#robotics Logs

Jan 11 2015

00:57 rue_shop4 Tom_itx, yup, working on the old cnc
00:57 rue_shop4 give 'er some upgrades
00:57 rue_shop4 see if I can not blow it up :)
01:00 rue_shop4 well, there I have a chassis schematic...
01:30 rue_shop4 arg I dont get it
01:31 rue_shop4 pipe thats 72mm in diameter
01:31 rue_shop4 so its circumfrence is 226mm
01:31 rue_shop4 if I heat it up and insert a block in it thats 50mm x 72mm it should just fit
01:32 rue_shop4 matter a fact, it should be a tight fit
01:32 rue_shop4 but its not, its all loose
01:37 Jak_o_Shadows LaTeX is really pretty
01:44 rue_shop4 arg
01:44 rue_shop4 root@blackie2:/tmp# circle -d 72
01:44 rue_shop4 Radius is : 36.000000
01:44 rue_shop4 Diameter is: 72.000000
01:44 rue_shop4 Circumfrence is : 226.194672
01:45 rue_shop4 root@blackie2:/tmp# calc 226/2
01:45 rue_shop4 226/2 -->> 113
01:45 rue_shop4 root@blackie2:/tmp# calc 113-50
01:45 rue_shop4 113-50 -->> 63
01:45 rue_shop4 so a 63mm x 50mm block should form a pipe with 72mm id diameter into a rectangle
01:45 rue_shop4 !?!?! right!?!?!
01:49 Triffid_Hunter rue_shop4: maybe it expanded when you heated it?
01:50 rue_shop4 by 4cm?
01:50 rue_shop4 this is why I hate math
01:51 Triffid_Hunter rue_shop4: sure, why not? you heat it up, anneal it, then smash a block in the end, why wouldn't it stretch rather than stay the same size and deform around the block?
01:51 Triffid_Hunter if I wanted the end to be rectangular, I'd compress it externally rather than stuffing a block in its mouth
01:52 Triffid_Hunter or at least get it the right shape externally, then stuff the block in its mouth afterwards to get the right size
01:54 rue_shop4 pvc pipe
01:54 rue_shop4 pvc pipe -> project box
01:54 rue_shop4 I think I'm gonna make a jig with pins and a motor
01:54 rue_shop4 later
01:54 Triffid_Hunter oh it's plastic? yeah it'll definitely stretch rather than deforming cleanly
01:55 rue_shop4 I'm gonna have to eat again, geez being biological is annoying
02:00 rue_shop4 ok how do I deal with these 25 connections...
03:27 mrdata only 25?
03:28 rue_shop4 the 25 isnt' the problem, the how was
03:28 rue_shop4 I used a modular barrier strip
03:59 rue_shop4 how the hell did it get to be 2am already!?
04:10 rue_shop4 Tom_itx, just hit me
04:10 rue_shop4 same way as a neutral comming loose
04:10 rue_shop4 if the ground came off a circuit that had both +5 and +24 on it, the 24 could find a way to the 5V by lifting the ground up
04:10 rue_shop4 of the ungrounded part of the circuit
04:17 rue_shop4 sweeet I found the encoder swtiches
04:45 rue_bed I should get some pipe and make a really ridgid cnc
04:45 rue_bed wait, I have pipe
04:45 rue_bed hmm
04:49 deshipu I have a dream
04:59 rue_bed and I have a name
04:59 Jak_o_Shadows I hate statics
11:25 GuShH rue_bed: https://www.youtube.com/watch?v=gvjrT4aSCfc
11:42 Mister i'm wondering something... you have a part inside robots that controls all the sevrvos and read sensors.. what is that part called?
11:44 Mister i think maybe deshipu called it a breakout board and gave a link for a good one but i didn't remember to bookmark that page :-S
11:46 Mister what do you call an arduino uno in the "robotics language" :-P
11:47 Mister http://arduino.cc/en/Main/ArduinoBoardUno
11:53 ace4016 a piece of crap :P
11:54 ace4016 the part that controls servos and reads sensors isn't called anything in particular as different architectures can do different things and are setup in different ways
11:55 ace4016 you might have a single chip to do everything; you might have some buffer circuits and isolated systems, you might have dedicated systems and a master system to coordinate...
11:55 ace4016 depends on scope, scale, and a few other things really
12:12 deshipu ordered my first pcb \o/
12:13 deshipu Mister: the part that controlls servos is called servo controller usually
12:13 deshipu Mister: breakout board is just that piece of a board with a lot of pins that "breaks out" chip's pins for easy access
12:14 ace4016 servo controller might be a software module on a chip too, rather than the chip soley dedicated to it
12:15 deshipu sure
12:15 deshipu but in this case I have an arduino board dedicated to it
12:16 deshipu with an additional small pcb that breaks out the power to the servos
12:16 Mister hmm.. so it doesn't have a name? it doesn't nessearily have to control servos, cuz it can send signals to a servo controller
12:16 Mister the computer can send much faster signals then me x-D
12:16 Mister it should be called the brain
12:17 ace4016 you can call it anything you want
12:17 Mister but what should i look for in a store? x-D
12:17 Mister or ask for?
12:23 deshipu Mister: in this shop they call them "robot controller" http://www.robotshop.com/en/dagu-en.html?cat=59
12:23 deshipu Mister: they are basically boards with some microcontroller on them, an H-bridge and a voltage regulator
12:24 deshipu Micro Magician looks nice :)
12:24 Mister and memory? for remembering what signals to send where when it recieves a certain signal from another source?
12:24 Mister or how does that work in a microcontroller?
12:27 Mister indeed x-D but some1 linked one that cost around 4 dollars a few days ago
12:27 Mister formed as a usb stick that one could snap in the iddle
12:27 Mister middle*
12:27 Mister with 42 pins
12:27 deshipu the microcontroller has memory build in
12:28 Mister aha
12:28 deshipu there are lots of microcontroller boards, not just dedicated for robots
12:28 Mister is that static memory?
12:28 Mister or dynamic?
12:29 deshipu iy has some flash memory, mostly for the program, and some ram, for running
12:29 Mister hmm are we speaking of microcontroller or that entire board now?
12:30 Mister i have always been wondering if anyone is able to hide an entire computer sinde a microcontroller in a nirmal desktop computerx-D
12:30 Mister normal*
12:31 Mister inside*
12:33 deshipu Mister: microcontrollers are entire computers
12:35 Mister uhm, hang on a second
12:35 Mister are all those black squares computers?
12:38 Mister if i send a signal into pin 1 of 10 and it send signals out from 9, would it be possible to reprogram the chip to send signals out from pin 3 and 5?
12:38 deshipu what?
12:39 deshipu the atmega328p is a small computer, yes
12:40 deshipu with a very weak cpu, small amount of memory and the ability to be programmed to receive and send signals on its pins
12:40 Mister hmmm that is very interesting
12:41 deshipu no idea where you got those pin numbers, though
12:41 Mister just an imaginary chip with 10 pins x-D
12:41 deshipu Mister: it's what Arduino is built on
12:41 deshipu so that micro-magician board is basically a smaller aduino board with some extra electronics on it for power, controlling motors etc.
12:42 deshipu and for handling usb
12:44 Mister hmm i have to be honest lol x-D it looks like we have mixed our technology with that of aliens
12:44 Mister or something.. :-P
12:44 Mister we should be able to solder a servo directly on the pins of a microcontroller and the entire board is unessesary
12:45 Mister basicaly a solid computer and the correct sice for the future devices
12:46 Mister can be molded into a ring and all the patents are ready
12:47 Mister are there transformers inside them aswell?
12:57 deshipu Mister: the board is there for convenience
12:57 deshipu Mister: also, you do need some passives, like a crystal and a couple of resistors
12:57 deshipu Mister: but yeah, people do that -- build robots directly on the chip
12:57 deshipu especially with the attiny85
13:00 deshipu Mister: http://letsmakerobots.com/node/18490
13:00 Mister crystal?
13:00 Mister hmm
13:00 Mister interesting
13:01 Mister i think this technology was "invented" in 1950s in israel
13:01 Mister microschips
13:01 deshipu as for transformers... https://www.youtube.com/watch?v=iAvG0buqa2Q
13:05 Mister sry german engineer filed the patent http://en.wikipedia.org/wiki/Integrated_circuit
13:08 Mister lool i must have one in real size! x-D
13:08 deshipu this one took 10 years to make
13:09 deshipu but the guy actually had a kickstarter to make one in real size
13:09 deshipu it was called J-deite
13:09 deshipu http://j-deite.jp/
13:44 Mister deshipu: hmm.. about kickstarter
13:45 Mister do you think these scetches could be used there? http://www.tundra-telebotics.com/
13:45 Mister i made a small one out of wood but a mechanical one that uses anothe rprinciple to stand straight
13:46 Mister and don't require power
13:46 Mister but you have to push it x-D
13:56 deshipu Mister: as far as I know, you need to have a business plan and such for kickstarter
13:57 deshipu Mister: also, you need to live in USA or UK
14:00 Mister they opened in norway a few months ago
14:00 Mister hmm, so i should start thinking of massproducing and starting a company? :-P
14:06 deshipu well, that's what kickstarter is mostly for
21:41 codepython777 does anyone have a recommendation for a good camera for my bot? (lightweight and usb/firewire preferably) > 60fps?
21:51 MjrTom kinect v1, even though its << 60 fps
22:01 codepython777 MjrTom: I'm looking for something that can see a little farther than kinect
23:07 rue_shop3 ok I deleted all the join and quit messages
23:08 rue_shop3 now maybe I can see what people said
23:19 arko deshipu: that transformer bot is amazing
23:23 codepython777 for rc cars, brushless motors vs gearmotors, Can anyone tell me pros/cons? (apart from price)
23:29 veinofstars i’m gettin so high
23:35 codepython777 why do people use brushed motors for rc trucks?
23:35 codepython777 why not brushless?
23:37 rue_shop3 eletrical durability
23:37 rue_shop3 cost
23:38 codepython777 rue_shop3: what would you use if price was not a concern?
23:39 rue_shop3 rc truck?
23:40 rue_shop3 hmm
23:40 rue_shop3 what would I be doing with this rc truck?
23:41 codepython777 rue_shop3: lug around 1.5kg weight
23:42 rue_shop3 I think that brushed would have a better torque and overload performance
23:42 rue_shop3 Tom_itx, for the record, I'm working on the oven again