On Fri, 5 Mar 2010, zapinio wrote:
> It can be used for free ONLY for slaves of Dallas origin. It is patented and
> selling of third party slaves was (is?) not accepted by Dallas/Maxim.
Those patents must be close to expiring by now?
notes about reliability agreed
't have an old
> usb mouse or KB they can scavenge the cable from?)
Yep, or someone could make a business selling them :)
So are there any shortcomings of existing adapters which would be worth
addressing?
njh
even
likely to buy more: I can imagine buying your premade 1w slaves and
flashing new features onto them.
njh
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> Would this be interesting? Is there a datasheet on the 2490 usb
> interface? Owfs supports it, so I should be able to get what I need
> from the source code, worst case
The 2490 only cost me $16, but I think this is interesting because it
rem
ds which would fit nicely in
the owfs model. My only concern is scope creep. Are there any comparable
libraries for other sensor-like devices?
njh
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be useful
for other applications.
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On Thu, 29 Oct 2009, Zoff wrote:
is costs 70 euro, but it's working for me since august without any problems.
and it reads temperature also, with 1/8 °C accuracy.
No, it reads with 1/8 C precision. The accuracy is claimed as +/-0.5C
after calibration. (see page 6 of data sheet)
or git?
njh
On Thu, 12 Mar 2009, Gregg C Levine wrote:
Hello!
Paul, how difficult is it to setup an SVN storage arrangement?
The point being, what happens if we need to setup a whole new revision
control service storage setup? For me I can either pull something from SVN
far easier then from
On Mon, 2 Mar 2009, William Brown wrote:
> Can you provide a link? I too am interested.
http://www.google.com/search?q=hall+effect+current+sensor
The allegro units are good.
njh
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The hall effect based ones are safer for large currents (such as in a
PV system) because they are isolated. You have to be careful with shunts
to avoid ground loops.
njh
On Mon, 2 Mar 2009, William Brown wrote:
> If you can't find exactly what you need try a shunt with a hobby board
On Wed, 25 Feb 2009, Paul Alfille wrote:
> I don't know of any ports, yet, but it looks very enticing.
>
> There is a writeup on Linux Devices as well.:
> http://www.linuxdevices.com/news/NS9634061300.html
On Wed, 31 Dec 2008, Jaap Struyk wrote:
> That sounds quite good, I will give that a try later this year when I
Hehe, better hurry up!
njh
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in one solar (PV) controller
the flash card died from the heat.
> Anyway it was at least the price of the thing from Acer, (US prices not your
> AUD amount Robert.) that through the on the idea. Until your
> suggestion NJH I decided to some how create my own design admittedly
> surr
I use JrSXs, at $90 from http://www.norhtec.com/products/mcjrsx/index.html
they use 2W, use any 5V supply, have serial and USB ports and run linux
off a compact flash card trivially. They have ethernet and svga.
njh
On Tue, 18 Nov 2008, Mr Robert Conway wrote:
> Was recently looking at
fect
as a variable speed pump by just having a reservoir at the top with a
V-shaped outlet, and modulate the pump at a frequency higher than the
empty rate.
A digital water level meter makes this easy to implement.
njh
On Sat, 8 Nov 2008, Mike Zimmerman wrote:
> looking for what 1-wire har
he load is 10A * 24V (240W) you'll be dissipating 120W *
2ms = 0.5J. This should be fine with a reasonable heatsink, at the speeds
you can drive 1-wire.
(If you take this route, your power supply needs to be able to float with
the 1-wire ground, off the shelf double insulated switchmo
nd feed it to a
1w adc, you might also be able to use the dual counter module to replace
the pic.
You might want to shield the sensor from any platypuses or eels to prevent
the sense signal from upsetting them.
njh
On Wed, 8 Oct 2008, Ziggy wrote:
> A little late to the party here, b
unch of tested designs here:
http://njhurst.com/electronics/watersensor/new/
njh
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>
> On the plus side, even if it now proves to be incorrect, it's a godo
> thing to have (mis)learned. ;-)
One question is why the system wasn't designed around standard cables in
the first place - perhaps even cat5/rj45.
s of
> devices.
DS2482 works for me.
njh
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lly, they are exactly the same - the second is just evaluated with
horner's scheme, which is faster and more numerically stable.
In your example a0=c3, a1=c2, a2=c1 a3=c0
http://en.wikipedia.org/wiki/Horner_scheme
njh
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This
tion here in NY.
I would run a separate power up, make sure the supply is floating - don't
form a loop in the power and signal grounds. You can fairly easy dumpster
dive for 5V small output switchmodes in the 10W range.
You can test the usefulness of the idea with a 5V battery supply u
.
No idea, but I just used some LEDs as minisolar panels and a resistor to
make it a current source. The current from an LED is very nearly
proportional to the number of photons.
njh
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This is an obvious thing, but have you tried putting a capacitor right on
the power supply leads to the chip? 0.1uF bypassing cap should do the
trick I think?
njh
On Mon, 1 Oct 2007, Jim Kusznir wrote:
I got an EE to bring over an OScope, and we may have found out some more info.
First
converters in the past, never could work out
why :(
njh
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You can
of course get them as samples directly from maxim-ic.com. If they're
experienced enough to solder up a Max232 with its various tantalum caps,
soldering a DS2450 is going to be a doddle.
Then there is the i2c m
ed a DS2480 directly you can connect to TTL level signals
avoiding two max232 type level shifters. The DS2480 has a polarity select
pin which allows you to ensure the phase is correct.
http://www.maxim-ic.com/quick_view2.cfm/qv_p
You want SVG and javascript:
http://www.browserland.org/scripts/svgclock/
(And possibly xmlrpchttp or whatever it's called this week)
That's the standards compliant way to do it :)
njh
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given a reasonable dwell time and a
reasonable flow rate the moisture level in the wood and the air should be
strongly connected. There will be a temperature dependence.
njh
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with an endless loop, poll, sleep a second, poll ...
> Other tasks will run during the sleeping automatically.
If you want to watch a bunch files that you are adding to elsewhere you
can use select so that you are woken when
On Tue, 15 May 2007, Matthias Urlichs wrote:
> Hi,
>
> Quick note: I'm working on Debian packaging for owfs.
Could you do ubuntu while you're at it? Otherwise, send me the debian dir
and I'll do it.
njh
-
gt; OWFS by connecting the DS2480B to the serial port and using
> a more traditional approach. As I understand from the
> datasheet the DS2480B runs at 5V but it can understand 3.3V
> "TTL" serial ports.
On Fri, 27 Apr 2007, Matthias Urlichs wrote:
> Hi,
>
> njh:
>>> # owread -s localhost:4304 /1F.BCC60400/aux/1D.82EA0900/counters.A
>>> Data error on /1F.BCC60400/aux/1D.82EA0900/counters.A
>>> #
>>>
>>> What gives? The
#
>
> What gives? The bus is OK -- it's quite short, non-branched, and other
> devices work perfectly.
Do you have any other counters? Could it be a dud chip?
njh
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ut these can be read into owfs just like hubs.
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errupt to handle data (rather than
reading from shared memory as with the 2404) and requires another layer of
checksumming. The 2404 based approach was very elegant (although allowing
bus mastering would make it the ultimate low cost sensor/actuator
networking interface).
I don't suppo
urse it is actually deamonizing itself).
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-wire sensors daisychained off
it and these sensors could also be read directly from a PC.
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o this bug report:
http://www.nabble.com/usb_bulk_write-and-2.6.19-t3352734.html) but I'm
fairly sure it's libusb and not fuse.
usbview on faulty kernels shows the device as unknown,
DS9490 then usbfs on working systems.
njh
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