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<solrize>
\dev\ice, yeah those have been OOS for a while, though digikey supposedly has them
<solrize>
also the display is not colour iirc
<muurkha>
gdvf32 with a display sounds pretty neat
<muurkha>
I mean gd32vf
<muurkha>
not sure if color would be always desirable; having 3× the pixels would mean 3× the data rate across the bus and probably higher power consumption
<solrize>
yeah both of those are nice and the longan was $5 when it first came out, and even included an enclosure, that they dropped pretty quickly
<solrize>
muurkha, true but i mean, if the display is on at all, that's power consumption. too bad reflective lcd is almost not a thing any more
<muurkha>
I have a longan on the way from digikey in theory
<solrize>
oh nice, did they give you a shipping notice?
<muurkha>
the sharp memory lcds are reflective
<solrize>
yeah but $$$$$$$ and consume power
<muurkha>
they consume very little power but yes
<solrize>
i think enough power to be unsuitable for always-on
<muurkha>
the protocol.com article you mentioned earlier said that one of SiFive's selling points is about 30% lower power usage per computron (than ARMs I guess)
<solrize>
i saw that claim for the 32vf
<muurkha>
well, the 400×240 display at https://www.adafruit.com/product/4694 claims 175 μW worst-case power usage, 50 μW best-case (when not changing)
<solrize>
hmm 0.45 wh/year not too bad
<muurkha>
a CR2032 coin cell is nominally 2.2 kJ
<muurkha>
so that's 4.8 months on a CR2032 if constantly flashing
<solrize>
yeah
<solrize>
vs the 1980s era casio g-shock wristwatch that supposedly ran 10 years on a cr2016
<muurkha>
or a bit over a year static. of course you have to take into account whatever is driving it too
<solrize>
or maybe it was a cr2032
<muurkha>
interesting, I didn't know about that; I usually had to replace 01980s wristwatch batteries after a couple of years
<solrize>
The G-Shock was conceptualised in 1981 by Casio engineer Kikuo Ibe when he accidentally dropped and broke a pocket watch given to him by his father.[1] The G-Shock was conceived as a watch which would have "triple 10" resistance, meaning it would have a battery life of 10 years, have a water resistance of 10 bar and could survive a fall of 10 metres.
<muurkha>
nice, that's a great thing to aim for
<solrize>
the seiko perpetual calendar was supposed to run 10 years and also be super accurate, like within a few seconds per year
<muurkha>
a few seconds per year would be 0.2 ppm, unlikely you could get that without an OCXO
<gordonDrogon>
hm. I need a waterproof watch - g-shock -> unobtanium on ebay )-:
<muurkha>
(which would take a pretty big battery to run for 10 years)
<solrize>
i'm sure theres tons of g-shocks on ebay
<solrize>
50,000+ results for g-shock
<gordonDrogon>
hm.
<gordonDrogon>
I obviously searched for the wrong thing. doh.
<gordonDrogon>
silly price new though )-: > £100
<muurkha>
my tentative plan for the Erika pocket computer is to hammer a 10mm-thick-per-side clamshell case out of 24-gauge sheet steel, pot the electronics inside with silicone, and cover them up with polycarbonate
* gordonDrogon
boggles.
<gordonDrogon>
you might want to look into the world of dive computers ...
<muurkha>
(a transparent polycarbonate sheet to cover up the LCD so I don't break it in use)
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<muurkha>
that's a good idea, thaks!
<muurkha>
*thanks!
<muurkha>
if I do that right I think it should be able to survive being run over by a truck
<gordonDrogon>
I've done a *lot* of diving and wrote some software for a dive computer many years back...
<solrize>
g-shocks start around $50 usd i think. there are lots of models, some pretty expensive
<muurkha>
it certainly would be, but I don't think I can source it, and it's a pain in the ass to weld or hammer (or stamp, but I don't have a press anyway)
<gordonDrogon>
might settle for the Casio f-91 and be labeled as a terrorist...
<muurkha>
and titanium would theoretically allow me to anodize awesome rainbow thin-film-interference colors on it, and I could make it much thicker at the same weight
<muurkha>
but I think it's out of my reach
<muurkha>
gordonDrogon: so far what I've found on dive computers doesn't go into any details about their construction
<muurkha>
my basic thought is that if I pot the whole thing in silicone except for the keyboard mechanisms then no amount of water pressure will make water leak into it
<solrize>
Auto-calendar (to year 2039)
<muurkha>
this sounds like the "Electronics completely encapsulated, no airspace left to crush or flood" bullet point on the OSTC page you linked
<solrize>
so the calendar is good for just 2 battery changes? meh
<solrize>
ha there is r/gshock
<muurkha>
I'd like to know how the buttons work
<muurkha>
solrize: agreed, I'm aiming for a 50-year lifespan
<muurkha>
not for my body, it won't last that long, but for the Erika
<muurkha>
so http://www.deep-ideas.co.uk/OSTCII.html says "the hardware schematics and software is available for everyone to view, and if you are so inclined, modify" but where do I view them?