#garfield Logs
May 04 2020
#garfield Calendar
12:38 AM aandrew: <info> app: Connected
12:44 AM aandrew: <info> app: got cccd write, notify=1
12:44 AM aandrew: <info> app: req: raw i2c read bus 0: 12 34 56
12:44 AM aandrew: <info> app: req: i2c read bus 1 (reg 0x02): 88 99 AA BB CC DD EE FF
12:44 AM aandrew: <info> app: req: i2c write bus 1 (reg 0x1234): 01 23 45
12:44 AM aandrew: <info> app: Disconnected
12:44 AM aandrew: yay
12:44 AM aandrew: i2c parser is parsing
12:44 AM aandrew: or rather i2c command parser is parsing
12:44 AM rue_mohr: :)
12:44 AM rue_mohr: fpga?
12:44 AM aandrew: now I take that and actually generate i2c commands, schedule the notify for the result and done
12:44 AM aandrew: nah
12:44 AM aandrew: this is just a BLE debug protocol
12:44 AM rue_mohr: heh, I wonder were I left my i2c slave code off at
12:44 AM aandrew: have a device and want to be able to inject i2c commands (or gpio commands, or raw memory read/write commands)
12:44 AM aandrew: just doing the hard one first
12:44 AM rue_mohr: I think I was having an issue where I needed more memory, but the larger chip had some hardware that meant I didn't need as much memory
12:44 AM aandrew: heh
12:44 AM * rue_mohr oscillates
01:24 AM polprog: morning rue_mohr
01:25 AM polprog: i can see youve liked my osc :)
01:25 AM polprog: https://i.ibb.co/42Q9k6M/IMG-20200504-082334.jpg
01:25 AM polprog: transformers from the scavenged CRT and a little extra
01:25 AM polprog: the variable core in the oscillator were just common mode chokes from dead PSUs
01:34 AM rue_mohr: the middle one looks like the HOT drive transformer
01:34 AM rue_mohr: the left one looks like a high votlage focus transformer
01:35 AM rue_mohr: meaning the right one would be a standby power transformer
01:35 AM rue_mohr: tho I'm not sure on that
01:36 AM rue_mohr: huh, can I see the diagram for the current controleld collpits?
01:36 AM rue_mohr: er 5V 100R
01:36 AM rue_mohr: hmmm
01:36 AM rue_mohr: you missed a line on the FSK
01:36 AM rue_mohr: C to upper bias resistor
01:37 AM rue_mohr: hmm, self bias with a voltage divider, hmmmmm
01:37 AM rue_mohr: neat
01:50 AM polprog: all three circuit diagrams are accureate
01:51 AM polprog: in the CRT theres also a big flyback ofc
01:52 AM polprog: 5V 100R but thats not 50mA, the current source is crude and the pot is 100k..
01:52 AM polprog: should have been measuring the current
01:52 AM polprog: ah, i see the missing line
01:52 AM polprog: right!
01:53 AM polprog: breakfast time
01:57 AM polprog: whats a HOT transformer? Horizontal output?
07:00 AM polprog: the right one could have been a stand-by power transformer, it went between the isolation barrier in the psu area
08:15 AM rue_mohr: yes
08:39 AM rue_mohr: fsm
09:29 AM polprog: fsm?
12:03 PM polprog: https://polprog.net/rozne1/ircjunk/various/colpitts1/
12:37 PM polprog: ive added attenuation calculations to the RCLP program
02:23 PM zhanx: ok final interview tomorrow at 830
03:22 PM rue_mohr: finite state machine
03:39 PM polprog: what has a finite state machine to do with the oscillator
03:39 PM polprog: also, check out the new version of the RCLP program..
03:43 PM rue_mohr: nothing
03:44 PM rue_mohr: jak_shadows is working with my hobby servo code
03:44 PM rue_mohr: gimme the url again!
03:52 PM polprog: https://polprog.net/rozne1/ircjunk/various/rclp.tgz
03:52 PM polprog: ah, ok
03:52 PM polprog: not doing electronics today cause i have to keep the bench clean for the livestream..
03:53 PM polprog: have to? want..
03:53 PM polprog: i dont have to do anything
03:53 PM polprog: picked a socket 3 motherboard, HP, for $5 with shipping
04:07 PM rue_mohr: nice
04:07 PM rue_mohr: does it come with the socket?
04:08 PM rue_mohr: :)
04:08 PM polprog: yep
04:11 PM polprog: its got quite some integrated peripherals for a 486
04:21 PM polprog: hmm, theres the nicad charger PCB screenshot in the files in various/
04:21 PM polprog: maybe i should finish that
04:21 PM polprog: im afraid my only LM358 was mounted on the breakout
04:51 PM polprog: hmm, small bug fix in the attenuation section
04:51 PM polprog: same url
04:51 PM polprog: its also here: https://gitlab.com/coniferous/rclp
05:25 PM zhanx: rue_mohr, did you notice interview is tomorrow to finish this job search?
05:37 PM aandrew: https://www.thingiverse.com/thing:4336429 wire that’s a nice design
05:37 PM aandrew: Don’t need a power supply but the case design is really nice
05:39 PM rue_mohr: zhanx, good show
05:39 PM rue_mohr: aandrew, heh, designed like a welder
05:40 PM rue_mohr: a lincon
05:47 PM aandrew: Yep
06:19 PM aandrew: so
06:19 PM aandrew: I'm going to build a couple workbenches in the garage
06:20 PM aandrew: the idea is basically a really good solid table, nothing fancy, no backstop or anything
06:20 PM aandrew: does anyone have any "zomg make sure you do this" or "whatever you do don't do this" advice?
06:21 PM Tom_L: 1/2" plate steel for the top
06:22 PM aandrew: it's gotta be pretty damned solid, I'm thinking of using either 1/2" or 5/8" plywood for the top surface with a 2x4 "skeleton" underneath, or perhaps even just making the top out of edge-stacked 2x4s
06:22 PM aandrew: Tom_L: that'd do it, but I don't have the means to lift such a thing :-)
06:22 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Drillpress.jpg
06:23 PM aandrew: the legs I was thinking of using 4x4s and sitting on heavy duty locking casters
06:23 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Assembly/Y_Axis_Mockup.jpg
06:23 PM aandrew: I think the first bench I build will be wood, but might get adventurous and build another out of steel
06:24 PM Tom_L: 3/4 ply sheet with cabinets under it
06:24 PM aandrew: what's underneath the plywood, any frame/skeleton or just the cabinets?
06:24 PM Tom_L: 2x4
06:24 PM aandrew: looks kind of narrow too, are you happy with the depth of the workbench?
06:25 PM Tom_L: yeah
06:25 PM Tom_L: average 'counter' depth
06:25 PM Tom_L: a bit wider maybe
06:25 PM aandrew: I think that's 24"?, gotta measure my counters now :-)
06:26 PM aandrew: my main work table is a 30" folding table
06:26 PM aandrew: I think that's about the depth I'd like
06:26 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Welding/Z_Column_tack3.jpg
06:26 PM aandrew: it's 3/8" MDF on a metal "skeleton" for rigidity
06:26 PM Tom_L: my sherline sat on it fine
06:27 PM aandrew: ok
06:28 PM aandrew: I think I might go for a single row of drawers under the main surface, and open under that. I've never had luck with cabinet doors (as in they're always opening the wrong damned way)
06:28 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Welding/Column_Supports1.jpg
06:28 PM Tom_L: i've usually had plenty of work room on it
06:28 PM aandrew: https://i.redd.it/briny26wnew41.jpg :-)
06:31 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Paint/Paint3.jpg
06:31 PM Tom_L: kindof an overview of the bench
06:31 PM Tom_L: i keep hand tools etc under it
06:33 PM aandrew: *nods*
06:33 PM aandrew: thank you for the inspiration
06:33 PM Tom_L: steel table is to the right of it on the other wall
06:34 PM Tom_L: i've had the steel table since i was a kid
06:36 PM aandrew: yeah the wood bench was going to have the vise and most of the day to day work on it, and once I'm better at welding, the metal one with a ... "diamond fence" surface
06:36 PM aandrew: for welding
06:36 PM aandrew: not sure what that kind of surface is called
06:36 PM aandrew: same kind of pattern as a chain link fence, but welded together and smaller
06:37 PM Tom_L: diamond plate
06:37 PM Tom_L: oh
06:37 PM aandrew: no that's solid with "ticks" in it for grip
06:37 PM aandrew: they use this "open" metal mesh for stairs too
06:38 PM aandrew: ah
06:38 PM aandrew: diamond mesh
06:38 PM aandrew: that's what it's called
06:38 PM aandrew: actually not sure if that's going to work, it'd have to be pretty thick to be a useful surface
06:39 PM Tom_L: yup
06:39 PM Tom_L: sharp edges too
06:40 PM aandrew: I have to get good at welding first before I'd attempt to make a table
06:40 PM aandrew: wood's a lot more forgiving
06:40 PM aandrew: I asked for a nice sliding compound mitre saw for my birthday, let's see if it shows up tomorrow :-)
06:57 PM rue_mohr: my benches are just 24" deep
06:57 PM rue_mohr: the lip on the edge is a saver
06:57 PM rue_mohr: that little bit with the plywood hanging out
06:57 PM rue_mohr: it shields power bars, and gives a surface to clamp/clip to
07:16 PM aandrew: yeah definitely need a lip there
09:14 PM Tom_L: in the bios, what is cpu C state support?
09:14 PM Tom_L: c1 c6 c7
09:14 PM Tom_L: would that affect latency?
09:17 PM Tom_L: sleep states for power savings...
09:22 PM aandrew: holy fuckballs that was a tough slog
09:22 PM aandrew: I can now make and receive I2C requests over BLE
10:47 PM rue_mohr: Tom_L, I dont know
10:47 PM rue_mohr: aandrew, ok!
10:48 PM Tom_L: rue_mohr, it didn't help anyway
10:49 PM Tom_L: pretty sure that MB is crap for this purpose
11:35 PM rue_shop1: they can be