#garfield Logs

Oct 19 2021

04:15 AM Tom_L: nice
09:05 AM rue_mohr: morning
11:04 AM polprog: http://db.zmitac.aei.polsl.pl/BZ/krowy.html
04:50 PM Tom_itx is now known as Tom_L
06:09 PM Tom_L: nothing new to report
07:40 PM rue_mohr: ok
07:40 PM rue_mohr: I got some resistors from china
07:41 PM rue_mohr: 240 ohms, 1% :/
07:41 PM rue_mohr: 1% are cheaper :/
08:09 PM Tom_L: i should find my resistor assortment. i'm gonna need one when i set the current on that driver
08:09 PM Tom_L: and a pullup for something else but i forgot what
08:16 PM Tom_L: are getting thru hole resistors still a thing or are they becoming museum artifacts?
08:32 PM rue_shop3: thats what I got
08:33 PM rue_shop3: but 5% are more expensive than 1%
08:34 PM Tom_L: i probably have what i need for this (i hope)
08:38 PM rue_shop3: :) I know a guy
08:38 PM rue_shop3: haha, I can send it via fedex on a seacan
09:17 PM Tom_L: so i found a few other pins i'm using for GPIO that had functions tied to them
09:18 PM Tom_L: if you don't enable them in the config you can use them that way
09:18 PM Tom_L: and pcw confirmed the fpga pins will sink 24ma if set that way in the vhd which he said he did
09:19 PM Tom_L: you're familiar with that where you set the pin parameters...
09:19 PM rue_mohr: 24mA is way mroe than enough
09:19 PM Tom_L: i know
09:20 PM rue_mohr: its probably 24mA per io block tho
09:20 PM Tom_L: sourcing you can too however it drops way off the higher the voltage
09:22 PM Tom_L: pcw-home: They do, but only to about +2.5V
09:22 PM Tom_L: 01:59 PM pcw-home: (due to the increasing resistance of the bus switches)
09:22 PM Tom_L: 02:01 PM pcw-home: as the voltage gets closer the the switch cutoff at about 3.2V
10:05 PM Tom_L: so one of these days i'll need your help to calculate the steps per degree for that thing
10:08 PM Tom_L: i think the worm is 40:1 but i should check
10:09 PM Tom_L: that seems like a little much but it could be
10:10 PM Tom_L: that would be 9 degrees / crank turn
10:13 PM Tom_L: so is that 300 steps per rev on the stepper 1.2 deg per step
10:14 PM Tom_L: 33.33333 steps per degree?
10:14 PM Tom_L: 10 microsteps
10:14 PM Tom_L: 333.3333 microsteps per degree?
10:26 PM Tom_L: i somewhat got the A_axis config ready
10:27 PM Tom_L: stepper stuff etc that will be the same
10:27 PM rue_shop3: how many turns to a rev?
10:27 PM rue_shop3: is it a 1.8 degree motor?
10:30 PM Tom_L: 1.2 1.8?
10:30 PM Tom_L: it's common
10:30 PM Tom_L: maybe it is 1.8
10:30 PM Tom_L: i forget which one is common
10:31 PM Tom_L: i need to check tomorrow before i try to calculate it wrong
10:45 PM rue_shop3: 200 spr
10:46 PM rue_shop3: 3.6 is too common too