Hi Colin,
I had those experiences as well (including permanently damaged SD
Cards and PC's damaged by lightning strikes) and now have all IT
equipment on a UPS. The 1-wire controller will be part of a home
automation server and won't be remotely installed - it will be in the
study on a UPS.
Regards
Joe P.
On 13/12/17 11:43, Colin Reese wrote:
WRT power, USB power is still an issue, especially over long period
with fluctuating power. I use a power-management board and battery
backup for this reason. Non-graceful shutdowns not only corrupt the
operating system, but also potentially the SDCards permanently. This
is a bad situation, obviously, exacerbated for remote installations.
C
On 12/12/2017 5:34 PM, joep wrote:
Thanks again Jan.
>>> $ owserver --i2c=/dev/i2c-0:ALL
That answers my most pressing question.
>>>I'm talking about the Raspberry Zero W, which has a built-in SDIO
WLAN
adapter and a built-in antenna. No fiddling with USB needed (though USB
power isn't much of an issue anymore since the Raspberry B+).
I understood your initial suggestion re the Raspberry Zero W. My
suspicion is that WiFi is flaky irrespective of the host controller -
I've had issues with name brand WiFi units on name brand PC's. I
suspect WiFi (and it's drivers) is designed for shortish-term
connections - not long ones lasting months. Ethernet seems to fare
much better.
Regards
Joe P.
On 13/12/17 11:08, Jan Kandziora wrote:
Am 12.12.2017 um 22:38 schrieb joep:
Jan thanks for the reply.
I currently have 2 Raspberry Pi's (of late 2012 vintage - forgot the
model ID's) and I've been running them since early 2013. I've run
one for 6 months non-stop (to manage the lighting and temperature in
a terrarium) and only stopped it to update the Raspbian firmware. I
use the "Blue DS9490R unit" (Dallas call it a DS9490R) to drive the
1-wire network. On of the main issues I found with operating the Pi
with WiFi connectivity is the WiFi connectivity - seems to be a bit
flaky (maybe the drivers for the specific WiFi unit - the WiFi was
not powered directly from the Pi but from a USB hub)
USB power on the original Raspberries was a source of constant
misfortune. And USB hubs often enough do, too.
So I don't
think I'll chose a Raspberry B Zero W for long term stability
reasons.
I'm talking about the Raspberry Zero W, which has a built-in SDIO WLAN
adapter and a built-in antenna. No fiddling with USB needed (though USB
power isn't much of an issue anymore since the Raspberry B+).
The system I'm thinking of building is for a home server and will use
a low-end laptop as I do not have to wire the basic infrastructure to
get a computing environment happening (power supply, screen,
keyboard, memory, case) - it's all setup already. All I'll need is a
USB-to-I2C-to-1_wire.
If I'm to use a USB-to-I2C adaptor (say FT232H) to drive a I2C
1-wire master (say a DS2482-800) how should I initialize OWFS?
sudo owfs –d=/dev/i2c-0 /mnt/owfs ? or
sudo owfs –u=/dev/i2c-0 /mnt/owfs (manual says this option is for a
"USB adapter (DS9490) as 1-wire bus master") ?
Please don't use the owfs binary. It has an unsolvable race condition.
Use owserver and access it through the owwrite, owread, owdir, owget
shell tools or through one of the language bindings.
$ owserver --i2c=/dev/i2c-0:ALL
Kind regards
Jan
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