Topic for #qi-hardware is now Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben / atusb 802.15.4 wireless, and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs
<DocScrutinizer>
whitequark: yep, something like that
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<qi-bot>
Jon Phillips: @thisisparker @kaepora, @qihardware found here in beijing for $15 http://t.co/9PRusyWr ALL USB powered. You can do more more more. ( 176600903757991936@rejon - 10s ago via web )
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<DocScrutinizer51>
friggin spam
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<wolfspraul>
Jon is just excited about this hyper-integrated little computer :-)
<wolfspraul>
supported well by openwrt
<roh>
well.. nothing really new or special ;)
<wolfspraul>
I wouldn't agree. it's a full computer with case and wifi and antenna for 16 USD.
<larsc>
DocScrutinizer51: /ignore qi-bot
<wolfspraul>
and usb 2.0 host
<wolfspraul>
but it's not open hardware, for sure
<viric>
what computer?
<viric>
16USD? what children mounted it? :)
<wolfspraul>
a router, TL-WR703N (risking more spam :-))
<viric>
aah
<rejon>
viric, its ok, it was part of a conversation
<viric>
?
<viric>
what conversation?
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<whitequark>
wolfspraul: define "full computer"
<wolfspraul>
cannot
<whitequark>
is atmega8 a "full computer"? is stm32f103rb? it has usbhost too.
<whitequark>
and 32k of ram. more than Apple II
<viric>
;)
<whitequark>
just a cheap little router on stupid mips
<roh>
wolfspraul: yes. but that still isnt something special. most tp-link wifi routers and aps are in that pricerange if you buy more than single digit volumes
<wolfspraul>
I'm not here to defend tp-link or this router
<wolfspraul>
if you don't like it, please ignore it :-)
<wolfspraul>
it's not even open hardware
<rejon>
or better, get nanonote and milkymist up to compete with the tplink routers :)
<wolfspraul>
maybe I can include a 703n as a wifi-gateway for m1 though, but I shall work on that silently :-)
<wolfspraul>
to bring out the beauty of m1 *today* :-)
<viric>
hehe
<roh>
sure. i also dont want to talk it down. i use tp-link atheros chipset based devices myself. but its nothing special per se. neither the price nor its features
<whitequark>
srsly, usbhost and wi-fi are just readymade ip cores with a little bit of external components, and a readymade linux driver
* whitequark
uses tplink too, fwiw
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<whitequark>
DocScrutinizer51: I assembled your coupling circuit, and it, er, works very bad
<whitequark>
(through it's probably because I screwed something up)
<whitequark>
there is a LOT of noise which comes from somewhere, and has a peak on 875Hz
<whitequark>
according to fft
<whitequark>
simple: the gnd was broken in audio cable I used.
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<whitequark>
DocScrutinizer51: yeah, works fine
<whitequark>
but I removed a potentiometer across mic lines; the sound is better without it
<DocScrutinizer51>
OMFG, that training will kill me, at wednesday the latest
<whitequark>
what's with it?
<DocScrutinizer51>
ENEA code quality
<DocScrutinizer51>
about all related to C and C++
<DocScrutinizer51>
ALL
<DocScrutinizer51>
starting from pre/post-increment to communications in team to 'are you better thasn LINT?'
<DocScrutinizer51>
the booklet has 270p, we managed to eat thru 57 today. will be fun on day3
<DocScrutinizer51>
I already start feeling sick ;-D
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<whitequark>
DocScrutinizer51: I connected two modules simultaneously
<whitequark>
they work
<whitequark>
also, there's ~500mV ripple at the Vdd of each module (measured at its pin)
<whitequark>
and a 700mV ripple at the power source (three AA batteries)
<whitequark>
how bad is that?
<DocScrutinizer51>
probably not too bad yet
<DocScrutinizer51>
though you should make sure you use low ESR powersourse and thick wires for VDD
<DocScrutinizer51>
and GND
<DocScrutinizer51>
too high ESR is main culprit of strange annoying connection faults
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<DocScrutinizer51>
most likely AA batteries might be a suboptimal power source
<whitequark>
well, I use my wires in packs of 3
<DocScrutinizer51>
then OTOH you could add a 5000uF
<whitequark>
each one is .05 sq.mm, through
<DocScrutinizer51>
4700 actually
<whitequark>
also, near to each module I added a low-ESR 100u tantalum cap and a 100n ceramic one
<DocScrutinizer51>
way too low for the 2A bursts
<DocScrutinizer51>
anyway, I'm wasted. May I'll be back in an hour or so
<whitequark>
sure
<DocScrutinizer>
hey, Adam gave a new schem to us :-)
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<DocScrutinizer>
sorry whitequark - did you say your wires are 0.05mm^2 ?
<DocScrutinizer>
if that's correct, you probably want to use 20..50 of them
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<whitequark>
DocScrutinizer51: er, not sure. I shoulda find a caliper somewhere...
<whitequark>
DocScrutinizer51: btw, would you recommend to keep using a mechanical caliper, or are digital ones generally better (worse)?
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<wpwrak>
whitequark: some are as precise (and a lot more convenient). some are worse. ironically, the cheapest-looking digital one i have is very good.
<DocScrutinizer>
whitequark: I have no experience, but I heard the electronic calipers need *a battery* ;-)
<whitequark>
wpwrak: yeah, I observed the latter at times. For example, $1.5 chinese "switzerland" tweezers were way better than 5 times as expensive bought here...
<whitequark>
DocScrutinizer: oh. yes. a battery. that answers the question.
<DocScrutinizer>
sometimes for me that pretty much actually does
<viric>
I also dislike batteries
<viric>
we want supercapacitors.
<DocScrutinizer>
lemme do the math: battery: 2$, selfdischarge EOL: after 2 years the latest, number of usage during that period (YMMV): max 10 times avg.
<DocScrutinizer>
so one usage would cost me 20ct
<viric>
not to mention the ecological impact
<DocScrutinizer>
plus inconvenience of flat bat when I *really* need it
<whitequark>
viric: do you like RoHS too?
<viric>
whitequark: I don't know details of it
<viric>
whitequark: I've only seen marketing
<whitequark>
... or maybe think that there is "damage to ozone layer" which is "harmful to the planet"?
<viric>
I think a digital caliper is more polluting than a mechanical caliper
<viric>
for a very little win
<whitequark>
sigh
<whitequark>
on the topic of supercaps: we already have two kinds
<whitequark>
1) ionistors, but they kinda self-discharge in a few days
<whitequark>
2) rechargeable lithium batteries. have (almost?) the same look as the common coin-cell ones, but can be recharged with a small constant current; used in RTCs
<whitequark>
through I don't know where one can buy the 2)
<whitequark>
and afaik they can't be recharged in the "cellphone" mode, that is, go from 0% to 100% in a few hours
<whitequark>
DocScrutinizer: for me, the problem with these batteries is that you'll have a hard time finding $RANDOM pcs of LR$RANDOM when you least want to deal with it
<wpwrak>
DocScrutinizer: i think my battery-powered one has been up for more than 2 years by now. still works great. probably hundreds of measurements in that time. i use it almost daily. ymmv indeed :)
<wpwrak>
DocScrutinizer: i don't quite like the short (~ 1 yr) battery life of my micrometer, though. but then, that one is kinda hard to read without electronics. (it has the traditional scale, too)
<wpwrak>
(and yes, that one gets about 10 uses per year on average. for cases where i really want to know and where i need reproducible pressure)