--- Log opened Fri Oct 14 00:00:47 2022
00:07 < nmz787> maaku: typing via starlink right now, aye aye!
00:07 < nmz787> https://www.thetruthaboutcars.com/2014/07/rolling-gasified-coal-gas-bag-vehicles/
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06:53 < muurkha> nmz787: hey, that's great news!
09:42 < nmz787> what's the best option these days for a MCU dev board, the shortage means a bunch of the devboards I remember are not in stock any more...
09:42 < nmz787> I need something with a 12 bit ADC and 2 12 bit DACs
09:42 < nmz787> I was searching digikey/mouser and this came up: SLTB009A -- $30.... however I can't tell if the development environment is crap or not... and there doesn't seem to be micropython support (which would be nice, but not an hard requirement)
09:43 < nmz787> being able to just jump in, i.e. via arduino env, or some other open-source flow (i.e. easy to install and get running without gigabytes of vendor bloatware)
09:46 < pasky> 17:49 <+HN> Cooling the Earth with a sunshade near the inner Lagrange point (2006) :: https://www.pnas.org/doi/10.1073/pnas.0608163103
09:50 < nmz787> arduino Due might fit the bill, at least in the short term
09:50 < nmz787> around 2x the price I'd like to pay though
09:51 < nmz787> but I guess that's "electronics shortage" for you :/
09:58 < muurkha> nmz787: teensy and bluepill seem to get a lot of play.  Adafruit has their Feather, and things that use their CircuitPython are even easier than Arduino
09:58 < muurkha> you just drop a .py in their USB clock storage
09:58 < nmz787> the only teensy that fits, is out of stock :(
09:59 < muurkha> I think upstream Micropython does the same thing
09:59 < nmz787> yeah micro/circuit python support would be nice
09:59 < nmz787> I've hacked on that a fair amount, years ago
09:59 < muurkha> micro/circuit python support is pretty widespread these days
09:59 < nmz787> it was really nice to shove PY files at the thing, and add C extensions for performance as-needed
09:59 < muurkha> and it supports an astonishing amount of Python at this point
10:13 < nmz787> https://github.com/Sam3258/micropython-due/tree/master/atmel-sam3x
10:13 < nmz787> DAC and ADC reported to work
10:18 < muurkha> neat
10:28 < nmz787> arduino due is about a decade old... gotta be something more recent, with hopefully better analog specs
10:32 < muurkha> the STM32G491RET6 looks pretty nice
10:34 < muurkha> three 4Msps 12-bit ADCs, two 15Msps 12-bit DACs, and two more 1Msps 12-bit DACs
10:35 < muurkha> US$10.28 at Digi-Key in quantity 1, out of stock now
10:37 < muurkha> I mean, it was a few months ago when I got one
10:37 < muurkha> now it's US$11.87
10:55 < nmz787> hmm, sounds good except not availanle
10:55 < nmz787> did it come in any dev boards?
11:01 < nmz787> https://www.newark.com/stmicroelectronics/nucleo-g491re/stm32-nucleo-64-board-arm-cortex/dp/24AJ1588?CMP=AFC-OP
11:01 < nmz787> available!
11:01 < muurkha> no, I have this naive idea that I can connect it to some batteries and decoupling capacitors like an AVR, and hook up SWD, and it will start working
11:02 < muurkha> (I guess the AVR doesn't need decoupling capacitors unless you care about analog precision)
11:02 < muurkha> and I have this other naive idea that OpenOCD will know how to put code into it ove SWD
11:02 < muurkha> I haven't tried these things so I don't know if they are true
11:03 < muurkha> maybe I am going to be very sad
11:06 < muurkha> in particular I do not want to use Stm32Cube
11:09 < nmz787> that link says arduino supported
11:10 < muurkha> yeah, but I think the Arduino support is not free software, which you might not care about
12:03 < nmz787> ugh, the devboard is in their UK warehouse
12:03 < nmz787> let's see what terrible shipping price they quote
12:06 < nmz787> $10, ok, ordering 2 of those boards then
12:08 < muurkha> I look forward to hearing how it goes
12:09 < nmz787> hopefully they just have a download that patches the arduino env, and I can be up and running in a few minutes
12:09 < nmz787> :D
12:09 < nmz787> arduino env is free enough for me ;)
12:09 < muurkha> I think that is correct
12:22 < L29Ah> stm32 is like the best supported MCU line in the open source world
12:32 < muurkha> is it?  is there an open-source Arduino runtime for it, for example?
12:33 < muurkha> I feel like AVR8 is still better supported
12:35 < L29Ah> arduino is shit, doesn't see much point in supporting it
12:35 < L29Ah> avr lacks even an on-chip debugger and is generally inferior both in traditional computational capabilities, and peripherals
12:36 < muurkha> those are all true
12:36 < muurkha> what is the best runtime to run on STM32?
12:36 < L29Ah> what do you call "runtime"?
12:37 < L29Ah> rtos? i liked chibios
12:37 < L29Ah> something dumber? libopencm3 is neat
12:38 < muurkha> well, STM ships this big HAL thing
12:38 < L29Ah> st itself provides some example drivers for most of things but they're meh
12:38 < muurkha> I mean ST
12:38 < L29Ah> yeah
12:38 < muurkha> bearing a license that purports to prohibit you from running it on compatible second-source chips like the GD32
12:38 < muurkha> thanks for the pointers!
12:39 < muurkha> libopencm3 looks great
13:15 < nmz787> I tried using that once, I think, for the LPC 4370
13:16 < nmz787> (lpc link vs devboard, which isn't made anymore it seems)
13:16 < nmz787> 80MSPS ADC in that baby :D
13:16 < nmz787> always wanted to make something cool with it, but alas....
13:45 < muurkha> 80Msps is pretty snappy, singlechannel?
13:45 < nmz787> I think it had a MUX you could use too
13:45 < muurkha> sure, everyone does, but that isn't really what you want for an oscilloscope
13:52 < nmz787> someone who I mentioned that chip to suggested it might have been for some custom product that they ended up reselling as a generic part... and I think the suggestion was that it was a biomedical device that had a lot of sensors and thus needed the MUX across like 80 pins or something crazy
13:52 < nmz787> I can't remember where this supposition came from
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23:08 < muurkha> 80 pins is a lot
23:09 < muurkha> biomedical devices probably don't benefit from 80 Msps
23:09 < muurkha> nothing macroscopic in your body changes at over 100 kHz
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23:45 < fenn> 80MSps is crazy fast
23:46 < fenn> good for SDR i guess
23:47 < fenn> nmz787: ESP32 has a 12 bit ADC, 2x 8-bit DAC, perhaps some resistor ladders could be added to get the remaining bits
23:47 < fenn> they're highly available :P
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23:49 < fenn> you might already have one
23:50 < fenn> it should work with the arduino IDE
--- Log closed Sat Oct 15 00:00:48 2022