#robotics Logs
Apr 17 2012
#robotics Calendar
09:05 rue_house lake mead, never heard of it
09:17 Skwint maybe it's a lake OF mead?
09:17 Skwint good place for a party
09:20 rue_house its a rather larege lake outside of las vagas
09:21 rue_house on the border between nevada and arizona
10:01 rizlah Went there on Fallout.
11:06 SolarNRG This guy has printed me a set of BIG gears with his 3D printer, what do you guys thinK? http://imgur.com/a/9dLDr#17
11:08 rizlah What do you need big gears for?
11:16 SolarNRG I'm going to melt bronze and make copies of them so I can make 100 skydishes all turn and track the sun
11:16 SolarNRG And prodce a lot of steam for a steam turbine to generate electricity
11:16 SolarNRG :)
11:29 genesis you'll have the power :)
11:30 SolarNRG I'll then change my name to HE-MAN
11:30 SolarNRG I HAVE THE POWER OF GREY SKULL
11:42 DanFrederiksen SolarNRG, ultimately aren't static solar panels cheaper and easier in hte long run?
11:44 SolarNRG Solar panels DIE in the long run
12:07 Tom_itx they need to be balanced
12:07 Tom_itx sunny spots and shade cause imbalance in the output
12:10 SolarNRG Uv degredation
12:16 katsmeow-afk water leaking in
12:21 SolarNRG Katsmeow yeah, that tends to screw up pv systems pretty bad
12:21 SolarNRG Even the silicon sealant dies eventually
12:21 SolarNRG even epoy
12:21 SolarNRG epxoy
12:21 SolarNRG epoxy resin got there in the end
12:24 katsmeow-afk and, that resin can cost more than the pv
12:30 SolarNRG No shit!
12:30 SolarNRG You can get it a bit cheaper when you buy in two bottles as opposed to commercial araldite
12:35 katsmeow-afk i bought some cells once, the owner manual said to not use them outside, because the sun and weather would damage them
12:35 SolarNRG My mirrors are FINE outside :)
12:36 SolarNRG Hence why I like the parabolic mirror approach
12:36 SolarNRG Have you seen any of my videos?
12:38 katsmeow-afk only the failed nukebox ones, and a couple mirror ones
12:46 katsmeow-afk woah, now there's a logic level shifter : http://www.fairchildsemi.com/ds/FA/FAN7171_F085.pdf ;;;; drive it with 3.3 or 5v logic, and it's output can directly sink or source 3amp mosfet gate current pulses up to 500volts
12:47 katsmeow-afk and it's a lil sop-8
12:48 katsmeow-afk something hasto be wrong with that
12:49 katsmeow-afk ahhh, there is something wrong, they lied
12:49 katsmeow-afk the chip's outputs swing only 25v
12:50 katsmeow-afk if you want to swing 500v, you need to drive an open collector grounded emitter, or similar in mosfet-speak, and current source pullup to the 500v rail
12:50 katsmeow-afk they lied
12:56 katsmeow-afk but 3amp peak drive beats using a LM386 as a mosfet driver
13:15 katsmeow-afk why is it now 1:06pm ?
13:16 tsmeow-afk tries to go do things
14:35 SolarNRG Here is my latest video, be the first to see it, titled "How to make your own microwavable crucible for smelting metals at home" http://www.youtube.com/watch?v=DN8fQoXRyNM
14:35 SolarNRG Enjoy!
14:37 Steffanx smelting = smell + melting?
14:37 SolarNRG Yeah sure
14:37 SolarNRG LOL
14:37 SolarNRG It can be a smelly business 4 real!
14:37 Squint does that mean it's actually working now?
14:38 Steffanx And did you have any melted aluminium yet?
14:38 SolarNRG I have highly oxidized aluminium crisps, does that count?
14:39 Squint only if your video is titled "how to make you own microwavable crucible for oxidizing metals at home"
14:39 SolarNRG I'm getting some zinc powder
14:39 SolarNRG I'm going to try with that
14:39 SolarNRG However I have been warned NOT to get any on my skin as it sticks like buggery
15:30 katsmeow-afk smelt is a kind of fish
15:31 tsmeow-afk doesn't participate in bug
18:25 home so
18:25 home I took apart a cordless motor drill
18:27 home 12V motor XD
18:27 orlok nice
18:27 orlok does it have a clutch?
18:27 orlok the "torque control"
18:28 home found this motor http://www.hongyangmotor.com/En/ProductView.asp?id=143&class=7
18:28 home I can make the motor change directions
18:28 home with the switch thingy
18:29 home 7.2-24V Dc 10A something
18:29 home maybe fuse?
18:31 home not sure :/
18:32 katsmeow-afk you took it apart for why? you can make it reverse directions, so it runs, but you need a fuse?
18:33 home yes it has a clutch
18:33 home katsmeow-afk: nvm xD
18:33 home so hmm
18:33 home this controller thing..urggh
18:35 katsmeow-afk i've never seen a motor company describe their stuff as "having no hair or similar growth; smooth"
18:36 katsmeow-afk how do you buy from hongyangmotor.com ?
18:37 home who knows.. lol
18:37 katsmeow-afk so when you say you found a motor there,,,,,,, it means nothing?
18:38 home uhmm
18:38 home that means, the motor I have and its specs is there
18:38 katsmeow-afk o
18:44 orlok cordless drill motor, likely draws 10A+
18:45 orlok home: you want it simple on/off, or with variable speed?
18:45 home uhmm there is something on the controller
18:46 home what do you mean by variable speed btw? different speeds for motor?
18:46 orlok you know how the trigger works? pull it a bit and its slow, fast if you pull all the way?
18:47 home probably, I need to charge the battery before to test it.. but that seems to be it
18:56 home there is something on the controller
18:56 home 6 inputs
18:57 home while 2o f the inputs are being used
20:09 rue_house orlok, not HV ones, 18V will not be so much current
20:10 Tom_itx ok, almost ready to cook some boards
20:13 SolarNRG Tom can you cook me a stepper motor control board for a NEMA 34?
20:13 Tom_itx maybe you can microwave one
20:13 rue_house SolarNRG, can I hlep you make a window winder servo?
20:16 SolarNRG My research with microwaves show that only water, silicon carbide and magnetite are GOOD at turning microwave energy into heat
20:19 SolarNRG I really need a board that can handle the amps.
20:19 SolarNRG My prototype board's copper tracks are too thin
20:28 rue_house you used 1 thoug didnn't you?
20:28 rue_house :)
20:28 rue_house oh the protoboard, heh yea
20:29 rue_house SolarNRG, so, shall we make you a winder servo?
20:30 rue_house guess not
20:30 rue_house :/
20:30 e_house goes back to his
20:37 SolarNRG You mean a control board for my windscreen wiper motor?
20:37 SolarNRG I halfway built one
20:37 SolarNRG Then I sort of gave up because the TIPs were different from teh resistors in teh guide
20:38 SolarNRG And I'm too thick to do the math on how to find out the right resistor
20:38 SolarNRG And the prototype board's epoxy resin was still sticky
20:38 SolarNRG I've still got it
20:38 SolarNRG But never tested it
20:38 SolarNRG In case it blew up my power supply
20:38 SolarNRG I could rewire the motor to go forwards then rewire it to go backwards
20:38 SolarNRG That's about it
20:41 rue_house SolarNRG, we can help you with all that
20:41 rue_house tell me about what you have
20:41 SolarNRG I'll photo it, it
20:42 ace4016 sounds like you also need an H-bridge
20:42 SolarNRG 's easier
20:45 SolarNRG Heres one pic of my h bridge http://i.imgur.com/YEHjH.jpg
20:45 SolarNRG Here's the other http://i.imgur.com/Qi5Dr.jpg
20:45 rue_house do you have a link to the schematic you were using?
20:45 ace4016 took a picture of that in the sun?
20:46 rue_house thats looking ok
20:46 rue_house could you tell me the part numbers on the transistors?
20:46 SolarNRG http://www.bobblick.com/techref/projects/hbridge/hbridge.html
20:46 rue_house maybe brown/brown to brown/blue
20:46 SolarNRG Tip 125s and TIP 120s
20:47 SolarNRG the smaller ones are PN2222's
20:47 rue_house from the one with brown and brown, what are the part numbers
20:48 SolarNRG brown brown TIP3055 sorry
20:48 rue_house ok next to that?
20:48 SolarNRG brown blues are tip 2955's
20:49 rue_house so, froim the side with the connector strip its, 3055, 2055, 2955 2955 ?
20:49 SolarNRG 3055, 3055, 2955, 2955 actually yeah
20:49 SolarNRG Two npn two pnp BJT
20:49 SolarNRG s
20:49 SolarNRG Never tested it
20:49 rue_house ok , give me a sec
20:50 SolarNRG The big wire is soldered straight onto the backs of the transistors
20:50 rue_house good
20:50 SolarNRG The other terminals are cut
20:50 SolarNRG Only the collectors go to the pn2222's outputs
20:50 SolarNRG I got confused how a b and gnd go to the arduino
20:50 SolarNRG I didn't want to fry my atmega
20:51 rue_house 3055 is NPN 15A with a gain of 5
20:51 SolarNRG yep
20:51 rue_house SolarNRG, pls wait a sec
20:52 rue_house 2955 is PNP, matched
20:52 rue_house pinout is B C E
20:54 rue_house connector > 3055, 3055, 2955, 2955
20:55 rue_house so the lug closest to the transistors is collector of 3055 and collector of the 2955, so thats ... not right
20:56 SolarNRG Thought not
20:56 rue_house well according to that silly circuit it is, but ..
20:56 rue_house dear god, that one will blow up on you...
20:56 rue_house k, please hold
20:56 rue_house so first lug is motor output 1
20:57 SolarNRG "lug"
20:57 SolarNRG ?
20:57 rue_house next is motor output 2
20:57 rue_house 3rd lug is disconnector, but goes to emitters of the npn, so thats -
20:58 rue_house bl;ues are the emitters of the pnp, so those are +
20:58 rue_house k
20:58 rue_house now for some math, 15A /5 is 3A
20:59 SolarNRG Why 15A/5!?
20:59 rue_house the 2222 are only rated for 500mA so the best you can get out of the bridge would be 500*5 = 1.5A
20:59 rue_house worst case gain is 5 on those transistors
20:59 rue_house the TIP120 are nice cause the gain is 1500
20:59 rue_house however, lets work with what you have
20:59 e_house th
21:00 SolarNRG I tell a lie, they are 2n3904's not PN2222;s
21:00 rue_house SolarNRG, do you have any computer pwoer supplies you can strip for parts?
21:00 SolarNRG ITs all maplins had
21:00 SolarNRG I have a working power supply, I turn it on, the windscreen wiper motor goes whizz whizz
21:00 rue_house ok, I want some you can pull transistors out of
21:01 rue_house or 12V to (whatever your mains voltage is) volts
21:01 rue_house inverters
21:01 SolarNRG I got a box of transistors
21:01 SolarNRG I have some darlington ULN2003 chips
21:01 rue_house tell me the part numbers
21:01 SolarNRG Any good?
21:01 rue_house 2003 is 500mA
21:01 rue_house we need eithr a 8A transistor with a higher gain, or a transistor 3A or more we can drive your big ones with
21:02 SolarNRG So I need bigger transistors, but not as big as the TIP3055 and TIP2955's? Is that it?
21:02 SolarNRG Let me have a look in my magic box
21:02 rue_house we need bigger than the 2222 / 3904
21:03 SolarNRG i got l7m12cvs
21:03 SolarNRG any good?
21:04 rue_house L7m?
21:04 SolarNRG l70m112cv
21:05 rue_house cant find any existandce of that part number
21:05 SolarNRG l70512cv
21:05 rue_house hows is broken into lines on the transistor?
21:05 SolarNRG l78s12cv
21:06 rue_house the 7812 is a 12V regulator
21:06 SolarNRG lm340ts
21:06 SolarNRG Those are all the bigger transistors I got
21:06 rue_house lm340 is also a regulator
21:06 rue_house I think their all regualtors
21:07 SolarNRG dc to dc converters?
21:07 rue_house no voltage regulators
21:07 SolarNRG ??
21:07 SolarNRG Useful for signals then
21:07 rue_house if you put 14 to 40V into the 7812, you will get 12V out
21:07 furrywolf SolarNRG: are you familiar with outback's mx60 by any chance?
21:07 SolarNRG no
21:08 SolarNRG what's an mx60?
21:08 furrywolf ... you don't actually do anyything with solar, do you? :)
21:08 rue_house SolarNRG, can you get any stuffed pc supplies to take to parts?
21:08 rue_house furrywolf, he does, its just home brew so far
21:08 SolarNRG Actually I do, here's my video http://www.youtube.com/watch?v=NaL-OyhwD6o
21:08 furrywolf the mx60 is one of their maximum power point tracking charge controllers, and one of their best-selling products worldwide.
21:09 rue_house furrywolf, he does, its just home brew so far
21:09 furrywolf I'm not going to deal with youtube for something that should be text.
21:09 rue_house SolarNRG, can you get any stuffed pc supplies to take to parts?
21:09 SolarNRG a picture says a thousand words and a video says a thousand pictures
21:09 SolarNRG stuffed pc supplies?
21:09 rue_house maybe my australlian is off
21:09 SolarNRG What like my old graphics card?
21:10 SolarNRG You're australian?
21:10 furrywolf not really. many things are much, much better as text.
21:10 furrywolf SolarNRG: power supplies.
21:10 rue_house can you get broken pc power supplies to take apart?
21:10 SolarNRG There's a shop that fixes computers, I can ask in the morning
21:10 rue_house ok
21:10 rue_house see if you can get 4 or 5 dead power supplies
21:10 SolarNRG 4 or 5?
21:10 rue_house yes
21:10 SolarNRG Might be a skip job
21:10 SolarNRG Any reason?
21:10 rue_house they have the parts you need
21:11 rue_house 4 or 5 cause some types dont have the parts you want
21:11 rue_house if you have a variety the odds of getting what you want is higher
21:11 SolarNRG Is it because of the ON transistor thing in the power supplies and I need 4 of them to go on + to terminal 1, on terminal 2 to ground. And in reverse, On + to terminal 2 and on terminal 1 to gnd?
21:11 SolarNRG Is that it?
21:11 SolarNRG And the circuitry is already there
21:12 rue_house no, you need 2 good transistors, which youd be having a really bad day to not get from 4 or 5 supplies
21:12 SolarNRG Couldn't I just order them online?
21:12 rue_house well it'd take longer and cost more, and if it all goes wrong your gonna be more frustrated, and its not recycling
21:13 rue_house but yes, want me to get you some part numbers?
21:13 SolarNRG Part numbers and a plain lego/kindergarten egg style assembly manual would be nice
21:13 SolarNRG So I know what connects to where and I don't get the wrong pin in the wrong hole
21:13 rue_house I'd rather walk you thru it and use the irc log to make the howto
21:14 SolarNRG skype video feed?
21:14 rue_house EVERY time I do all that work for someone, they dont follow it
21:14 rue_house they give up, and all my effort is wasted
21:14 SolarNRG video's easier cos you can see and say "not that pin"
21:14 rue_house so I basically do it as a 'I'll match your time on it' interactive thing
21:15 SolarNRG It's 3:00am here
21:15 furrywolf ... you seem to like video. I hate video. :P
21:15 rue_house video if you like, but its not hard to do thru images
21:15 SolarNRG Images is adequate
21:15 rue_house well
21:15 rue_house phone...
21:15 SolarNRG Are you online tomorrow?
21:15 SolarNRG Skype, its cheaper and you can see my webcam feed
21:16 SolarNRG Add me
21:16 SolarNRG I'll have some parts tomorrow
21:16 SolarNRG Just give me a shopping list for now
21:16 SolarNRG My skype username is: alistairsmith84
21:16 SolarNRG add me
21:17 SolarNRG I got an HD webcam and a lamp
21:18 SolarNRG I even have BLUE-TAC to hold the webcam in awkward angles
21:18 SolarNRG I'm off to bed anyway
21:18 SolarNRG THanks for your help, we'll finish this tomorrow
21:19 furrywolf gah... can't...stand....spoon...feeding...
23:13 rue_house oh
23:14 rue_house I decided to inhabit my livingroom for a while and found something I havn't seen in a long time
23:14 rue_house THE FLOOR
23:41 tsmeow-afk took a short nap at 7pm and then someone redefined "sh
23:44 katsmeow-afk <cough>