sorear changed the topic of #riscv to: RISC-V instruction set architecture | https://riscv.org | Logs: https://libera.irclog.whitequark.org/riscv
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<josuah> a tiny cute one
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<solrize> nice, affordable too, the c3 is just a little bit deficient compared to the s2, it will be nice when there is a successor
<solrize> i like that the board comes with micropython already installed
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<solrize> https://www.aliexpress.com/item/4000598356310.html hey a gdvf32 board with a display
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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
<solrize> muurkha, use titanium it's more corrosion resistant ;)
<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
<solrize> https://www.casio.com/products/watches/g-shock/dw5600e-1v i guess they have gone more upscale
<muurkha> all of Japan has gone more upscale over the last 41 years
<solrize> 2 years on cr2016 bah
<solrize> they have some that use cr2025 dunno about 2032
<muurkha> 2 years on cr2016 is probably 5 years on cr2032
<solrize> well you can't put a 2032 into that watch
<muurkha> not without compromising its water resistance, surely
<muurkha> the Erika computer will use solar panels and not have batteries
<solrize> but it is $50 on spamazon
<muurkha> scamazon
<muurkha> gordonDrogon: I'd be interested in information on dive computer physical construction if you want to /msg me things to read
<solrize> https://casiofanmag.com/g-shock/g-2900/ this claims 10 years on a cr2025, introduced in 2002
<muurkha> nice
<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> gordonDrogon: http://www.heinrichsweikamp.net/ is 403 for me
<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?
<muurkha> I can't touch-type on a wristwatch, solrize
<solrize> that's just to program the watch yourself
<solrize> i have one of the old TI msp430 watches but its display is almost unreadable so i never use it
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