#garfield Logs

Apr 13 2018

08:11 PM rue_mohr: << >> kat?
08:14 PM zhanx: not on
08:14 PM rue_mohr: ask me a printer question
08:14 PM zhanx: ok
08:14 PM zhanx: belt stretch? is that an issue
08:18 PM zhanx: i got clothes pins
08:40 PM rue_mohr: you dont need the belt to go all the way around
08:41 PM rue_mohr: just long enough to run the thing back and forth
08:41 PM zhanx: travel path
08:41 PM rue_mohr: did you set aside springs from the pritners?
08:41 PM zhanx: no should i have?
08:41 PM rue_mohr: I used fishing line and stuff for the rest
08:41 PM rue_mohr: did you see it ?
09:14 PM Tom_L: we just dropped a bomb on syria
09:14 PM zhanx: yep
09:15 PM zhanx: russia was warned ahead of time to prevent WWIII
09:35 PM katsmeow is now known as ^kat^-afk
09:43 PM rue_mohr: trump found out war is the only way to stabalize the american economy and make it so he can stay president even tho he's not voted for?
09:44 PM ^kat^-afk: corect
09:45 PM rue_mohr: kat!
09:45 PM ^kat^-afk: is Tom still on earth in an "alive" condition?
09:45 PM ^kat^-afk: rue!
09:45 PM rue_mohr: before the usa is bombed out of existance, I'd like you to help me
09:45 PM rue_mohr: but I cant remember for what
09:45 PM rue_mohr: OH RIGHT
09:45 PM ^kat^-afk: i think they'll hit Washi DC first
09:46 PM rue_mohr: ok, I have pages motors to operate flip-cards for a 7 segment display (apocolypse countdown)
09:46 PM rue_mohr: the motors need about 20ma CC
09:46 PM rue_mohr: I need it to be bipolar
09:46 PM rue_mohr: I'm thinking of an amp, with the feedback resistor right off the amp output
09:46 PM ^kat^-afk: ok
09:47 PM rue_mohr: have the input scale 0-5V into -? to +? @ 20mA
09:47 PM rue_mohr: thoughts?
09:47 PM rue_mohr: I can never remember which is a transimpedence amp and which is a transconductance amp
09:47 PM ^kat^-afk: run a cheapo +/- 22v audio amp off two 19v wallwarts
09:48 PM rue_mohr: I have 7*3 segments to operate
09:48 PM ^kat^-afk: you didn;t specify voltage
09:48 PM rue_mohr: its less than 3
09:48 PM ^kat^-afk: o
09:48 PM rue_mohr: I think LM 386 is overkill
09:48 PM ^kat^-afk: thenuse cheaper opamps and one 19v wallwart
09:49 PM rue_mohr: for bipolar operation, howd I split the supply?
09:49 PM ^kat^-afk: yeas, but consider parts count and misc support parts, you are right at max current for dip-4 opamps, so you need a current boost (2 transistors per motor)
09:49 PM rue_mohr: wjat amp can do 20mA
09:50 PM ^kat^-afk: two resistors and two darlingtons, considering you are driving motors, the exact split isn;t necessary
09:50 PM ^kat^-afk: TL081 - 84
09:50 PM ^kat^-afk: BUT, it's at max current to do so
09:50 PM rue_mohr: dont want to have to H bridge them...
09:50 PM ^kat^-afk: may fail
09:51 PM ^kat^-afk: so use any you have and a two-xistor boost
09:51 PM rue_mohr: I wonder if I'll get enough torque with less current
09:51 PM ^kat^-afk: i dunno
09:51 PM rue_mohr: like to keep te parts coutn down
09:53 PM rue_mohr: I cant think of a way...
09:53 PM rue_mohr: hey wait
09:53 PM rue_mohr: whats the current for rs232?
09:54 PM rue_mohr: maybe I can use a max232 with an external power supply?
09:54 PM ^kat^-afk: i don;t remember
09:54 PM rue_mohr: or 1489?
09:57 PM ^kat^-afk: http://designerthinking,com/images/rue.JPG
09:58 PM rue_mohr: http://designerthinking.com/images/rue.JPG
09:58 PM rue_mohr: ah
09:58 PM ^kat^-afk: adjust accordingly, since you need to pick the voltas, amps, gain, etc
09:59 PM rue_mohr: +-, the idea of the op-amp was to use it for current limiting the output
09:59 PM rue_mohr: right
09:59 PM ^kat^-afk: sorry
09:59 PM rue_mohr: np
09:59 PM rue_mohr: I think that leads me to another idea
09:59 PM rue_mohr: what if I drive it like an lcd
09:59 PM rue_mohr: the right half of your diagram goes to a clock line
10:00 PM rue_mohr: and the left half is 0 or 180 out with it
10:00 PM rue_mohr: +- that current limiting
10:00 PM rue_mohr: then it could be ~almost~ digital
10:00 PM rue_mohr: the current limit could be done with just resistors
10:01 PM rue_mohr: in which case, maybe just the transistors are enough
10:01 PM rue_mohr: I wanted to see if I could get totem pole drivers in a package tho
10:01 PM rue_mohr: save space and some wires
10:01 PM ^kat^-afk: hence the opamp
10:02 PM ^kat^-afk: some ttl buss drivers can do 60ma, but they aren't bipolar
10:02 PM rue_mohr: the transistors obsolete the op-amp tho, the idea of the op-amp was to use its totem output AS the driver
10:03 PM rue_mohr: these motors are 0.2"x 0.2" x 0.44" long
10:03 PM rue_mohr: if I take them out of the ribber jacket, 0.16" dia x 0.44" long
10:03 PM rue_mohr: rubber jacket
10:03 PM ^kat^-afk: bigger opamps, aka audio power amps, can sswing the voltage and the current
10:04 PM rue_mohr: two of these motors are the size of a dip-8
10:05 PM rue_mohr: side by side
10:06 PM rue_mohr: you understand the scale of them?....
10:06 PM ^kat^-afk: small
10:06 PM rue_mohr: miniturized small
10:06 PM rue_mohr: you could snort these things
10:06 PM rue_mohr: that is, their snortable...
10:07 PM ^kat^-afk: not sure i am into that
10:07 PM rue_mohr: I hav to cut back on my heavy metals
10:11 PM * ^kat^-afk eats some drugs
10:18 PM rue_mohr: any luck on soldering int eh 7805?
10:19 PM ^kat^-afk: i'm eating drugs, take a guess?
10:19 PM rue_mohr: dont know hwo the rest of the day went for ya
10:21 PM ^kat^-afk: well, someone parked 1/3 in a blue parking spot, and 2/3 on the ramp, and then blamed me for it
10:21 PM ^kat^-afk: i didn;t get much sleep the other nite, and had to take a 2nd pill
10:21 PM ^kat^-afk: and a 3rd dleeping pill
10:21 PM rue_mohr: so, your days go better when you stay home
10:22 PM ^kat^-afk: very much
10:26 PM rue_mohr: so flurry did a neat trick in his i2c code
10:26 PM ^kat^-afk: so i am thiking you could solve most of your problems with shipping from usa to Canada with a 10ft wingspan, glider profile, and a chainsaw engine
10:26 PM rue_mohr: he used the carry as a 9th bit to control a serial tx/rx loop
10:26 PM rue_mohr: the mil would shoot them down
10:26 PM rue_mohr: zhanx, yes?
10:26 PM ^kat^-afk: fly lower then
10:27 PM rue_mohr: pretty sure the border patrols are on it
10:27 PM ^kat^-afk: if i lived up there, i'd take that as a bet
10:27 PM rue_mohr: if you so much as throw a 30Lb bag of pot over the line they descend like flies on
10:27 PM ^kat^-afk: oh, then do that, and fly the plane elsewhere
10:28 PM rue_mohr: now THAT I can see working!
10:28 PM * rue_mohr looks sideways at z
10:29 PM rue_mohr: so, he used the carry as a 9th bit
10:29 PM ^kat^-afk: once Trump gets this wall built, i expect to see a huge market for treabuchets open up
10:29 PM ^kat^-afk: no doubt some of then things thrown over the wall will glide for some distance
10:30 PM ^kat^-afk: the wall itself can be part of a simple slingshot
10:30 PM rue_mohr: to transmitt, he set the carry, transmitted bit 0, and shifted w/carry into TXR
10:30 PM rue_mohr: the carry kept the byte non=-zero for testing if all the bits were sent
10:30 PM zhanx: the wall is gonna crush democrats and their slave labor immigrants
10:31 PM * ^kat^-afk sighs
10:31 PM rue_mohr: it was a great trick
10:31 PM rue_mohr: trying to think of how to pull it off in C
10:31 PM rue_mohr: and I dont think I can get close
10:32 PM zhanx: rue_mohr: think i saw that hand shake that was a tricky thing
10:32 PM rue_mohr: that did convert to C you know
10:32 PM rue_mohr: the C port works
10:33 PM rue_mohr: I successfully ported AVR asm to stm32 C
10:33 PM rue_mohr: it gives me a little hope that I can port myself to a GPU
10:34 PM zhanx: ok
10:35 PM ^kat^-afk: will you know when you have succeeded by expereinceing environmanetal inputs thru the fpga?
10:35 PM rue_mohr: there are so many things to figure out
10:36 PM rue_mohr: right now, I have the ability to build a body and work via it, to make sure it can do what I need
10:36 PM rue_mohr: that bit will be steep
10:36 PM rue_mohr: as I go I will learn more
10:36 PM rue_mohr: and maybe I'll succeeed
10:36 PM rue_mohr: all that depends on my success is my existence.
10:37 PM * ^kat^-afk watches the cartoon president
10:38 PM rue_mohr: pretty sure my existence means more to me than anyone else, so its basically worthless
10:38 PM ^kat^-afk: praps your GPU can convince you of the truth
10:38 PM rue_mohr: twisted wrong
10:38 PM rue_mohr: pretty sure my existence isn't worth much to anyone but me...
10:39 PM rue_mohr: hmm
10:39 PM rue_mohr: I'll work on that
10:40 PM * ^kat^-afk tries a fewmore times to dl the youtube of Toyota T-HR3
10:40 PM ^kat^-afk: they built a telepresence for it
10:41 PM rue_mohr: how they do with the delay
10:41 PM rue_mohr: ?
10:42 PM rue_mohr: & is logical or bitwise?
10:42 PM ^kat^-afk: sorry, been having trouble with the dl, praps you can do that ans tell me?
10:42 PM rue_mohr: ?
10:42 PM ^kat^-afk: maybe there's an HR-4 nowl i dunno
10:43 PM rue_mohr: kinda curried in coding , not a good time for searching for misc youtube videos
10:43 PM rue_mohr: void txByte(uint8_t d) {
10:43 PM rue_mohr: uint8_t m;
10:43 PM rue_mohr:
10:43 PM rue_mohr: for (m = 0x01; m<<1; ) {
10:43 PM rue_mohr: if (m & d) { }
10:43 PM rue_mohr: else { }
10:43 PM rue_mohr: }
10:43 PM rue_mohr: }
10:48 PM rue_mohr: kat, what kinda sodlering iron do you have?
10:49 PM rue_mohr: is it a weller?
10:49 PM ^kat^-afk: cheapo 25w and an olde W-60
10:49 PM rue_mohr: hmm
10:49 PM rue_mohr: copper or steel tip?
10:50 PM ^kat^-afk: "iron" both of them
10:50 PM rue_mohr: I find it dosn't get eaten back as fast as copper
10:50 PM rue_mohr: have a stand?
10:51 PM ^kat^-afk: yeas, which i fastened to a slab of steel to keep it where i put it
10:51 PM * rue_mohr nods
10:51 PM rue_mohr: do you prefer sponge or brush?
10:51 PM ^kat^-afk: wet sponge
10:52 PM ^kat^-afk: *damp*
10:52 PM rue_mohr: yep, I ended up prefering a brush
10:53 PM rue_mohr: wtf, this is messed up
10:53 PM rue_mohr: the bits aren't sent right
10:53 PM rue_mohr: they say the address is 0x46, so they send 01100100
10:53 PM rue_mohr: left to right
10:54 PM rue_mohr: sorry
10:54 PM rue_mohr: their sending 01100010
10:54 PM rue_mohr: as 0x46
10:54 PM rue_mohr: ok, so lsb first...
10:55 PM rue_mohr: 0110.0010
10:55 PM rue_mohr: yea, lsb first
10:56 PM rue_mohr: so start mask at 0x01 and shift the mask left
10:57 PM rue_mohr: till its 0
10:57 PM ^kat^-afk: idot on yt is heating a quill red hot with a bearing on it
10:57 PM ^kat^-afk: so the bearing is ruined and the quillis bent
10:59 PM ^kat^-afk: it's now only 25 thou out
11:01 PM ^kat^-afk: so he adjusted it with some hammering, ow i can see the wobble more easily
11:10 PM * Tom_L wanders in quietly and sits at the back of the room unnoticed
11:11 PM ^kat^-afk: storms?
11:12 PM ^kat^-afk: [09:46:pm] <^kat^-afk> is Tom still on earth in an "alive" condition?
11:13 PM Tom_L: snow N, rain E of here
11:13 PM Tom_L: 71 this am, 41 currently
11:14 PM Tom_L: visibility 10mi
11:14 PM ^kat^-afk: weather was talking superstorm cells, tornadoes and wraths of dog there tonite, and here tuhmarah nite
11:14 PM Tom_L: pfft, i barely see past my nose
11:15 PM Tom_L: must be the E part
11:16 PM ^kat^-afk: as long as you and your are ok
11:16 PM ^kat^-afk: yourS
11:16 PM Tom_L: 4.5 Apr 9 5:22am
11:16 PM Tom_L: felt that
11:17 PM ^kat^-afk: http://content.wdtinc.com/imap/imaplite/?MAPID= you can zoom in
11:17 PM Tom_L: you might get it before me
11:18 PM * ^kat^-afk clicks on warnings to see where the fuss is
11:18 PM ^kat^-afk: wow, 1000's of polygons
11:19 PM * ^kat^-afk closed the winder
11:19 PM Tom_L: guess we've been warned
11:26 PM ^kat^-afk: https://www.smbc-comics.com/
11:29 PM rue_mohr: dmesg
11:31 PM * ^kat^-afk would luv a slab of moderately ok cooked fish right about now
11:48 PM ^kat^-afk: ebay seller has sent me msgs every day , sometimes 2, since i bought that 12v psu, so i replied again:
11:48 PM ^kat^-afk: Thank you. Please be aware i will be waiting a few days,
11:48 PM ^kat^-afk: as per your instructions and guidance.
11:48 PM ^kat^-afk: they have asked me to confirm stuff, and so i asked themt o confirm stuff
11:55 PM * ^kat^-afk waves gnites