nd my new build, there'll be solar panels on the 40°
equator-facing roof skillion in the coming months, and maybe a couple of
Redflow ZnBr redox batteries. They talk Modbus. We'll have to see what
actually goes in. Some simple LiFePO4 batteries might be a noticeably
cheaper interim soluti
last moment - for speed and ease. (The
vim spellchecker is also easier to customise and use for several
languages.)
Erik
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tmp/fred.xz
/tmp/fred.xz: XZ compressed data
And -c implies -k, AIUI.
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Add one more for GUI, disc, and path data
retrieval. It is the only one which is not RT, and would run linux. The
others would run a small RTOS.
With the serial bus and clock being the API, it could start off simple,
but soon someone would want to add capability negotiation
ould keep the axis controllers simple yet
flexible, I figure.
Motion commands could be sent on RS485 serial, before the primary step
sequence begins.
Erik
(Who hasn't read the whole thread, unfortunately. There's a 1 foot
diameter branch down in the front garden, and it needs to go before its
u
and
wombats, now. One of the latter started digging a 2 foot diameter burrow in
the soft sand of the fill pad under the new build. I've twice chased him
across the paddock after midnight at 25 km/h in the ute, with headlights
on high beam and honking the horn. I didn't know they could run t
quick fix. Op-amp
feedback is then from the new output.
Beyond that, you're up for a negative rail for the op-amp so that it can
easily reach 0v.
Erik
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4 bytes.
Atomicity? I always disabled interrupts during a queue read or write.
Those assembler functions took around 2.5 uS on a 20 MHz AVR ATmega, and
half of that is context switching. The remainder included setting and
clearing the semaphore which tells the consuming process whether there&#x
energy expended *attempting* to produce
> motion.
s/motion/acceleration E.g. the acceleration of bending a straight line
path into a circle. That only happens with centripetal (centre seeking)
force. Focus on this part, and the penny drops.
It should be clear by now, I figure.
(Apologies to Andy
eagues back in the '80s had been. My reaction to them describing
centrifugal force as a "fictitious force" was to reason that it is a
resultant force, equal and opposite to the centripetal force which is
continually accelerating the mass, just as gravity does with
astronomical bodie
position of the tightened nut will depend on brawn,
spanner length, and where in the ER collet's 1mm tolerance the tool
shaft diameter falls, I figure - i.e. it'll end up anywhere.
Erik
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http
On 17.06.19 11:18, Chris Albertson wrote:
> On Mon, Jun 17, 2019 at 2:08 AM Erik Christiansen
> wrote:
> >
>
> > Since my Udoo X86 went wobbly, I'm looking for a new youtube machine.
> > (The video breaks up after ten minutes of running, without the
> >
without systemd) on it. That works a
treat on the Udoo X86.) Hmmm, I must unearth the Bitscope oscilloscope
adaptor and take a look at the supply rail.
Erik
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spec sheets I've read, so the battery inconvenience seems hardly worth
any (half) percent you'd win.
Erik
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ur national TV broadcaster. (They're quick
to update/rectify if there's a slip-up, and we post more current info.)
We've been over the durability issue upthread, so I'll limit repetition
to that.
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1.0550559
Polish a bit off, and it'd be fully compatible. ;-)
Erik
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e, and summer aircon similarly.
My preference is for installing it in a corner of the workshop or
garage, in an enclosure vented to the outside, as in extremis it can
emit a puff of bromine gas, and that pongs.
Erik
¹ Last time I looked. The price may be improving, by degrees.
(I don't da
Physical Characteristics
Dimensions: 935 x 330 x 310 mm (36.8 x 13.0 x 12.2″)
Weight: 188 kg (260 lbs)
To "integrate" capacity decay over time, I'd just take it as straight
line, allowing an average lifetime capacity of (100 - 70)/2
On 21.05.19 00:31, Chris Albertson wrote:
> On Mon, May 20, 2019 at 7:55 PM Erik Christiansen
> wrote:
>
> >
> > Switching normal loads is back to less than 100 A for less than 5 kW, but
> > still hard on contacts. (The contacts on the starter solenoid for an old
>
The hundred amps only flows from battery to inverter - and yes, the
cables are about half an inch in diameter, much like starter motor
cables in a car.
I'll be running low voltage DC for LED lighting, but that's at modest
current.
Erik
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a HRC fuse
in series to rupture the fault current. Otherwise, once a DC arc is
established, it could bridge a MOSFET package effortlessly, maintaining
current flow until enough copper flowed away to build a large gap.
Erik
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anels, it's a very interesting
variation in the cost/energy equation.
OK, reasonable efficiency is still necessary, especially in polar climes
in winter, but in generally sunny Australia, it's just the high initial
cost which detracts.
Erik
P.S. That web page is inordinately folk
to the difficulty of rupturing a
DC arc. Rather than bother with maintenance/replacement due to contact
deterioration after many switching cycles, I prefer to switch DC loads
with MOSFETs - they're easy to parallel, as the inherently share.
Erik
__
or. (I was going to do the latter
with a small spare 12v lead acid battery, but in the end fitted an even
smaller one into the existing battery compartment. It's adequate for the
small jobs I use the cordless for.)
A 13.8v LA charger was easier to make out of a spare plugpack than would
be a L
On 09.05.19 09:16, Gene Heskett wrote:
> Good thinking Erik. I suppose the next Q is how far down is it to the
> water table? And thats a job for a wind mill tower... But you knew
> that. What would be neat is a big remote switch rod running up the tower
> to a clutch to disconne
On 09.05.19 10:24, Dave Cole wrote:
>
> Erik,
>
> Do you have a blog going on your build?
Now that's an idea. All I've started is the seeds of an article for
"Owner Builder" magazine - the editor was interested when we last spoke.
> I'd be very intere
yor approval when I redrew the roof to
take a west-facing solar array to power the aircon in the afternoon,
after the sun has slid off the north-facing array. Kinda essential on a
43°C day, when you're off-grid. (It's too late to recharge the battery
for the night after you'
hange of views is not a priori a cause for changing
one's viewpoint. I recognise your preference. Mine is equally
steadfastly unchanged from the perfection of the original email format.
Erik
--
HTML is not email, and email doesn't contain HTML, so please turn HTML
formatting OFF in your ema
On 08.04.19 05:04, Gene Heskett wrote:
> On Monday 08 April 2019 02:36:49 Erik Christiansen wrote:
> > Granted, excessive quoting is too common on most lists. A good MUA
> > does much to ameliorate the issue, though. In mutt, 'S' skips quoted
> > text to the next bl
r to make
the post intelligible to those who do not read backwards - first, second,
or nth reading.
[fullquote elided]
Erik
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e or after.
A considerate poster chops out the stuff he's not answering, leaving a
"..." to indicate there's someone else's input left out of this part of
the discussion. The shorter the quoted text, the better. It is after all,
repetition of list traffic, and unnecessary verbi
On 26.03.19 07:10, Alan Condit wrote:
> Erik,
>
> Banggood is only one of the places selling the rock64. Look at Pine64’s
> website and google “rock64 stretch”
> There is an Armbian Stretch image available for download.
>
> Ala
Many thanks, Alan. That price is unbelievabl
ctice I get
> nanosecond level latencies.
>
> Perhaps everyone already is doing this and I was the last to think of it.
> The switch still actually bounce but in this case, bouncing does not cause
> a change of state.
No, the slow rise time, due to the pull-up timeconstant sees to tha
out RT.
When porting Linux to a new board, you're up for writing or borrowing
drivers for the BSP (Board Support Package) (= HAL in other lingo). I've
only started on that once, and never carried it through to completion.
Erik
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7;ll have to try that on one of my boards.
The size limitation on the free Eagle can be a bit of a nuisance,
though two layers do me so far.
Erik
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much less under the roof.)
Mind you, it's no hotter than a tile roof, is cool technology, and looks
splendid ... I'd only have to beef up the aircon.
Erik
¹ OK, only had one of those here this summer, but I'm on the coolest end
of the mainland.
___
erhaps?)
There's not much measurable difference between monocrystalline and
polycrystalline AFAICT.
Erik
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hope you manage to get the mail utility to work before long.
Erik
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ll lose around 22.5% of your 250 or 310W, or
whatever the wallet stretches to, on a 45°C day when the panels are at
70°C. Hmmm, they're all pretty much the same at the last link, above.
The panels can last 25 years, the inverter and battery about 10. It's
handy to not be f
allows the grid to substitute for a battery. In
that case, a physical battery is not yet fully competitive cost-wise.
But off-grid is another equation altogether, with a very positive
outlook.
Erik
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On 10.03.19 20:02, Marshland Engineering wrote:
> Hi Erik
>
> I know you are up to eyeballs at the moment, but here is a really interesting
> TED talk.
>
> https://www.ted.com/talks/allan_savory_how_to_green_the_world_s_deserts_and_reverse_climate_change#t-1320745
Either my on
t; It can work, the sun proves that.
It's just a bit difficult to build another one of those. (You can't get
the wood, you know. ;-)
Erik
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dislocation. We
will go through a rigorous learning process which will strip a lot of
delusions from folk who think the changes are temporary rather than a
harbinger of greater change to come. Our children will not thank us.
(Still, it might bring on peak population at a lower cou
On 09.03.19 22:06, Marshland Engineering wrote:
> Hi Erik
>
> Where do you live? Excuse me for being so ignorant on current news but I just
> don't watch it any more. Too much baloney !!! I can only assume California or
> Aus.
Victoria, Australia. (Dandenong Ranges,
d
> for a $10 investment and this includes $5k for the shipping to NZ.
I might become popular amongst the neighbouring farmers, but they don't
have any money as there's no rain these days, so it's damned hard to grow
anything.
Erik
_
xperimental lash up, perhaps with feedback taken off with a
toothed belt, could show whether it's worth investing further effort.
After all, to use the motors for anything, adequate mounting is needed.
Erik
P.S. No titillating pictures seen here, just motors. No time for dalliances
ei
On 19.02.19 07:32, Gene Heskett wrote:
> On Monday 18 February 2019 23:57:28 Erik Christiansen wrote:
>
> > On 18.02.19 22:47, Gene Heskett wrote:
> > > Already set true here Erik. Next? ;-)
> >
> > And it didn't take the lumpy URL when pasted whack in the m
On 18.02.19 22:47, Gene Heskett wrote:
> >
> Already set true here Erik. Next? ;-)
And it didn't take the lumpy URL when pasted whack in the middle of the
screen? (Dunno that I have any other magic settings. That one works
here.)
Erik
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It's the very best
tweak my browser has had, saving a pile of sweat over the years. (Picked
it up from John L. Fjellstad - can't remember which list.)
Erik
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On 16.02.19 11:47, Andy Pugh wrote:
>
>
> > On 16 Feb 2019, at 09:21, Erik Christiansen wrote:
> >
> > as lb/in^2 isn't right
>
> It can be, if you measure oil consumption in slugs.
True ... but then a slug is lbf s^2 / ft, and I have enough trouble
27;t right and it'll tell you.
(It does keep you on your toes, unit-wise.)
Erik
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from a crashed car should be abe to supply way
> more than 26 Kw.The weak link is going to be the inverter.
A number of inverter brands can be parallelled, sometimes using a separate
network connection to aid synchronisation or load sharing. Three 5 kW or
two 8 kW inverters would provide
e wall. We're limited in the
array oversizing allowed if we're on-grid, but off-grid it's a case of
anything the inverter is rated for. As a 6 kW array will only deliver 3
kW on a good winter's day, according to the boffins, I figure on passing
a f
"working pressure 15 - 50 PSI" and "Max pressure 25 PSI"
are true, then it's about 50 times better than the other. Dunno how it'd
handle one of your 6 hour convoluted gcode runs, though.
Erik
(Who's starting to look a
our end of the planet
are temporary. They're even more lethal, I figure. It's unfortunate that
they're pushed south by polar warming, as that's happening twice as fast
as the global average, so there'll probably be more of it in the coming
years.
Erik
___
again uninformed. It also came up in a search for "pdf", so may very
well be able to do the conversion for you. Worth a try, perhaps.
Erik
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000 km from the east coast to the west, so even being in the same
country isn't enough for it to be viable - especially as a return trip.
Erik
(Who survived the 45°C (113°F) we had on Friday - fortunately a peak for
hereabouts, though fairly common inland this summer, with peaks of 48.9°C
(120°
On 15.01.19 10:22, Chris Albertson wrote:
> On Mon, Jan 14, 2019 at 4:36 PM Erik Christiansen
> wrote:
...
> >
> > In reality, there's always more than one way to eat an elephant, so
> > there's no real need to complicate life by making backups a growing
>
the bricks shattering and Al engine blocks
running like water. California seems to be equally exposed to the
problem now, and elsewhere in the world catastrophic firestorms are
increasingly a foreseeable risk now.
Erik (Top temp in the state today: 46°C/114.8°F, a cooler 37°C/98.6°F here.
thout full
path, as it is now local. When moving about like that, the pwd command
will show where you are, or the prompt can be modified to include the
current working directory. (That's too much for now, though.)
Hope some of that is useful.
Erik
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w
idle kept him above the daffodils for many years afterward, till other
causes crept up, eventually.
Erik
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gid
tapping. (Gene uses them under CNC, IIUC - something I haven't tried.)
Erik
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y be signalled as such.
If sample files with netlists and addfs could be posted, then half a
page of awk can do the job, I believe.
Erik
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builders, without finding one who could
squeeze my build in, I've gone owner-builder, with all the time
consuming contractor chasing and leg-roping that entails - so no
promises, but sample text from which the list of outputs needs to be
scraped would be the first step toward a solution
On 26.08.18 04:51, Gene Heskett wrote:
> On Sunday 26 August 2018 03:14:42 Erik Christiansen wrote:
> > For small steppers, I'd rather spend half the money on a BED:
> >
> > https://www.sparkfun.com/products/12859
> >
> > which admittedly will only do 2
dmittedly will only do 2A, even if you stick a heatsink to the
top of the chip. But at least it responds to each step input given.
(I'm not sure if that's the Allegro chip which Gene shies clear of,
though.)
Erik
---
or
DC. I think I'd like to make the tool magazine linear, along the back of
the table, so as not to eat up table space. If the nut motor were
reversed for odd tool slots, then there's be no need for an idler gear
between slots.
Erik
---
ut as well,
avoiding the tool size constraint. But I'd want a retractable swarf
cover on that one.
Thanks for sharing. (I haven't dug that far back in hackaday)
Erik
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not entirely swallowed by the
arrestors. But I'd try to read up on that bit first. Grounded shielding
on external wiring has to help too.
Erik
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en
rriving here down under. But admittedly a 5 day gap since
then. That could just be meatspace priorities, what with summer on the
top half - that's a quiet time on a number of lists. (And down here, I'm
just back from a week on the farm
July 17th at that rate. Is it sending one payload byte per usb
packet, however many kB that is?
Erik
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engaging tech sites, Slashdot.org! http://
On 22.05.18 04:55, Gene Heskett wrote:
> On Tuesday 22 May 2018 00:51:08 Erik Christiansen wrote:
>
> > On 21.05.18 22:19, Gene Heskett wrote:
> Thanks Erik. Writing about this makes me think of better ways to do it.
Yep, thoughts can stay in a groove if not nudged. All that I w
bum end of a tap already aligned in a close-fitting bore, I figure.)
> Only about 50 more to go. :(
ISTR that you've made them all out of a bar of ¾" brass, so the one
centering ought to do for the lot? With an A axis to spi
s the $64 question.
You can get quite a few small center-drills for $64 - a lot less of the
medium & bigger ones. But ISTR that the good ones are cobalt steel, and
that's why they do fine even in SS, I find.
Erik
-
be two ball nuts working in opposition. If there is backlash on the $30
> screw it is less them by dial indicator can show.
Chris, do you have a link or targetted search term?
Erik
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On 11.05.18 07:42, Gene Heskett wrote:
> On Friday 11 May 2018 03:32:39 Erik Christiansen wrote:
> A box or three of grubscrews off fleabay won't add up
> > to much cost. The last boxful I bought was M3 to M10, IIRC. You might
> > do better buying plastic bags of
On 11.05.18 01:25, Gene Heskett wrote:
> On Thursday 10 May 2018 22:23:56 Erik Christiansen wrote:
> > But, whoa. I'm also not fully across the need for bore adjustment. As
> > taps are ground from a few stock sizes, only those few sizes of tap
> > hat bore are needed. W
I'd probably
make up a D-bit reamer, and keep it with the tap hat kit.
> Go stuff a weeks worth of pills into my pill-tainer, and maybe something
> will come to mind.
Here it's carting firewood for the winter closing in; 200 armloads
stacked up under the eaves, now that the fir
On 25.04.18 10:20, Jon Elson wrote:
> On 04/25/2018 04:48 AM, Erik Christiansen wrote:
> > As mentioned upthread, a linear regulator wastes power. But cheap
> > switchmode power supplies tend to radiate RF, and wipe out radio
> > reception in my remote rural location.
>
s (at least some of) the
LED lamps interfere overpoweringly with the radio.
Thus my design is based on real-world experience, and architected to
mitigate existing problems. It is not based on mere supposition.
Erik
--
Ch
breakers or fuses protect the wiring, rather than
the other way round, safety oughtn't be an issue. Nor will arcing, as
MOSFETs will do all the current control.
Erik
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ps I've designed, for ambience, but
omit ceiling lights in favour of higher wall-mounted angled uplights for
light off the ceiling. Oh ... may be able to design the uplights
into the top of the one wall lamp design ... where's that bit of paper?
Erik
---
> Thanks Erik. Some of the above I've not heard about till now, like the
> salt water battery. And its sounding like costs are coming down, just
> not fast enough to do me a lot of good.
The brand is Aquion, and there's a blurb here:
https://www.youtube.com/watch?v=1EhnmWo2
ome bits of Manuka burl are sketched in for wingtips on one design.
(With 1/3 of a microwave oven platter as diffuser, if I can cut 'em into
120° sectors.) Just need time, and either clear out the workshop here,
or build the one there.)
Erik
¹ Eucalyptus
-
e forgotten, but that's what's top of
mind ATM.
¹ Some reckon 12 kW is the go for off-grid, but they usually have a wife
and kids. I could go to 9 kW with 330 W panels instead of 250 W.
Erik
(Headed out to the farm on Wednesday, to push this thing along a little
bit. Have to have
You have: (8 A)^2 * 16m/(copperconductivity * 4 mm^2)
You want: W
* 4.4137931
/ 0.2265625
Beats using a sliderule.
Erik
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hp
* 5.9651634
/ 0.16764
The reciprocal conversion can be suppressed by invoking "units -1".
Erik
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On 10.04.18 07:59, Mark wrote:
> On 04/09/2018 11:37 PM, Erik Christiansen wrote:
> > I'll attach the files which Heinz sent, so none of us have to struggle with
> > the M$ .rar archive.
>
> Huh. Just downloaded the .rar fil from seeed and ran 'unrar e' on
On 09.04.18 13:29, andy pugh wrote:
> On 9 April 2018 at 04:37, Erik Christiansen wrote:
>
> > Having invested much effort in warping my brain to work with Eagle, I'm
> > reluctant to endure similar pain with Kicad.
>
> There may be more pain with KiCAD. It
On 09.04.18 08:19, Mark wrote:
> Erik,
>
> Got a linky to that rar file?
Yup, it's in the FAQ off Lawrence's original link, i.e.:
http://support.seeedstudio.com/knowledgebase/articles/422482-fusion-pcb-pcba-order-submission-guidelines
"DRU for 2-layer board" und
r_2-layer.zip, is
curious.)
Having invested much effort in warping my brain to work with Eagle, I'm
reluctant to endure similar pain with Kicad. In any event, it wouldn't
help with the boards I've done in Eagle.
Erik
-
c in a fresh
environment, it worked fine. Lesson: doubling up on ~/.bashrc can muck
things up in murky ways.
Erik
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On 07.03.18 05:45, Gene Heskett wrote:
> On Wednesday 07 March 2018 02:00:46 Erik Christiansen wrote:
> > To go in a collet, you wouldn't need the fat splined adapter to take
> > the die holder. I can take this one off as it's only held on with
> > grubscrew
on, but the little critters
didn't come when called - hold on, there's a couple of pics from when I
made 'em. Will send.
Erik
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was added for manual tapping. (I've yet to find
an adequate tap holder, and the die holder doesn't get in the way of the
plumbing hole in the top.)
The DIY path ensures you don't clutter the place with too many of 'em.
I&#
lear trend. --
The last rodent off a sinking ship will have the wettest pelt, despite
having to run the fastest. So long as our stuff is backed up elsewhere,
we won't go down with the ship, I figure. A contingency plan seems the
absolute minimum requirement at this stage.
Erik
--
an be on various media, at your choice. (4 different boot flows)
Does the method for one of those media look good to you? (The load offsets
for kernel and rootfs seem to be 0x8000 and 0x4 respectively, if my
quick scan is near the mark.) I
7;em, except as a kit to grind to tolerance,
chucking out the collets beyond rescue.
To attempt a rescue, maybe skim the chuck internal taper, then hone it?
The chances of making it worse are slim. If it works well, there's a
very handy youtube video in it.
Erik
--
On 22.10.17 10:44, Nicklas Karlsson wrote:
> On Sun, 22 Oct 2017 17:37:40 +1100
> Erik Christiansen wrote:
> > If you use a little RS485 Tx/Rx chip at each end, then that'll absorb 7v
> > of ground offset without further ado.
>
> Yes balanced signal RS485 is goo
30 nS pulse width, No Enables, 8-pin
(=> good to 10 Mb/s)
Balanced transmission between modules reduces EMI, and increases EMI
tolerance. Termination is 120 ohms - dead simple to use.
Erik
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