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 values. 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: http://sailing.mit.edu/weather/ 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. m -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.