows haha. Nah.
02:44 Jak_o_Shadows My commute is more than 20km
02:44 deshipu outrageous
02:45 Jak_o_Shadows That does make me on the outskirts, but not by too much.
02:45 Jak_o_Shadows Time wise it's still pretty quick.
02:45 deshipu my commute is about 3m
02:46 deshipu unless I feel particularly lazy, then I just drag the laptop into the bed
02:46 Jak_o_Shadows Dunno if you can quite compare that.
02:47 veverak :D
07:35 knob Hello!
07:43 Jak_o_Shadows hi
15:09 veverak deshipu: I wondered
15:09 veverak deshipu: if I would want to use Raspbi Pi A
15:10 veverak I suppose TOTE with blue servos would be ideal?
15:10 veverak if your PCB and raspbi mounted on top of your board
15:10 veverak *with your PCB
15:10 deshipu veverak: let me try it on for size
15:10 veverak and talking via SPI to the arduino actually controling
15:10 veverak deshipu: I can make adapter to mount it on
15:10 veverak :)
15:11 deshipu it sticks out quite a bit
15:11 veverak is it worth to make base made for it?
15:11 veverak I mean, it should be trivial enough for me
15:11 veverak :)
15:11 veverak :D
15:11 deshipu my pcb is 5x5cm
15:11 mrdata teeny
15:12 deshipu the pi is about 5.5x6.5cm
15:12 deshipu but
15:12 deshipu you can make the robot larger
15:12 deshipu use a permaboard
15:13 deshipu or make your own pcb
15:13 deshipu with a socket for the pi
15:13 deshipu if you make it square, you will only need to change one constant in the code
15:13 veverak yeah
15:13 veverak exactly
15:13 veverak also
15:13 veverak weight?
15:13 veverak that was other thing I was worried about
15:14 veverak I suppose raspbi A + it's camera got more weight than normal arduino
15:14 deshipu https://hackaday.io/project/6050-tote-affordable-spider-robot/log/24644-weight-lifting
15:14 veverak well, yeah...
15:14 deshipu but that's with SG92R servos for the knees
15:15 deshipu which I recommend anyways
15:15 deshipu because the black servo horns look badass
15:16 veverak nah
15:16 veverak I can find only SG90 sold in packs
15:17 deshipu you need 8 sg90s and 4 sg92rs
15:17 deshipu aliexpress has them :P
15:17 veverak yeah, I see
15:17 veverak thinking about 12 sg92rs
15:17 veverak 14 actaully
15:17 veverak 2 for webcam maybe ;)
15:19 deshipu that's just a waste
15:19 deshipu also, they will drain the battery faster
15:19 deshipu I think
15:20 deshipu hmm, maybe not?
15:20 deshipu if the load is the same...
15:20 veverak well, I want bigger/heavier board
15:20 veverak webcam
15:20 veverak another servos for a webcam
15:20 veverak and because raspbi+webcam will waster battery fast by themself
15:20 veverak little bigger battery than default
15:20 deshipu sure
15:20 veverak deshipu: they will drain more but should not noticeably
15:20 veverak :)
15:21 deshipu another problem with more servos
15:21 veverak or, I can make propably it servoless
15:21 deshipu you can't connect it to the arduino
15:21 veverak deshipu: have you tried to make my idea about 6 dof work?
15:21 deshipu you will need to either control them from pi, or add another pro mini
15:21 verak would try to
15:21 veverak :)
15:21 veverak deshipu: nah, screw it
15:21 veverak no another servos
15:21 veverak not necesarry propable
15:21 deshipu because the arduino library only supports 12 servos at max
15:21 deshipu you would have to write your own pwm code
15:21 veverak ok
15:22 deshipu which is doable, but boring
15:22 deshipu veverak: you want a pcb for the base?
15:22 deshipu veverak: I can send it to you, or I can bring it to pycon.cz
15:23 deshipu (the servos should arrive by then)
15:24 veverak ehmm
15:25 veverak have to wait for salary
15:25 veverak O:)
15:25 veverak deshipu: put PCB would be awesome
15:25 deshipu sure, I have lots of them
15:26 deshipu by the way, if anybody else here want to build http://tote.rtfd.org just let me know
15:26 deshipu wants*
15:26 veverak deshipu: make it two pcb
15:26 veverak few of the guys in local hackerpsace were interested
15:26 veverak at least one could make it rela
15:26 veverak *real
15:26 veverak :)
15:30 deshipu I can also send you some of the older versions
15:42 deshipu veverak: ping, see the private message
17:51 rue_mohr who is awake?
17:51 ace4016 everyone!
17:57 sherlock me
18:20 theBear it's true, he is
18:25 Snert_ that is only a theory.
18:25 Snert_ one that must be proven in the negative or the positive.
18:28 theBear it was a statement of blatant factory !
18:29 Snert_ but now, multiple microseconds later it may not still be true.
18:29 Snert_ after all, we didn't latch the datum.
18:30 Snert_ he could be snoozin' after a good lunch
18:43 sherlock I ate leftover lasagna
18:46 theBear well yeah, maybe not then, but my statements are always fact, trust me :)
18:51 rue_mohr who is awake!
18:51 rue_mohr but if you observed it you probably changed it
20:14 Snert_ anyone hate hantek scopes?
21:38 mbrumlow Come and play! http://pluto.brumtopia.com:8080/indexl.html
21:57 ace4016 interesting
22:17 rue_mohr gizzard, my doing_stuff() is being replaced by sleep()
22:19 rue_mohr is that what we are?
23:48 anniepoo what are controls
23:52 anniepoo good demo of something - controlling this thing is hard, obviously an autonomous controller that would
23:52 anniepoo go through same api, it'd have the same issues.
23:53 anniepoo whats the dbl headed arrow?
23:53 Kamondelious that locks/unlocks the sliders
23:54 anniepoo I see
23:55 anniepoo well, neat!
23:56 Kamondelious Indeed
23:56 anniepoo I see a blue light when I get near a divider