On Friday, April 6, 2018 at 9:38:09 AM UTC-4, shane turner wrote:
> Hello all
> I have an accurite that is currently set up on a dock sending data to
> greyscale receiver in the house.It then goes into pi via weewx and then to
> the web.
> I would like to add saltwater temp. Could I hack up an old accurite system
> that had been broken in storm as I would only need temp, no wind ect..? ..
> Then solder in a sensor and drop it off my dock and have it send data to a
> second accurite receiver. At this point would I need a second piece or can
> I run 2 usbs on 1 pi with weewx then out to wunderground ect?
if you put two usb acurite consoles on a pi, you will not be able to tell
the difference between them. there is no serial number in the acurite usb
info, so no chance of writing a udev rule. you would have to probe each
console for data, then distinguish based on the actual temperature/wind
you might be better off buying a acurite bridge (aka smarthub). they are
discontinued now but should be available for about $40. an acurite access
could work too, but that would be a waste of money imho ($120). the bridge
reports the sensor's serial number, so you could use a single bridge to get
data from two or more 5-in-1 or tower sensors.
or you could just get an SDR dongle ($20) and grab the data directly from
the sensor cluster.
> Additionally what is a good sensor that won't attract barnacles?
pretty much anything you put in saltwater will end up with stuff growing on
it. freshwater too, but different critters :)
we use one-wire temperature sensors for this - they cost about $1 each,
potted in a stainless can. search for DS18B20 on amazone or ebay. then
you will need a 1-wire interface such as a usb-to-1-wire adapter. to
collect data, use the weewx-onewire extension as a service or as a driver.
that is how we measure water temperature here:
no barnacles, but it is briney with lots of slime and algae. you can paint
the sensor with a hard or ablative bottom paint. that should not affect
the temperature readings much.
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