<nicksydney>
ahhh so wifi uses 2.4ghz and even receiver like nordic also 2.4ghz so the difference is the comm protocol between the 2 devices that differentiate it
<nicksydney>
so that means we can even create a 2.4ghz module from scratch and determine what protocol we want to communicate with the other end
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<DocScrutinizer05>
whitequark: did you check your CNC?
<DocScrutinizer05>
whitequark: btw Galden droplet test finished. I can't *see* any more of the liquid, which doesn't mean it vanished. Rather I guess it simply spreaded across the glass so much that it became invisible
<DocScrutinizer05>
I might try some powder and see if it sticks somewhere
<whitequark>
DocScrutinizer05: oh you mean, check it with soundcard scope
<wpwrak>
you should look at NXP. they have even more ARMs ;-)
<DocScrutinizer05>
whitequark: maybe even just start with probing voltages on motor coils. Check them right after power up of controller, with no PC attached
<whitequark>
hm
<DocScrutinizer05>
check the optocoupler output levels
<DocScrutinizer05>
should all be same with no PC attached, right?
<whitequark>
yes, they're pulled up at lpt side
<DocScrutinizer05>
ooh, those are only for output?
<DocScrutinizer05>
anyway, check them, I seen them going nuts several times
<whitequark>
well, there are optocouples for input too
<whitequark>
but they're not relevant here
<DocScrutinizer05>
for some weird reason optocouplers seem not be the most reliable of all conponents
<DocScrutinizer05>
why do you think so?
<nicksydney>
wpwrak: for some reason NXP is very expensive compared to ST, SiLabs or Atmel
<whitequark>
DocScrutinizer05: um, why would they be?
<DocScrutinizer05>
when a input OC has a hit, it might inject bogus signal to stepper
<whitequark>
wait, here I use input/output in relative to PC
<DocScrutinizer05>
meh
<DocScrutinizer05>
I don't
<DocScrutinizer05>
;-)
<DocScrutinizer05>
you have an ideal circuit to debug. You got 3 identical sub-circuits to compare
<DocScrutinizer05>
should be easy to spot where X circuit differs from both Y Z
<whitequark>
ultrasound transducer. basically same thing as before, but now inside blood vessels
<nicksydney>
it's freakin' tiny
<nicksydney>
mad !
<nicksydney>
how do they manufacture it
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<wpwrak>
the siglent sds2000 series may also be interesting competition to the rigol ds2000. very similar features, apparently decent quality, can have 4 analog channels, has 8 digital channels (MSO) as well, you even get an (IMHO not very useful) signal generator :)
<wpwrak>
that seems to be a new trend: integrate basic signal generators in scopes.
<DocScrutinizer05>
well, when it actually can generate arbitrary signals, then I can see some usecases
<wpwrak>
should have an AWG, yes. still ... i have a function generator (with AWG capability) and i never use it. should have bought a frequency counter :(
<wpwrak>
most of the time, when i need some signal, it's something digital. and out comes the ben ... ;-)
<wpwrak>
ben + UBB are pretty much key pieces of my lab. for virtually (*) all the in-circuit programming i do lately, it's the ben that's providing the brains
<wpwrak>
(*) except when starting with the KL25. but thanks to their firmware not even supporting the next relatively minor upgrade in the series, i was forced to move to my own solution there as well. of course using ben + UBB ...
<DocScrutinizer05>
some digita signal is an arbitrary signal in my book
<wpwrak>
yes, that's what i mean. AWG = Arbitrary Waveform Generator
<whitequark>
btw: acrylic lives fine through 20sec of 270°C
<whitequark>
another fun thing, while heating up that board I pointed a bright light source tangentially to it
<whitequark>
and I think I watched epoxy transition to glass
<whitequark>
and back
<whitequark>
the problem with it, I can't seem to dispense it properly
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<wpwrak>
nicksydney: oh, and when looking for scopes, you want to stay away from the likes of owon and hantek. they're cheap but unfortunately it shows.
<nicksydney>
wpwrak: gotcha
<wpwrak>
atten also seems to have a lousy reputation. gw instek, so-so. there's a bunch of more obscure brands, too.
<wpwrak>
that's what the establishment would really like to happen ;-)
<wpwrak>
(rigol) the siglent 2000 does actually look pretty impressive from what i read about it. might be a worthy competitor for the rigol DS2000 series. still very new, though.
<whitequark>
mtgox was far from a good exchange
<wpwrak>
for the lower price range, rigol DS1074Z for sure. can't beat that one :)
<whitequark>
I mean, you had to jump through a number of hoops which would make traditional banking proud
<whitequark>
and could withdraw money exactly 2 times a year
<whitequark>
also, customer service rivaling cable isps in quality
<whitequark>
wpwrak: I was more thinking, US cable ISPs
<whitequark>
they're proudly occupying 2nd lowest customer satisfaction index
<whitequark>
hm: https://btc-e.com/news/199 "2. The highest levels of security are already in place at BTC-e, and the company regularly uses external professional advice to further increase the security of our clients.
<whitequark>
errr not that
<whitequark>
"1. BTC-е is at its peak of financial strength with the record levels of clients and capital adequacy. The company plans to start publishing financial statements, verified by an external audit, on a regular basis."
<whitequark>
what kind of company deliberately seeks transparency? oh horror
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