@O.Rares arduino.cc/en/Reference/Board It may be possible to bypass the regulator out with 5V but if any voltage is applied to other power inputs, e.g. 0V short input, the LDO may be damaged.

techspot.com/news/…

@AdamUraynar @TonyEErocketscientist I tried a few hours with 2 steppers and I only made 1 move for a second and now it doesn't move anymore. I get 4.8V only if they are fully charged. I switched to a PSU...

@O.Rares You didn't ask about Ah capacity which is inversely related to battery ESR which MUSt be much less than stepper DCR of coil

Hm, it seems a lot of questions here can be explained by people being home schooled by a mirror...

@Tony Regarding all CMOS getting slower as they get hotter, I've worked with a CMOS system where fmax was at 200C

Here, I'll get you the publications

[1]A. M. Francis et al., “Extended High-Temperature Operation of Silicon Carbide CMOS Circuits for Venus Surface Application,” Journal of Microelectronics and Electronic Packaging, vol. 13, no. 4, pp. 143–154, Oct. 2016.

I really wish someone would finally get out a proper clockless CPU

@PlasmaHH And I would be happy if I never have to deal with asynchronous logic paradigms again

@W5VO why? its fun

small asynchronous state machines are fun little puzzles. I've worked on an 8031 core with Null Convention Logic, and now I never want to see NCL or 8051s ever again

Maybe we just are missing the proper tools to formulate it in a higher level way and synthesize the rest.

@PlasmaHH That was a limitation at the time

what nonsense is that?

@PlasmaHH if you can frame you question differently, I'm happy to answer.

@uhoh I had my fair share of conspiracy theory today, no thanks, I will happily watch my gps status app displaying all the reachable beidou sats instead

Is it receiving signals from them, or just plotting results from an ephemeris from the internet?

it is receiving signals and using it to calculate the position sometimes

requiring it to talk to sats would be utterly stupid and basically impossible to reach the projects goal

Which is why I postulated (near the end) that they might be talking about an enhanced resolution option, rather than the basic service. Thanks for the feedback!

there is no point for transmitting when you want higher accuracy.

with current cps you can get down to cm range with long enough integration time. You can easily design a system that has higher accuracy, but it is not necessarily backwards compatible

plus, from a military perspective it might not be a good idea to give people more than absolutely necessary to do satnav

Well I agree with that logic. And yet, the two linked articles are talking about transmitting. BBC usually gets space stuff, and science and tech right.

So I'm trying to understand what it is that they are talking about.

Have you ever had an iridium phone in your hands?

well there are certainly lighter items than that for lower bandwidth M2M signals, but I know what you mean.

iridium is in LEO, beidou is GEO

The whole Beidou system has about 28 satellites, half in MEO, half in GEO, though I don't know how many of each will be used for the final system and how many will be legacy or unused.

okay well I'm a big fan of the SE Q & A system, so I'll wait for an answer to be posted. Thanks for your input!

That wouldn't make it any much better for communication with billion of devices

@PlasmaHH @uhoh If the satellite is transmit-only (multicast to ground receivers), then it doesn't matter how many receivers there are. The majority of navigation satellites systems are designed that way (GPS, GLONASS, Galileo).

@NickAlexeev yep, it's looking like the BBC article just referenced another article without sufficient verification.

@W5VO YES I agree for Silicon Carbide, but I thought the question was referring to conventional ASICs , not ohmygod$ custom parts for deep well, automotive and space

@W5VO I had my fun with small async state machines in the mid70’s designing a full featured UART board and even if MOT released their chip a year sooner, I could not use it as it was not Mil-STD-883B available as my TTL was. B tells anyone I am old as dirt

@TonyEErocketscientist Have you met an engineer that doesn't enjoy being pedantic?

You said all CMOS, and that falls apart in non silicon technologies and some lower voltage stuff where Vth has a stronger effect on total gate performance at low temperature.

@PlasmaHH never saw the 1st Gen. Iridium phone after 3mos finishing automated testing of LNA/Tx specs in production when MOT cancelled the project. I was the 1st to find out reading the hotel newspaper headlines in Biz in W. Palm Beach as MOT in Chicago, Arizona and left coast were online in weekly conference call. So I went home to Winterpeg after warm winter golfing in FLA and had great experiences with MOT’s RF Designer in Phoenix

who could turn around a complex 10th order filter MLCC in 2 days from idea to prototype. The LNS/Tx test socket up to 6GHz was fascinating with <0.1dB Tx loss. And 0.001dB calibrated resolution on the Anritsu VNA.

Err, ehm new iPad spellcorrect argh. LNA/Tx

Correct @W5VO technically I am still OK.  Your  Response only applies to AlSiC, pronounced "alsick

@NickAlexeev exactly my point