#robotics Logs

Feb 03 2012

00:10 dumbass no
00:10 rue_mohr ?
00:10 dumbass you need something higher freq, somehting that xmits periodically not constantly, and xmits code to determine which cat is which
00:11 rue_mohr so I shoudl use a 556?
00:12 dumbass i's use a lowpower avr, use it's osc as the xmit freq too, and if you use 49Mhz, or 24.5Mhz with a doubler, you can use cb handitalkis as recievers
00:12 dumbass if the cats can feel the weight, it will rub their fur off and cause skin irritations
00:13 dumbass so it hasto run off a Lion coin
00:13 rue_mohr just put it on when they go out
00:13 rue_mohr so far its TINY
00:13 dumbass burp a id code once a minute
00:13 rue_mohr but its uspposed to be a locator
00:13 dumbass how you'll direction find it, i dunno
00:13 rue_mohr you cant look for a stronger signal when you only get 1 burp/min
00:13 rue_mohr bar graph
00:14 rue_mohr http://eds.dyndns.org/~ircjunk/circuits/car-locator.jpg
00:14 dumbass but if the batetry goes dead, or you spend $1698/yr on batteries that anchor the cat to the ground so it cannot move, you'll quit using it
00:15 dumbass rue, if you had installed the system for the mowerbot like i suggested, you could use it to locate the burps
00:15 rue_mohr the burried wire fences?
00:15 dumbass no
00:15 dumbass a local custom gps system
00:16 dumbass youo can make it FAR more accurate than the satalite gps systems
00:16 rue_mohr I dont know how to build that
00:17 rue_mohr if this is ~2Mhz, why not just use a crystal osc module?
00:17 dumbass too bad i am a dumbass, i could help you, specially since i now have 4 acres that need mowing
00:17 dumbass 2Mhz if a large antenna
00:17 rue_mohr and why didn't they choke the line to the 555
00:18 e_mohr scratches his
00:18 dumbass higher the freq, the smaller than antenna can be for the same radiated power
00:18 dumbass or ERP
00:18 rue_mohr its an old school circuit, the reciever uses two 9V
00:19 rue_mohr bet I could throw a max232 in there and use 1 9V
00:32 dumbass i'll bet the cats will not go walkabout with a 9v battery around their neck
00:32 dumbass or 2 of them
01:07 dumbass so if a black hole appears to be nothing, and one openes right in front of you, would you call 911 to report that there was nothing in front of you?
01:11 dumbass <911> so why are you upset? <caller> [screaming in terror] THERE'S NOTHING RIGHT HERE!!!
01:32 theBear rofl
01:33 theBear probly more like "There's nothing here and it's sucking everything in and turning it into more nothing with infinite density !!!!!!"
01:35 dumbass <caller> my dog went over where nothing is, and he's not over there now too!
01:35 theBear hehe
01:36 theBear <911> see what happens when you send the cat over
01:36 dumbass <caller> the cat left!
01:36 theBear <911> heh, what a pussy <laughs>
01:37 dumbass erg
01:37 theBear <911> sorry sir, just trying to lighten the mood
01:52 joink depends a bit
01:52 joink I guess you would see an imprint of them on the event horizon
01:52 joink but dunno how big that would be
02:09 theBear been a long time since i read anything by the wheelchair dude, but i thought they just kinda sucked into nothing... how you gonna see an imprint on light that isn't travelling towards you ?
04:12 TheLegace hi anyone around?
04:20 theBear no
04:20 theBear go away :)
04:22 theBear cheer up, whaddya need ?
04:27 TheLegace hey
04:28 TheLegace theBear, i needed a tiny bit of help with transformation matrices
04:28 theBear oooh, yer talking to the wrong dude, i'm terrible with anything involving matrices
04:28 TheLegace okie
04:28 TheLegace i think i figured it out though
04:28 TheLegace i guess ill ask my prof
04:28 TheLegace thanks though
04:28 theBear unless it's just algebra dressed up as matrices, but right now i GOTTA break away from the computer
04:29 theBear you can try ##electronics if it's a digital matrix, more likely to find it here or prof if it's a physical thing
07:00 dumbass this if a heck of a nick as ebay seller: "potomacescrap" ,, wth is "poto maces crap" ?
08:51 rue_mohr potom ace scrap?
08:56 rue_mohr how baout P. O. Tomace scrap
08:58 dumbass "pot o' mace scrap" ?
08:58 dumbass "pot o' maces crap" ?
08:59 dumbass "potomac e-scrap" ?
09:22 dumbass http://www.bbc.co.uk/news/world-us-canada-16875921
09:25 dumbass http://www.bbc.co.uk/news/technology-16812064
19:46 rue_mohr found the cat
19:46 rue_mohr up the neighbours neighbours tree
19:46 rue_mohr got him down, now the first cat is missing
19:52 Tom_itx you should tie a string between them to their tails
19:53 rue_mohr got her, I have two again
19:53 Tom_itx i posted pics of the revs i've done on my programmer since i started
19:54 rue_mohr ah yes
19:54 Tom_itx http://tom-itx.dyndns.org:81/~webpage/boards/USBTiny_Mkii/USBTiny_Mkii_index.php
19:54 Tom_itx just under the top 2 pics
20:12 rue_mohr cool
20:13 rue_mohr is it mostly part tweeks
20:13 rue_mohr ?
20:13 Tom_itx yeah
20:14 Tom_itx the rpacks were pulled since he enabled internal pullups which worked out better anyway
20:14 Tom_itx then just a hunt for cheaper parts etc
20:14 Tom_itx i could redesign it and make it smaller but it's kinda taken on a shape now :)
20:15 rue_mohr c6 could come down a bunch
20:16 rue_mohr bring d2 down and turn r1...
20:16 Tom_itx i could probably cut 1/3 out of the board size
20:16 Tom_itx but i'll probably leave it alone
20:16 rue_mohr :)
20:16 rue_mohr I have to etch a few temp sensor boards, try out the new tank
20:16 Tom_itx it's been a fun and profitable project
20:16 rue_mohr see if the etchant is still any good
20:16 rue_mohr always seems to go bad between batches
20:16 Tom_itx yeah i hate that
20:17 rue_mohr Tom_itx, all of about $10 now I presume?
20:17 rue_mohr :)
20:17 Tom_itx considering Ca prices yeah
20:17 Tom_itx :)
20:18 Tom_itx you gotta get reasonable quantities though
20:18 rue_mohr that reminds me, I have a new oven to finish too
20:25 Tom_itx rue_mohr, leaving the components the same direction helps with assembly too
20:25 rue_mohr your just trying to not have to make a new solder mask
20:26 Tom_itx well considering i just got 100 boards and 2 new masks... no
20:26 rue_mohr do you know what the top/bottom heating ratio is on official reflow ovens?
20:26 Tom_itx yeah, i used to have a profile somewhere
20:27 Tom_itx kat could show you one.. she's pasted them in the past
20:27 rue_mohr no I mean for the amount of heat on top vs bottom
20:27 Tom_itx oh i dunno
20:27 rue_mohr I have a thermal profile from a chip I stuck in the thermal controller
20:27 rue_mohr I think they apply more bottom heat
20:27 Tom_itx my sensor is in the middle of the oven
20:27 Tom_itx my elements heat the same top and bottom
20:28 rue_mohr I should make a little peice of board with a sensor on it
20:28 Tom_itx sensor is about board height
20:28 rue_mohr how long to not get melted connectors?
20:28 Tom_itx http://tom-itx.dyndns.org:81/~webpage/toaster_oven/sensor3.jpg
20:28 Tom_itx use silver solder
20:28 Tom_itx for a bit higher melting point
20:29 Tom_itx i used red rtv to hold it on
20:29 Tom_itx the tape is just till that set up
20:30 Tom_itx then i used that high temp braided tubing to cover the wires
20:30 rue_mohr its in a hole?
20:30 Tom_itx yes
20:30 rue_mohr I have a 6" thermocouple
20:30 Tom_itx http://tom-itx.dyndns.org:81/~webpage/toaster_oven/sensor1.jpg
20:31 Tom_itx i used a short piece of the braid there too
20:32 Tom_itx got it from a local motor rewind shop
20:32 Tom_itx by the foot
20:32 Tom_itx http://tom-itx.dyndns.org:81/~webpage/toaster_oven/control_mounted1.jpg
20:32 Tom_itx the white stuff you see there
20:33 Tom_itx the insul i added and covered with tin made the biggest difference
20:33 Tom_itx i can touch the top of it while it's on
20:33 Tom_itx i used the original timer as the main on off switch
20:34 rue_mohr hmm I should write a profile program
20:36 rue_mohr I could use almost hte same software as my oscope program
20:45 Tom_L http://www.intersil.com/pbfree/Pb-FreeReflow.asp
20:47 rue_mohr k
20:47 Tom_L lead free
20:47 Tom_L but i have one for lead here somewhere
20:48 rue_mohr I have to work out what shte kids are doin tommorow
20:48 rue_mohr I got more than one now I have to get back on the ball
20:48 rue_mohr the new one knows BASIC, so I'm working with that
20:48 Tom_L http://www.abracon.com/Support/reflow_profile.pdf
20:48 rue_mohr get him good with binary and such
20:49 Tom_L i still got those other bitbanged usb programmers if you feel any are worth it
20:49 Tom_L they're just sitting here
20:50 rue_mohr I'm ok for now
20:50 Tom_L mine goes to 235c
20:51 rue_mohr thats it?
20:51 Tom_L whole cycle is about 8 min
20:51 Tom_L yep
20:51 rue_mohr all pb free?
20:51 Tom_L slow ramp to bake of moisture
20:51 Tom_L no
20:51 Tom_L lead
20:51 rue_mohr huh
20:51 rue_mohr accoring to this, lead needs more heat
20:51 Tom_L follow that bottom table in the last link
20:51 Tom_L nope
20:52 Tom_L not that stuff from DX anyway
20:52 rue_mohr erp, wrong way :)
20:52 Tom_L free takes more temp
20:53 rue_mohr I wonder if my bench function genorators can be mixed to get a ramp
20:53 Tom_L the code is on my site for mine i tink
20:53 rue_mohr I have an serial industrial temp controller
20:53 rue_mohr two actaully
20:53 Tom_L iknow
20:54 rue_mohr I can make a 'draw-a-thermal-profile'
20:54 Tom_L i wanted to make a menu to select a few different ones
20:56 rue_mohr oh oh oh oh I also have a library for abstracting between data points...
20:56 rue_mohr with linear interpolation
20:58 rue_mohr vect.c
20:58 rue_mohr huh
20:59 rue_mohr looks like its a library I'v never actaully used
21:08 rue_mohr the quadcopter swarm on hackaday is pretty cool
21:18 Tom_itx you're becoming a regular there
21:19 mbass is becoming a regular dum
21:19 Tom_itx that's just one opinion
21:19 Tom_itx you are way out voted
21:19 dumbass wasn't my vote
21:22 rue_mohr ok , my digital scope code might be REALLY crashy, but I think it'll work
21:23 rue_mohr no wait, nothing makes it ASK for data...
21:25 dumbass nothing should
21:25 rue_mohr its a serial port, its a data-on-request system
21:25 dumbass it should be digitising from the time it's enabled, so you can ask "what was the waveform leading up tot he time the timebase module triggered?"
21:25 rue_mohr not at 19200 baud
21:26 dumbass sorry i said anything, i'm a dumbass
21:26 rue_mohr its a -> please give me a frame of the next triggered data <-- ok here it is
21:26 dumbass i've only used professional oscopes since ~1978
21:26 rue_mohr kat, do you know how I'd do that at 1920 cps?
21:26 dumbass i made my own audio scopes from tv sets before that
21:26 rue_mohr the adc runs up to 1Msps
21:27 rue_mohr yea, this is a cerry limited digital scope
21:27 rue_mohr its also verry limited
21:27 rue_mohr I'm gonna change the way it works, after I get it working
21:28 rue_mohr I'm just working on a basic foundation
21:29 rue_mohr the pc sends "." and the avr sends "[]" followed by 455 bytes of samples
21:30 rue_mohr later there will be frame information between the brackets
21:30 rue_mohr and different numbers of data bytes
21:30 rue_mohr maybe I should do it like a wav file, with the channels and depths
21:32 rue_mohr this will be an odd setup for the dirction I'm taking it
21:33 rue_mohr the hardware will control the sample rate, gain, and triggering, the pc just recieves and displays the data
21:34 rue_mohr I need to get an avr capturing and sending data, see if I can even get a realiable 19200 baud first...
21:35 Tom_itx 11.0592Mhz should get you 0% error
21:36 rue_mohr hmm wonder if I ahve one of those
21:36 Tom_itx http://www.wormfood.net/avrbaudcalc.php
21:36 rue_mohr yea
21:36 rue_mohr I think ruemohr.org accidently renewed
21:36 rue_mohr need to check my credit card
21:36 rue_mohr they are really trickey bastards
21:37 Tom_itx they get you hooked
21:37 rue_mohr they auto bill the card
21:37 rue_mohr they try to default you into a package upgrade
21:37 rue_mohr "if you dont reply we will upgrade you to the next most expensive plan"
21:38 rue_mohr how about 18.432Mhz
21:38 rue_mohr then I'm good to 115200
21:38 rue_mohr and I can start playing with ideas like kat was talking about
21:38 rue_mohr 11Khz continious sampling
21:39 rue_mohr its taking everything I got to stay awake
21:40 Tom_itx :/
21:45 rue_shop .
21:47 rue_shop 18.43Mhz
21:47 rue_shop that must be it
21:52 Tom_itx what's the chip good for?
22:06 rue_shop 20
23:03 dumbass 21.5
23:20 rue_shop yes, well +- overclocking always
23:20 rue_shop ok I just put a 10 turn on the freq gen, now I can get .1hz or more resolution
23:24 m_itx feels the sleep anchor around his neck draggin him
23:48 e_shop puts away the IF transformers he's been playing
23:48 rue_shop some of them were out of alignment
23:49 rue_shop one was as far as 430Khz
23:49 rue_shop its 445 now
23:49 rue_shop er 455
23:49 rue_shop hehe
23:50 rue_shop ok I'm supposed to prep for tommorow
23:50 e_shop looks around the disaster of a
23:53 dumbass for a broadband responce, you *want* the if transformers staggered 450-455-460
23:54 dumbass remember, AM is *amplitude* modulated, if all the if cans are peaked at 455, you'll have a nonlinear ressponce in the sidebands
23:55 dumbass for ssb, sure, set all the cans to 440 or whatever
23:55 rue_shop ..oh yea
23:56 rue_shop nowonder rf was never nice to me
23:57 dumbass on FM, you can set all the cans to 10.7 because the aplitude nonlinearity won't matter
23:58 mbass is such a useless waste of mate