Another approach to the multiple sensor setup is to use a hub and have
each sensor, or group of sensors on a different channel. You could do
this with a Raspberry Pi and Sheepwalk RPI3 + RPI3a adapter to give you
8 separate channels.
http://www.raspberrypi.org/
http://www.sheepwalkelectronics.co.uk/products-adapters.shtml
Mick
On 09/12/13 16:02, Vajk Fekete wrote:
this case, if the wiring shorts, it will kill all sensors. u will have
to find out which is the bad one, unconnect it, and then you can
continue.
also to notethat likely they will fail in proportion if time, so if
all are same, they will fail about the same time.
Vajk
On Mon, Dec 9, 2013 at 4:29 PM, Jerry Scharf
<[email protected]
<mailto:[email protected]>> wrote:
I think you may have a misunderstaning of the way these sensors
work. One adapter can cover many sensors. As I said, you only need
to the long run to a connection box near the water, then connect
the sensors serially inside the box.
jerry
On 12/09/2013 01:35 AM, Håkan Elmqvist wrote:
Thanks all for your tips.
I will try some of them. Multiple sensors is a good solution but
requires multiple adapters and cables.
H
2013-12-09 00:15, Michael Markstaller skrev:
On 08.12.2013 21:31, Håkan Elmqvist wrote:
I have for some years monitored sea water temperature with DS1820s and
OWFS.
I have some in saltwater for about 4y now without failure.
But to be able to give any meaningful answer: it is very important to
know the salinity and temperature of the water you measure - it's a big
diffenrence for so called "stainless steel" (or however its called like
V4A, ..) i.e wether the saltwater has 10 or 28°C!
But one thing ahead: copper gets eated by saltwater due to electrolysis
if the material in between is conducting - very quickly!
Define your needs, maybe a solution is near but not with materials you
find on land ;)
Michael
--
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