#garfield Logs

May 11 2019

05:58 AM Tom_itx is now known as Tom_L
10:12 AM Tom_L: bluetooth was named after a viking king
10:12 AM Tom_L: a did you know moment...
10:18 AM rue_mohr: ?.. ok
10:19 AM Tom_L: Bluetooth was borrowed from the 10th-century, second king of Denmark, King Harald Bluetooth; who was famous for uniting Scandinavia just as we intended to unite the PC and cellular industries with a short-range wireless link.
10:19 AM Tom_L: since you were so quiet
10:19 AM Tom_L: :)
10:20 AM rue_mohr: fact of the day :)
10:20 AM rue_mohr: I'm working on coding up a frequency counter for my filter analyzer
10:22 AM rue_mohr: QOTD: did the fellow who came up with "One hit wonder" come up with any other phrases?
10:23 AM Tom_L: no idea, i've moved on
10:24 AM rue_mohr: hmmm
10:24 AM rue_mohr: my freq meter needs to go from 2Hz to 30kHz ish
10:25 AM rue_mohr: from what I can tell, at even 20khz the error of 16Mhz counts is pretty ugly
10:26 AM Tom_L: got a precision clock source?
10:27 AM rue_mohr: I'll use a 16.000Mhz module
10:28 AM Tom_L: temp compensated precision crystal is what you want
10:28 AM Tom_L: you want precision you have to start with precision tools
10:28 AM rue_mohr: the resolution at 30khz is 56hz
10:28 AM Tom_L: same with machining
10:29 AM rue_mohr: hmm, I like 0.1%, do I have that?
10:30 AM rue_mohr: 0.187% error
10:30 AM rue_mohr: so I'm good to 0.2% :/
10:31 AM rue_mohr: what I'm wondering is if I should just switch over to cycle counting at some freq
10:31 AM rue_mohr: if at 30khz, I count for 250ms
10:34 AM rue_mohr: at 30khz,with 250ms of counts, an error of 1 count is 0.02%
10:34 AM rue_mohr: somewhere the error crosses over
10:36 AM rue_mohr: at 8khz
10:46 AM Tom_L: why?
10:46 AM rue_mohr: the measurement error is less if you count cycles for a quarter second than if you count the time
10:46 AM rue_mohr: between cycles
10:46 AM rue_mohr: with 16Mhz counts
09:22 PM rue_mohr: --
10:14 PM Tom_L: ++
10:16 PM rue_mohr: so, a few new cnc machines to think on
10:16 PM rue_mohr: I got an XY vise and a drillpress for one
10:18 PM Tom_L: https://grabcad.com/library/cnc-5th-axis-1
10:18 PM Tom_L: i was pondering that
10:18 PM rue_mohr: just 3 axies is fine with me
10:19 PM Tom_L: that or a rotary using a 3 or 4jaw chuck
10:19 PM rue_mohr: if yo ucan code the rotary
10:19 PM Tom_L: as an indexer but not driven
10:20 PM Tom_L: the software i have won't handle that
10:20 PM Tom_L: some will
10:20 PM rue_mohr: hmm
10:20 PM rue_mohr: well I need to go see if sprintf will work
10:20 PM rue_mohr: or sleep
10:21 PM rue_mohr: checking the truck, the link from the wishbone to the stabalizer on the passengers side is gone
10:21 PM Tom_L: gone?
10:21 PM rue_mohr: explains the loud clunk when going over rouch terrain
10:21 PM Tom_L: i'd say
10:22 PM rue_mohr: it looks like the rubber bits went away and it ate thru the bolt
10:22 PM Tom_L: better check the rest too
10:22 PM rue_mohr: if needs new shocks anyhow
10:22 PM Tom_L: those are a pain on the front
10:22 PM Tom_L: iirc
10:22 PM rue_mohr: so, I'll do the oil and take it in for that
10:23 PM Tom_L: some reason i had to take out the front springs on mine
10:23 PM Tom_L: i forget why
10:23 PM Tom_L: but i almost didn't get em back in
10:23 PM rue_mohr: hard to compress them?
10:23 PM Tom_L: little room to work
10:23 PM rue_mohr: heh
10:23 PM Tom_L: i didn't have the right tool either
10:24 PM rue_mohr: cant be as bad as a new car
10:24 PM rue_mohr: that doesn't help
10:24 PM rue_mohr: ok, I'm either gonna fall asleep here or test this code
10:24 PM Tom_L: test
10:24 PM Tom_L: or sleep
10:25 PM rue_mohr: I picked up a morse practise keyer at a garage sale today
10:25 PM Tom_L: heh
10:25 PM rue_mohr: gonna change it a bit and give it to a buddy
10:25 PM rue_mohr: put in a player that will detect the length, and play "DEE!" and "DOH!"
10:26 PM rue_mohr: he's a radio fan who doesn't have time
10:26 PM Tom_L: time is a precious commodity
10:30 PM rue_shop1: ok I need an M88 with a serial port
10:30 PM rue_shop1: I'm... ouT? of breadboards?
10:30 PM rue_shop1: I must have about 20 of them... where...