Also consider the $16 Chip Pro (https://getchip.com/pages/chippro),
which runs linux and thus lets you write normal code for the normal
things.
They also have a $9 more arduino-like version (still runs linux)
-j
On Sun, May 14, 2017 at 11:22:57PM -0700, Chris Albertson wrote:
> Are you still g
I realize that, in theory, the designs for these things are relatively
straightforward. Unfortunately, the *vast* majority of my experience is
in the digital world, so the best I could probably do on my own is
Frankenstein some hopefully-appropriate circuits together and hope the
result is usab
Does anyone know of any schematics for amplified GPS splitters floating
around out there? I looked a while back and couldn't find anything. I
use a 58536A right now, but it's big and I hate having to have N to SMA
cables. It would be awesome to be able to roll my own with all the
connectors I
On 2016-11-30 13:45 , André Esteves wrote:
Millimeter accurate GPS in smartphones and self driving cars would
result from tiny atomic clocks
I saw a different form of this article a month or so back, and for the
life of me I can't figure out how having a tiny atomic clock helps GPS
accuracy at
> 1 This board has got exposed test pads for lots of 1PPS / frequency in /
> out pins tied to timestamping hardware making it very easy to tap into
> them. This is a great opportunity which begs to be exploited.
I was actually unaware that you could discipline these ports like this!
This is actual
So there's been a lot of discussion going around on how to do GPS foo on
pcengines.ch's apu2 hardware, but there's one question I haven't seen
discussed ... which I'm now going to discuss. Or at least ask about.
I can't find a public datasheet for the actual processor in these (a AMD
GX-412TC
On 2016-10-05 10:22 , Jay Grizzard wrote:
Because NTP normally never actually sets you clock to match a server's
clock. It adjusts the RATE of your clock so the it cruises on the middle
of the pack of vetted servers.
To be nitpicky, it doesn't actually track towards the median,
Wouldn't you also not be able to actually sync to the individual chips,
since you can't really see the start of any given chip so much as you
just see the correlation over larger sections of the stream? Plus you'd
have to track only one SV at a time (right? Since I doubt the edges of
every chip
> This idea pushes extra complexity into every implementation of low
> level kernel-space software, firmware, and hardware. That's nice as a
> policy for full employment of programmers, but it's hard to justify by
> any other metric. Instead those low level places should be as simple
> as possibl
On Wed, Jul 20, 2016 at 09:37:02PM +0200, Martin Burnicki wrote:
> The UTC/leapsecond data sent by the satellites contains the UTC offset
> before and after the leap second event time. This has been 17/17 until
> recently, and is 17/18 now.
>
> The GPS satellites didn't start all at the same time
On Tue, Jul 19, 2016 at 11:39:29PM +, Mark Sims wrote:
> The GPS satellites are now reporting the pending leapsecond...
>
> The Z3801A has it messed up... it says the leap will occur on 30 Sep
> 2016 (73 days). The Z3801A has two different messages that report the
> leap day... both are wro
On Thu, Jun 23, 2016 at 11:28:00PM +, Mark Sims wrote:
> A usable re-flow oven can be had for $300.
Do you (or anyone) have suggestions for usable reflow ovens in this price
range? Every time I've gone looking on Amazon, I've found ovens which
(according to reviews) had cycle timers were *horr
> Synergy has excess inventory of the u-Blox LEA-6T GPS flash module.
> The P/N LEA-6T-1-000 is the more expensive flash part that can be updated
> if new firmware becomes available. We can part with these at $16.50 each
> in 250 piece reels or $21.50 in minimum quantities of 10 pieces.
I'd tota
Since it seems to be a week for new projects on time-nuts... ;)
So I've been wanting to set up a power line frequency monitor for a while,
and now(ish) seemed to be a good time for me.
So initially, I was planning on doing a simple design that was posted here
a couple of years back, which basical
> It get's "interesting" when you look at the MTBF times on hard disks. Some
> of the figures quoted in hours related to an MTBF of over 100 years. From
> what I read before, this was based on you replacing the drive at the end of
> its service life (typically 3 years for consumer drives and 5 year
Are there currently any decent (intended (or at least usable) for timekeeping)
GPSs that support using L2/L5 for this purpose? Google is turning up lots
of nothing, for me...
-j
> Since it is a ???space weather??? determined thing, with L1 only, all
> you can do is guess at confidence levels. Th
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