#robotics Logs

Dec 11 2015

02:37 fleshtheworld what motors give you accurate control for speed?
02:37 fleshtheworld is it hard and or costly to make your own motors?
02:38 deshipu yes
02:39 deshipu the problem with accuracy+speed is weight
02:39 deshipu because heavy elements won't stop when the motor stops, they will want to continue moving
03:09 anonnumberano fleshtheworld, your question is incorrect
03:10 anonnumberano how much torque do they need to deploy? how fast do they need to rotate?
03:14 fleshtheworld i mean what kind of motor allows you to control the speed of the motor? or how can you control the speed of a motor?
03:15 fleshtheworld im looking for a dynamic control motor, rather than a constant type of motor that turns on or off
03:17 fleshtheworld dynamic control motor... as in where you can control the speed / torque
03:26 Hyratel you need a motor driver
03:26 Hyratel speed is not a fucntion of the motor
03:26 Hyratel you use a control that switches it very fast
03:27 Hyratel and this switching is faster than the time it takes the motor to noticably speed up or slow down, meaning the motor spins smoothly
03:27 fleshtheworld stepping motor?
03:27 Hyratel this is called PWM, or Pulse Width Modulation
03:27 Hyratel look it up
03:28 Hyratel also to look up, "H Bridge", "H bridge motor driver"
03:28 fleshtheworld yeah i was just starting to study up on it
03:28 Hyratel stepper motors are a special kind of motor
03:28 Hyratel they are not "Spin Motors"
03:29 fleshtheworld ok yeah was wondering about that
03:29 Hyratel they are designed to accurately turn a precise number of notches and then hold that position until turned by another instruction
03:30 Hyratel Brushed DC motors use an internal Commutator (look it up), which makes sure the magnetic torque angle is constant between the rotor and stator
03:30 Hyratel brushless DC motors use electronic commutation, where a switching circuit changes which coils in the stator are energised to maintain the magnetic torque angle
03:31 Hyratel because of this, they can hold much more precise RPM speeds, and are used in the spindles of high precision devices, such as hard drive and CD drive hubs
03:32 deshipu also, since they don't have a mechanical comutator, they last longer
03:32 Hyratel there are also no commutator brushes to wear down - every time the brushes cross the gaps on the commutator ring, it generates an electric spark that erodes both brush and ring
03:32 deshipu that's what I meant
03:33 Hyratel i was being more wordy :)
03:33 deshipu the words don't come to me today
03:33 Hyratel the downside to brushless is they require a much more sophisticated driver, and cannot be run without one
03:34 Hyratel a brushed DC motor can be connected directly to a battery and it will work
03:34 deshipu but since you connect it to a microcontroller anyways
03:34 deshipu in case of robots
03:34 deshipu that's not such a bad thing
03:34 veverak also, brushless are much more effective :)
03:35 veverak + you can modify maxspeed/torque ration on the run
03:35 deshipu I wonder why they still use brushed motors inside servos
03:35 Hyratel hobby servos?
03:35 veverak there are brushless servos
03:35 veverak :)
03:35 veverak even in hobby sector
03:35 deshipu yeah
03:35 deshipu seems like brushless would be cheaper?
03:35 deshipu and lighter
03:35 Hyratel the logic isn't
03:36 deshipu the logic is a single custom chip anyways
03:36 veverak yeah, but harder to test ?
03:36 veverak http://www.rcmart.com/savox-high-speed-brushless-steel-gear-digital-servo-voltage-p-36750.html?cPath=1099_1030
03:36 veverak that price :D
03:36 Hyratel fleshtheworld, http://www.ebay.com/itm/Free-shipping-APO-L1-DC-brush-motor-PWM-controller-RC-speed-controller-/301819074800
03:39 fleshtheworld i see, somewhat expensive :)
03:39 Hyratel also that page has a nice visual explanation of PPM Servo signalling
03:39 Hyratel hahahaha that's cheap
03:40 Hyratel http://www.andymark.com/Talon-SRX-p/am-2854.htm
03:41 fleshtheworld looks fancy
03:42 Hyratel anyway, it's past 4 AM
03:42 Hyratel night!
03:42 fleshtheworld thanks for info, night
03:44 Hyratel i can now claim i can give this lecture "practically in my sleep"
03:46 anonnumberano fleshtheworld, the reason it is expensive is because it can drive powerful motors, 240W is "pretty powerful"
03:46 anonnumberano do you have some robot project in mind?
03:47 fleshtheworld yes
03:47 anonnumberano what is it?
03:48 fleshtheworld im going to build a cheap prototype humanoid robot to practice and perfect its design
03:48 anonnumberano ah that's very nice
03:49 fleshtheworld i was hoping it would cost no more than a few hundred dollars if even that
03:49 anonnumberano yeah for a small one
03:49 fleshtheworld yes about 6 in to 1 feet
03:50 anonnumberano just spend the least amount of money (by reducing the physical size) while still keeping the really hard engineering challenges associated with it, so you don't waste your time
03:50 anonnumberano Depending on the time you have you can either pick a motor and buy them, or make your own.
03:51 fleshtheworld for prototypes, i imagine i would lose anything in making them smaller. when i am satisfied with it, i can start building it bigger
03:52 fleshtheworld would'nt lose anything*
03:53 fleshtheworld the only thing i cna think of is weight but i can work around that
03:53 anonnumberano yeah that's how it works, although if you make something that has huge feet it's obviously gonna be too easy cause you won't need to balance the robot (so it doesn't fall). I mean huge feet would make it stable no matter what and that would be a mistake cause humans are not like that.
03:53 anonnumberano Do you have a robot in mind that you want to make one just like it or better?
03:54 anonnumberano Like the NAO, etc..
03:54 fleshtheworld i would never give it huge feets to make it easier for the balance
03:54 fleshtheworld well i have always wanted to build a robot of my own
03:54 fleshtheworld i like what boston dynamics have done with their android
03:55 anonnumberano Mine has kind of big feet and I'm thinking of making them smaller cause otherwise walking with a human motion will be harder.
03:55 fleshtheworld yes, bigger feet would be masking the problem of balance and causing other problems at the same time.
03:55 anonnumberano I'm using this kit: http://www.amazon.com/SainSmart-Educational-Bracket-Hobbyists-Competition/dp/B00DR7GA4I/ref=sr_1_1?ie=UTF8&qid=1449826267&sr=8-1&keywords=sainsmart+17+dof
03:56 anonnumberano built, it looks like this: https://i.ytimg.com/vi/EiJhlflpGEo/maxresdefault.jpg
03:56 anonnumberano <fleshtheworld> yes, bigger feet would be masking the problem of balance and causing other problems at the same time.
03:57 anonnumberano yes that's my thought exactly..
03:57 fleshtheworld pretty cool, i tihnk i might have seen that robot before
03:57 anonnumberano it's the cheapest pretty much if you don't want to create your own body
03:57 anonnumberano there is another one but I didn't like it as much.
03:58 fleshtheworld i think designs like big feet to compensate for balance are the type of ideas in robotis, AI, etc. that has held people back from advancing in those areas
03:59 fleshtheworld stopping them from designing solutions to it
03:59 fleshtheworld *better solutions
04:00 fleshtheworld yeah i want to make a costume body frame, but that might be too far out for me currently
04:01 anonnumberano for mine, once it "kinda" works, like able to take a few steps or just stand up, I'll 3D print some kind of gundam armor for it
04:01 anonnumberano they would just clip around the metal parts of the body easily
04:01 fleshtheworld is 3d printing not good enough to a body frame?
04:01 fleshtheworld for a body frame*
04:02 anonnumberano It probably is if you are feeling very inventive and have a lot of time to spend for mechanical engineering...
04:03 anonnumberano For me i consider it is a liability compared to aluminum parts and metal bearings and stuff.
04:03 anonnumberano And motor attachment positions.
04:04 anonnumberano All i care about is make it stable and move and stuff. Then making it look nice would be the easier part, and not necessarily very interesting.
04:04 anonnumberano Although cool. Good for the right part of the brain :)
04:04 fleshtheworld bulky robots are cool
04:04 anonnumberano Makes it easier to sell too lol if you're gonna try and sell your robot.
04:04 fleshtheworld its just im planning on making an agile robot
04:05 anonnumberano wait what? that's like my goal :)
04:06 fleshtheworld im sure its what many humanoid robot maker are after
04:07 anonnumberano well, surprisingly and even in here, many people want to play with camera robot vision, make cute robots
04:07 deshipu cute robots ftw!
04:07 anonnumberano haha
04:07 deshipu but not humanoid
04:07 deshipu those are creepy
04:07 anonnumberano I just want to make creepy robots I guess.
04:08 anonnumberano "It's aliiive!!"
04:11 anonnumberano deshipu, are you running a maximum of 6 servos at any time on Tote?
04:11 anonnumberano >at any time
04:13 deshipu anonnumberano: 12 at all times
04:14 deshipu why?
04:15 anonnumberano because I have been trying to do so but some signals got interference when i changed others, i got all the way to 12 servos, then went back down to 4 and they were working together perfectly, I'm quite puzzled.
04:16 deshipu anonnumberano: that's an avr?
04:16 anonnumberano i'd move a pwm and that would jitter another one pretty hard for a short time, then I'd move another one and a third pwm would actually jump to constant 5V signal..
04:16 anonnumberano yeah the pro mini
04:16 deshipu anonnumberano: how are you powering them?
04:16 anonnumberano i need to try again on a standalone atmega328
04:17 deshipu anonnumberano: too low current is a common cause of servo jitter
04:17 deshipu anonnumberano: or rather, voltage drop
04:17 anonnumberano it wasnt servo jitter it was by looking at the pwm waves on my oscilloscope
04:18 anonnumberano I had port D and port C on to run 12 servos and it didn't run right after i thought it would from testing each pwm individually.
04:18 anonnumberano i should try again back on one of my standalong pdip atmega328p chips
04:18 anonnumberano maybe they allow more current out through the pins
04:20 deshipu ah, I'm not using pwm
04:20 deshipu I use the Arduino Servo library
04:20 deshipu which uses a timer
04:20 anonnumberano yeah that's pwm
04:21 deshipu no, it uses a separate timer
04:21 deshipu and in the timer, has a routine that switches the pin state
04:21 deshipu the timer is not in pwm mode
04:21 anonnumberano that's the same way I was doing it, and me neither im not using the "hardware pwm" thing
04:22 anonnumberano i tried servo lib first but wasn't happy with it i forgot why
04:22 fleshtheworld what is the hard part in making your own costume body frame, lets say if you have the means to build / sculpt the body frame?
04:22 deshipu anonnumberano: have you seen https://github.com/thebiguno/stubby/tree/master/avr/lib/pwm ?
04:23 deshipu fleshtheworld: weight/rigidity
04:24 anonnumberano ahh, that's not stuff that I know yet
04:24 deshipu anonnumberano: there is an explanation
04:24 anonnumberano prescalers, hardware compare, interrupts...
04:25 deshipu anonnumberano: https://hackaday.io/project/770-stubby-the-teaching-hexapod/log/1361-pwm-waveform-generation
04:26 fleshtheworld i need to build me a robot soon one day, even if just from a kit :) would help me so much
04:26 anonnumberano no fleshtheworld robots are for nerds
04:27 anonnumberano thanks deshipu nice link, looks interesting with answers to all my frustrations
04:28 anonnumberano wow the .S file is in assembly
04:35 fleshtheworld well... im sure youve see nthis already lol... https://www.youtube.com/watch?v=ufOz00oYzZM
04:36 fleshtheworld the robot with the baloon is too good
04:37 anonnumberano oh man let's talk about this tomorrow that's what I'm doing
04:37 anonnumberano im making one of those
04:45 fleshtheworld ...before 2015 is over... i will have made at least 1 robot. If not, then that means i will never ever get to ever making one.
04:59 SpeedEvil Is someone going to shoot you in the head on Jan 1 if you haven't?
05:21 anonnumberanon Some friends in my Senior Design capstone class in engineering had 2 semesters to make a servo robot arm and they really struggled lol
05:25 deshipu it's not easy
05:26 veverak :)
05:27 veverak deshipu: have you thought about making "shields" for tote board?
05:27 deshipu veverak: briefly, but that would require a completely different design
05:27 veverak (it struck me when I was designing pinout board for esp8266)
05:27 veverak deshipu: you sure?
05:28 veverak deshipu: I was able to stack two of your boards on top just with threaded collumns
05:28 veverak (and little widening of some holes)
05:28 deshipu ideally they would hold together with just the pin headers
05:28 veverak yeah
05:29 deshipu I don't really have many ideas for a useful shield
05:29 deshipu maybe with the pi zero version
05:29 veverak yeah
05:29 veverak zero shield, esp shield, vocore shield ...
05:29 veverak :)
05:29 deshipu ah, that
05:30 deshipu not sure, tbh
05:30 deshipu I mean, you can just have the base board in different versions
05:31 deshipu I'm still waiting for the one for rpi
05:31 veverak than you can't switch easily between versions
05:31 veverak making base board with pernament arduino and than just switch "top board" based on what you want to play with seems nice
05:32 deshipu http://paste.sheep.art.pl/8ba1e914-eb76-49ba-9b31-29dd97dc0ac7/%2Binline
05:32 veverak also it means that you can play with multiple versions on one set of legs...
05:33 veverak which money-wise is nice to 'lure people" in
05:33 veverak deshipu: you wan to control it by rpi?
05:33 deshipu yes
05:33 veverak (servos)
05:33 deshipu with servoblaster
05:33 deshipu I did some testing, should work
05:34 veverak interesting
05:35 verak wonders if realtime kernel modifications will be ne
05:35 veverak I know that linuxcnc got exactly that... not sure if here it will be needed :)
05:35 deshipu iirc servoblaster uses dma
05:36 veverak I see
05:37 veverak deshipu: also, strongly considering re-wiring servos
05:38 veverak small connectors ... :)
05:38 veverak cut wire near the servo body, attach connector
05:38 veverak and make wire of length only needed between body and servo
05:39 veverak AND merging gnd/vcc lines
05:39 deshipu veverak: yeah, https://hackaday.io/project/3301-pico-kubik-quadruped-robot
05:39 deshipu veverak: and use smaller plugs
05:40 deshipu veverak: you do want to make them individually detachable, though
05:40 veverak that's why I want another connecter near the body of servo
05:41 veverak ideally putting that connector into the plastic body
05:42 anonnumberanon like those digital servos and their daisy-chaining
05:42 veverak exactly
05:42 deshipu veverak: I have this project for ripping out the electornics and putting an attiny indside those servos
05:42 veverak nah
05:42 deshipu veverak: then you can put them all on one i2c bus
05:43 veverak that would be awesome
05:43 veverak deshipu: but I always don't believe I would be able to multiply the proces 12 times
05:43 deshipu right
05:44 verak still thinks that first person that will be able to sell SG90
05:44 veverak will get reach
05:44 veverak or at least loved with hobby community
05:45 veverak *rich
05:46 veverak damn it, my english
05:55 anonnumberanon deshipu have you tried running an openservo board yet?
05:56 deshipu anonnumberanon: no, those are too expensive
05:56 anonnumberanon like $10 in parts?
06:00 deshipu $15 for the pcb alone
06:03 anonnumberanon it would only be worth it if the hardware (motor gears case) were also excellent and durable.
06:06 anonnumberanon what is the most cost. the mosfets? is there a price list?
06:10 deshipu I only saw them selling the complete boards for like $30
06:11 deshipu which sounds bad, considering you can get a dynamixel for $40-something
06:12 anonnumberanon yeah but nothing is open in dynamixel
06:12 anonnumberanon http://openservo.com/BuyOpenServo
06:12 anonnumberanon bottom of page
06:13 anonnumberanon 10 dollars in parts
06:13 anonnumberanon in any case its not the most useful priority to do for servos
06:14 anonnumberanon priority is to make them less shit in general
06:15 anonnumberanon in order: case, gears, motor
06:18 deshipu they use servos that are pretty good mechanically
06:20 deshipu of course, the sg90s I use are quite bad
06:21 Snert__ it's whether or not that openservo board will fit inside a quality servo that I would buy.
06:21 anonnumberanon well yeah but im not talking about making something better than an ax12 i mean something as good as ax12 and twice as cheap
06:23 anonnumberanon for ex my servos are $8 and just as strong as ax12 but they have only 130% of the lifespan before the plastic case gets worn out
06:23 anonnumberanon 30%
06:24 anonnumberanon yes sg90 is shit but it can probably be made better with some really cheap aluminum case im thinking
06:25 Snert__ that's like putting lipstick and a miniskirt on grandma.
06:25 deshipu optimizing the cost only makes so much sense
06:25 Snert__ why bother.
06:25 anonnumberanon the main engineering challenge is yo mass produce aluminum servo cases from diy tools
06:25 deshipu anonnumberanon: your work costs more than you save
06:26 anonnumberanon obviously, unless there is a way to cnc them
06:27 deshipu then you need an expensive cnc machine and wear its expensive bits
06:29 anonnumberanon we need a "The Liberator" of hobby servos.
06:30 anonnumberanon it was a sheetmetal stamped one shot gun during ww2
06:31 deshipu I'd rather use multiple-shot servos for my projects
06:31 deshipu they require a lot of work, you know
06:35 anonnumberanon its not for me i can just buy 20 high dollar servos and call it a day if i want to. it's for people who have more time than money
06:35 anonnumberanon wgich will happen more and more as time passes the way the job market is headed
06:36 anonnumberanon :)
06:39 SpeedEvil yeah - like the robotic challenge DARPA thingy with every robot costing a large slice of a million
06:40 deshipu big robot, big money
06:41 deshipu also, they included their salaries in it
06:43 veverak :)
06:58 Snert__ I dont think that openservo project is going to make it.
06:59 Snert__ Way too difficult to buy one.
06:59 Snert__ I can't even find a $ sign anywhere on their web pages.
07:12 veverak exactly
07:12 veverak :)
07:13 verak founds that "how hard is to get one" is crucial for
07:13 veverak don't wnat to endup using something that will be hard to get
07:13 Snert__ or become unsupported in short order because of no sales.
07:14 Snert__ I'd buy 2 right now. Along with whatever servo they bless.
07:28 robotustra Morning
08:30 tecdroid nice XD
08:30 tecdroid hi
08:30 tecdroid just tried some channel names
09:21 elektrinis anyone building large robots and looking for modulat lithium batteries?..
09:21 elektrinis I might have a solution.
09:22 elektrinis https://mega.nz/#!UpxiATDJ!IFtVhpIOUxakf3gkoPdVXx1t4EMJy6x323KIWQErbs0
09:22 elektrinis https://mega.nz/#!A8JiEZbQ!Er5qfXK5u5cMG5D2p2PeGnvve3nxESKF2APu5QbCyio
09:31 SpeedEvil need more data.
09:31 SpeedEvil Price is an obvious question.
09:34 SpeedEvil 'pressure buildup' is one thing on cell failure.
09:34 SpeedEvil Chain reacting is another.
09:34 SpeedEvil What happens if a cell vents with flame.
09:34 SpeedEvil With the pack charged and under load and at max service temp.
09:34 SpeedEvil I note even Boeing got this wrong.
09:34 rue_house what happens if its hit by an asteroid?
09:34 rue_house I think thats important
09:35 SpeedEvil Cell failures in large packs are hardly unknown.
09:35 SpeedEvil If you're going to claim you can bolt hundreds of thousands of cells together, you need to actually show you can deal with it
09:36 rue_house dos't mean there in series... does it?
09:37 SpeedEvil so?
09:37 SpeedEvil Series or not matters not at all
09:39 rue_house sure 10000 batteries in parallel aren't gonna arc over
09:43 SpeedEvil I am not referring to arcs.
09:44 SpeedEvil But to cell failure causing flame, propagating thermally to adjacent cells.
09:51 rue_house what conditions are you proposing cause the battery to ignite?
09:53 robotustra .nz = new zeland?
09:54 robotustra zealand
09:56 robotustra Li-ion is already out of date
09:56 robotustra LiFePo4 is the battery a la mode
09:57 robotustra it's tolerant to overcharge, do not need to be balanced,
09:57 robotustra 2000+ recharges
09:58 robotustra 3 times more stored energy for 1 kg of weight with comparison to lead battery
09:58 robotustra for final version of my robot I'll but LiFePo4 batteries pack
09:59 robotustra for tests will use lead batteries
10:02 robotustra Li-ion batteries die in 3 year of use or 500+ charges about
10:02 robotustra because of decay of electrodes
10:24 SpeedEvil rue_house: shit getting real.
10:26 SpeedEvil http://news.bbc.co.uk/1/hi/business/4793143.stm
10:26 SpeedEvil (contamination in lithium batteries leading to fires)
10:27 SpeedEvil https://en.wikipedia.org/wiki/Boeing_787_Dreamliner_battery_problems problems with the construction of cells leading to fires
10:31 SpeedEvil http://www.alphr.com/news/388174/sony-warns-of-fresh-vaio-battery-fires oops
18:17 robotust1a http://i.ebayimg.com/images/g/I10AAOSwT4lWTty-/s-l1600.jpg
18:19 anonnumberano LMAO
19:57 Hyratel another bonus to LiFePO4 - you can charge them with LiIon/Poly chargers or 4S PbA chargers
19:57 robotust1a true
19:57 Hyratel 4S LiFe is almost the exact same peak voltage as a 6s lead acid
19:58 Hyratel and they don't give a fuck about the charge curve
19:58 robotust1a that's what I plan to buy
19:58 robotust1a 24 V nominal 20 AH LiFePo4
19:58 robotust1a it could be almost 30 Volts
19:59 robotust1a I got some used lead batteries for free to test my wheeled base
20:00 robotust1a 4 batteries weight like 22 kg
20:03 robotust1a Saturday? everyone is off?
20:05 SpeedEvil you do need to balance them still
20:05 SpeedEvil and monitor the balance
20:05 robotust1a yes, I know, I'll do the charger controller on the base of arduino
20:06 robotust1a and curren sensors
20:06 robotust1a and voltage sensors
20:07 robotust1a and will charge them one by one
20:14 Hyratel robotust1a, got pics?
20:15 rue_house voltage sensors!
20:15 rue_house wherE!
20:15 rue_house how much!
20:26 akem hey, robotust1a you got a cnc with nema if i'm not mistaken, what alimentation you use with it?
20:30 akem anyway i got mine 17 and 23
20:33 robotust1a voltage sensor is 2 resistors actually
20:33 robotust1a Hyratel: the pucture of what?
20:34 Hyratel of your rolling frame
20:35 robotust1a robotustra.ca/my-robot
20:35 robotust1a robotustra.ca/my-robot-done
20:37 Hyratel hey, those tires look familiar
20:37 Hyratel https://dl.dropboxusercontent.com/u/33593534/images/Robot/20131123_212647.jpg
20:40 robotust1a yeah, it's standard wheels
20:40 robotust1a 10"
20:41 robotust1a https://addison-electronique.com/pneu-a-air-de-10.html
20:43 robotust1a there is another variant of it https://addison-electronique.com/pneu-plein-de-10.html
20:43 robotust1a Hyratel: is it your frame on the picture?
20:45 Hyratel yes
20:46 Hyratel https://dl.dropboxusercontent.com/u/33593534/images/Robot/DSCN2011-1k2.jpg
20:46 Hyratel https://dl.dropboxusercontent.com/u/33593534/images/Robot/DSCN2016-1k2.jpg
20:49 robotust1a 12v 7Ah?
20:49 Hyratel yeah
20:50 robotust1a how long it can run?
20:50 Hyratel we've since upgraded to 12V 18AH, and it'll go about a half hour of medium hard running
20:50 Hyratel range of ... around a half mile?
20:50 robotust1a what is the current draw?
20:51 Hyratel no idea
20:51 robotust1a do you run it at fool power or PWM?
20:51 Hyratel pwm
20:51 robotust1a arduino?
20:51 Hyratel ye
20:52 Hyratel https://dl.dropboxusercontent.com/u/33593534/images/Robot/DSCN2012-1k2.jpg
20:52 robotust1a I'll use very small motors + big reduction
20:52 Hyratel 10mph top speed
20:52 robotust1a mine is onlu 3.6 km/h
20:52 robotust1a only
20:54 robotust1a what is RF module?
20:55 robotust1a 2.4 GHz?
20:55 robotust1a how do you control it?
20:55 Hyratel http://www.amazon.com/REDGO-wireless-Gaming-Receiverfor-Controller/dp/B0194FCK9U
20:56 robotust1a 15 meters only?
20:56 Hyratel gets more like 30m
20:56 robotust1a ok
20:56 Hyratel 100 feet, straight line of sight outdoors
20:57 robotust1a good
20:58 robotust1a for the base I want to spend not more than 24 watts for all motors
20:58 robotust1a indoor of cause
21:03 robotust1a do you use it now?
21:03 Hyratel not much lately
21:04 robotust1a what are you doing now?
21:26 Hyratel what do you mean
21:40 robotust1a do you have any robo project?
21:40 robotust1a I did some updates http://mitm.mooo.com/~onick/robot/base1.jpg
21:41 Hyratel does anybody have a list of RasPi Compatible board? I know about the Odroid off the top of my head
21:41 robotust1a plenty of them
21:41 robotust1a tinsie
21:41 robotust1a tinsy?
21:41 robotust1a teensy
21:41 Hyratel that's not a raspi-class board
21:41 robotust1a ok
21:41 robotust1a beagle bone black?
21:42 robotust1a cubie board?
21:42 robotust1a Nvidia tegra?
21:42 robotust1a winboard?
21:42 robotust1a edison?
21:42 Hyratel I'm liking the Odroid-C1 because it's the raspi form factor, and has an infrared reciever
21:42 robotust1a glileo?
21:43 robotust1a I have edison, it's even smaller
21:43 robotust1a 30 x 60 mm
21:43 robotust1a has built in wifi
21:43 Hyratel yeah but it doesn't have video. i'm thinking about a media center
21:44 robotust1a so BBB
21:44 robotust1a is OK for your needs
21:44 robotust1a http://beagleboard.org/BLACK
21:44 Hyratel spendier than a pi
21:44 robotust1a it's mych faster
21:45 robotust1a much
21:45 robotust1a plenty of gpio
21:45 Hyratel I'm looking at price compare of $70 for Board+storage+case+power+remote
21:45 robotust1a hdmi, sdcard
21:45 robotust1a ethernet
21:45 robotust1a 2 usb
21:46 Hyratel GPIO is not a focus because I want to Set And Use
21:47 Hyratel I need -HDMI -USB -Network (W/LAN) -IR (if possible)
21:47 Hyratel and something with an existing Media Center community/project
21:48 robotust1a Rpi
21:48 Hyratel fair then
21:48 robotust1a odroid is of higher price
21:48 robotust1a the same range as BBB
21:48 Hyratel gotcha
21:49 robotust1a oh no, BBB has 1 USB port only
21:51 robotust1a http://mitm.mooo.com/~onick/robot/base2.jpg
21:52 robotust1a http://mitm.mooo.com/~onick/robot/batteries.jpg
21:52 Hyratel neat chassis
21:53 robotust1a battery pack is 22 kg
21:53 robotust1a the same with lifepo whould be about 10kg
21:55 robotust1a should fit inside the box all this
22:32 akem i think im gonna try PC laptop power supply for the steppers 100W 12/24 V
22:33 robotust1a what steppers?
22:34 akem nema17/23
22:34 robotust1a what resistance?
22:34 robotust1a of phases?
22:36 akem http://wiki.zentoolworks.com/images/e/e8/Nema17_42BYGH47-401A_Specs.jpg
22:37 akem but its not significative apparently, rated voltages etc from what i just read on reprap
22:39 robotust1a 1.33 A for each?
22:40 robotust1a how many motors?
22:40 robotust1a 3?
22:40 akem robotust1a you got some of theses too?
22:40 akem just 1 at 1 time atm
22:41 robotust1a what do you mean?
22:41 robotust1a so this power supply should work
22:41 akem but Nema17 is smaller
22:42 akem yea i hope so, complicated to find out good ones, PC laptop ones sounds ok
22:42 robotust1a I use one for my cnc mill which could give up to 40A but it's overkill
22:43 akem robotust1a i mean you also use some step motors for your projector experimenting with them? is it you with the CNC?
22:43 robotust1a it actually chould work at 10A
22:43 akem okay right
22:43 akem which one is it?
22:43 robotust1a you can buy good one 12V 10A at ebay
22:44 robotust1a http://www.ebay.com/itm/AC-110V-220V-TO-DC-12V-10A-120W-Regulated-Transformer-Power-Supply-For-LED-Strip-/371422642034?hash=item567a83bf72:g:RpsAAOSwLVZV4D~X
22:46 akem i mean what stepper model is your cnc? / yea i saw some of theses LED strips power supply not sure about them, you got some of them too? doing welll?
22:46 akem cheap ones
22:47 robotust1a I told you I use one like this for cnc
22:47 robotust1a works good
22:47 robotust1a https://i.imgur.com/rFKWaEp.gifv
22:48 robotust1a I use NEMA17 with 2 Ohm resistance for one phase
22:48 robotust1a similar to yours
22:49 akem ok
22:50 akem "now where is c3p0"
22:51 rue_shop3 the number of M3 screws I'm taking on is becomming a problem
22:51 akem shiny lower backs
22:51 rue_shop3 at this rate, if I ONLY use M3, I'm never gonna catch up to the supply
22:52 robotust1a use M4
22:53 robotust1a I also run out of small screws, have to order some
23:00 rue_house I dont think you understand
23:00 rue_house almost all the scrwes from the printers I'm stripping are M3
23:00 rue_house I have more M3 than I know what to do with
23:00 rue_house at this point the whole M3 section of the screw draws is overflowing
23:25 Tom_itx get bigger drawers
23:25 robotust1a send it to me
23:26 robotust1a all of them
23:43 rue_house your paying shipping on 60 lbs of screws?
23:43 robotust1a all sizes?
23:50 anonnumberano :)
23:52 robotust1a ok, I'll pay for 5 kg
23:52 robotust1a :)
23:52 robotust1a but you should sort them
23:53 robotust1a for now I'm going to sleep, talk about this deal later
23:53 robotust1a bye