#robotics Logs
Nov 04 2012
#robotics Calendar
13:18 rue_house and usb hubs, about 4
13:18 rue_house see which ones arrive
13:18 rue_house the drugstore wanted $54 for a usb hub, I bought 4 or 5 on ebay and I dont think they amounted to more than $25
13:19 rue_house another set of digital calipers
13:23 Tom_itx what kind?
14:04 rue_house http://www.ebay.ca/itm/280964536542?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
14:04 rue_house I paid just as much here for the set I have
14:06 Tom_itx i got a B&S set
14:06 Tom_itx i think
14:06 Tom_itx maybe Fowler
14:06 Tom_itx but they were more than that
14:07 Tom_itx price a 12" pair :D
14:08 Tom_itx heck, they're actually not that much more
14:12 rue_house I think $20 is an awesome deal for those
14:13 rue_house esp since there is a serial port you can use them for absolute positioning sensors
14:13 Tom_itx yeah
14:13 Tom_itx mine has a port but i never tried to use it
14:13 rue_house I looked at mine, and have remmebered its there :)
14:13 Tom_itx not sure what the protocol is on it
14:14 rue_house the had article says
14:14 Tom_itx i've had em for years
14:14 Tom_itx they were somewhat new when i got mine
14:15 Tom_itx most were dial
14:15 rue_house I cant find a cheap analog meter on ebay
14:16 Tom_itx you likin the usb programmer?
14:16 rue_house I'v used it 3 times now, its great
14:17 Tom_itx makes it more portable nowdays
14:17 Tom_itx you could add a couple leds to it
14:17 Tom_itx for usb ready and busy
14:17 rue_house I'm gonna just work on the motor sequencer for the reprap
14:17 Tom_itx it's what i use the bicolor led for
14:18 Tom_itx PB5 PB6
14:18 Tom_itx anode
14:18 Tom_itx cathode to gnd
14:20 rue_house ah, there are some out there now
14:20 rue_house analog multimeters start on ebay at about $7
14:20 rue_house go up to $15 really fast
14:21 Tom_itx why do you need analog?
14:21 rue_house the shop needs a 5-20mA 0-10V signal IO for working on control equip
14:21 rue_house the meter makes a nice package
14:22 rue_house then again, it might not be hard to find a battery-packed project box
14:22 rue_house I was gonna just gut a meter
14:22 Tom_itx i got an old rs analog meter somewhere
14:23 Tom_itx the local guy has a few analog meters on the shelf still
14:23 Tom_itx bare meters
14:23 rue_house the tire shop wants like $40 for el cheapo analog meter
14:23 rue_house panel meters are cheap, $4
14:24 rue_house http://www.ebay.ca/itm/1-Plastic-Electronic-Project-Box-G858G-O-BC-AA-battery-/140513937099?pt=US_Pro_Audio_Parts_Accessories&hash=item20b74886cb
14:24 rue_house :)
14:24 rue_house its calling you tom
14:24 rue_house http://www.ebay.ca/itm/Smart-Robot-Car-Kits-with-Battery-Box-for-your-project-/270970067700?pt=LH_DefaultDomain_0&hash=item3f17131af4
14:24 Tom_itx hammond will give you free samples
14:25 rue_house $27??????????? seriously?
14:25 Tom_itx they have handhelds like that
14:26 Tom_itx pololu has a new hbridge stepper driver out now
14:26 rue_house ? hammond?
14:26 Tom_itx 45v
14:26 Tom_itx http://www.hammondmfg.com/
14:26 Tom_itx http://www.hammondmfg.com/R270.htm
14:27 Tom_itx http://www.hammondmfg.com/1553.htm
14:27 Tom_itx i got one similar to that free
14:27 Tom_itx 2 different sizes
14:27 rue_house I'm looking for something with a battery compartment
14:27 rue_house oh
14:27 Tom_itx http://www.hammondmfg.com/1553T.htm
14:27 Tom_itx here
14:28 Tom_itx there
14:28 rue_house huh
14:28 rue_house they do
14:28 Tom_itx i bet they'd sample you one
14:28 Tom_itx http://www.hammondmfg.com/dwg7.htm
14:28 Tom_itx closer to the ebay one
14:31 Tom_itx http://www.hammondmfg.com/dwg8TBU.htm
14:31 Tom_itx 1593 STBU and 1593 NTBU is what they sent me
14:32 rue_house hmm
14:32 Tom_itx and a couple of the ones i used on the programmer
14:32 Tom_itx different thicknesses
14:34 Tom_itx the translucent is nice for showing leds thru it
14:34 Tom_itx frosted finish
14:35 Tom_itx digikey and mouser sell em
14:39 rue_house hmm
14:40 rue_house I dont know if I want to make one for me
14:40 rue_house I dont want to make one for work
14:40 Tom_itx what's it for?
14:41 rue_house checking sensors, testing VFD's etc etc
14:42 rue_house I have something I threw togethor on a breadboard last time we needed somethign
14:42 rue_house http://www.ebay.ca/itm/Honeywell-Resistor-4-20ma-30754466-501-13773-/300316260861?pt=LH_DefaultDomain_0&hash=item45ec3e79fd
14:43 Tom_itx http://www.pololu.com/catalog/product/2132
14:43 rue_house hahahahahahahahaha
14:43 Tom_itx their new driver
14:43 rue_house I'm not paying $20ea for stepper motor drivers
14:43 rue_house I wont even pay $10
14:43 Tom_itx me either but it gives me a pn for a chip
14:44 rue_house the chips are prolly not that much cheaper
14:44 rue_house or their collecting on reprap people rushing to upgrade to the newest-latest
14:46 Tom_itx http://www.mouser.com/ProductDetail/Texas-Instruments/DRV8825PWP/?qs=sGAEpiMZZMvYvv22R2xfeNNdai1s%2f42dCcf9NmxxVHk%3d
14:46 Tom_itx there's one from TI
14:52 rue_house 32 microsteps
14:52 rue_house I wonder what the typical truesine inverter has
14:53 Tom_itx mine do 10
14:53 Tom_itx and work great
14:53 Tom_itx i doubt you get much advantage beyond that
14:53 rue_house I'm going to use half or full stepping for testing the reprap, I can redo the drivers I have to whatever I want
14:54 Tom_itx marlin may do microstepping in software
14:54 Tom_itx did you look?
14:54 rue_house Triffid_Hunter, said the main diff is noise
14:54 rue_house it cant, it just outputs step/dir
14:54 Tom_itx true
14:54 rue_house I'm ok doing it this way
14:54 rue_house I have some great drivers
14:55 Tom_itx my old ones don't do microstepping that i know of
14:55 Tom_itx i don't know what they are
14:55 Tom_itx sealed units
14:56 Tom_itx they served their purpose for quite a few years for me
14:56 rue_house mine are also unipolar motors, so I have to think a bit about how the microstepping goes
14:56 rue_house or maybe I already did
14:56 Tom_itx the new ones are 10x better though
14:56 Tom_itx less power
14:56 Tom_itx unipolar
14:56 rue_house yes and no
14:57 rue_house I THINK you can reverse the polarity on the second half of the coil
14:57 rue_house but I dont care
14:57 rue_house as far as I'm concerned
14:57 rue_house the motor sizing on the reprap is stupid, if they need that much power they should be using nema23's
14:58 Tom_itx i think voltage has as much to do with it as microsteps and probably more
14:58 Tom_itx yeah
14:58 Tom_itx those little 17's aren't that bad though
14:58 rue_house I want to make a nema23 machine as one of the first 3 projects
14:58 Tom_itx http://www.robosprout.com/motors/stepper-motors.html
14:58 Tom_itx that's what alot of em are using
14:59 Tom_itx 78oz in
14:59 rue_house yes
14:59 Tom_itx my first nema23's were 135
14:59 Tom_itx which is what i'll use if i do anything
15:00 Tom_itx at least for x and y
15:06 rue_house ok state machine step table...
15:06 rue_house done this a million times...
15:07 rue_house ok, what step seq to use...
15:08 rue_house 1001
15:08 rue_house 1010
15:08 rue_house 0110
15:08 rue_house 0101
15:08 rue_house cycle
15:09 rue_house 2 bit table
15:10 rue_house grey
15:10 rue_house 00
15:10 rue_house 01
15:10 rue_house 11
15:10 rue_house 10
15:10 rue_house 1, 3, 0, 2
15:12 rue_house motor = steptable[motor];
15:13 rue_house reverse
15:13 rue_house 00
15:13 rue_house 10
15:13 rue_house 11
15:13 rue_house 01
15:14 rue_house its not the forward table
15:15 rue_house if (!dir) motor~=motor;
15:15 rue_house no, the result
15:15 rue_house yea, put after the lookup
15:15 rue_house &3
15:39 rue_house hmm 330R is kinda bright
15:39 rue_house how many amps from the usb port is this U2 board good for? :)
15:41 Tom_itx 100 but 500ma if you request more iirc
15:41 Tom_itx or is it 400ma
15:41 Tom_itx i forget
15:41 rue_house yay, it makes motor stepping light sequences
16:09 Tom_itx trying to mod old code
16:24 DarkPeak hey guys
16:28 home DarkPeak: hey
16:28 DarkPeak Just wanted to introduce myself.
16:28 DarkPeak I just started as a postgrad in robotics
17:19 rue_house hey
17:25 rue_house gone!
17:25 orlok on saturday i managed to have a look at the house i bought
17:25 rue_house er
17:25 rue_house you bought it, then looked at it?
17:25 orlok yup
17:25 rue_house thats the signiture of a scammer you know
17:26 orlok nah, my GF went and had a look at it first
17:26 rue_house "send me money and you will own this house!"
17:26 rue_house ah
17:26 orlok it was open for inspection last saturday, but we missed it, she maaged to get a look on the monday
17:26 rue_house your just trying to get out of arguments about it
17:26 orlok and then said "Its perfect" , and.. she's pickier than me
17:26 rue_house yea
17:27 orlok it has a big double garage/shed
17:27 orlok like, enough room to fit two cars and still work around them
17:27 rue_house she wants a place thats perfect, you just want a roof, if it weren't for the ladies we would still be happily living in caves :)
17:27 orlok concrete floor and power
17:27 orlok and theres a metal workshop attached to the back of that
17:27 rue_house col
17:27 orlok concrete floow, power
17:27 rue_house coooool
17:28 orlok so an internal doorway between the two and door to the outside from the workshop
17:28 orlok and attached to the back of the workshop is a woodstore
17:28 orlok for the "Coonara"
17:29 orlok which is i think a "Aussie" style of woodheater
17:29 orlok i had to google it
17:29 orlok its like a fully enclosed pot belly stove with fan forced heat extraction?
17:29 Jak_o_Shadows i've never seen a woodheater which isn't fully enclosed
17:30 orlok Jak_o_Shadows: well, its not a fireplace
17:30 orlok i have never lived in a place with one before
17:31 orlok anyway, i'm pondering putting in a pillar inside the workshop and putting a dome on top, hahaha
17:31 rue_house you people build your places crazy up there
17:31 rue_house if you saw the way we build, you would think it was -40c here all year round
17:31 orlok yeah, i've been over there once before, underground shopping centers!
17:32 rue_house is & or && bitwise and?
17:32 rue_house &
17:32 Jak_o_Shadows Um, orlok that looks like a normal woodheater. Admittedly a fancy looking one with a huge glass, but yeah.
17:32 Jak_o_Shadows What, people have open fires/
17:33 rue_house looking a leds counting in grey, its really hard to tell if its going up or down
17:34 rue_house ok , this is going quite well
17:34 Tom_itx rue_house seems to be having a good day
17:34 rue_house ma came by and ordered $60 of beads from china off ebay
17:35 rue_house she loves internet and is glad she dosn't have a computer
17:35 Tom_itx heh
17:35 rue_house void stepMotor1(unsigned char dir) {
17:35 rue_house static char index = 0;
17:35 rue_house index = steptable[index];
17:35 rue_house if (dir) index = (~index & 3);
17:35 rue_house PORTA = cheat[index];
17:35 rue_house }
17:35 rue_house I need to double buffer the port changes....
17:37 rue_house !seen katsmeow-afk
17:37 tobbor katsmeow-afk was last seen in #robotics on Oct 30 15:52 2012
17:37 rue_house I wanted to write a self-modifying program, b.f. would be a perfect language but it cant self-modify
17:38 rue_house I think I have to use ASM
17:39 rue_house ok tere is gonna be a power outage soon, I better get some stuff ready
22:26 orlok thats better!
22:26 DagoRed How's it goin?!?!
22:34 rue_house slow
22:35 DagoRed hey rue_house!
22:35 DagoRed Is your furnace up and running for the winter?
22:35 rue_house its still too warm out
22:37 DagoRed Ahh