Sorry, newbie here without a Davis Pro. Is it because getting the data out into the weewx is inconsistent? or not working?
On Tue, 5 Mar 2019 at 15:27, Pat <p...@obrienphoto.net> wrote: > Impressive! I am using a Moteino and have a 2nd on "standby" as a backup. > I have 3 of the RTLSDR, so this could be something fun to try in my spare > time when I come across some of that! > > On Sunday, March 3, 2019 at 2:33:07 PM UTC-5, Luc Heijst wrote: >> >> Recently my attention was brought to a SDR tool for receiving wireless >> sensor data (TFA IT+ KlimaLogg Pro, LaCrosse, WeatherHub). See: >> https://github.com/baycom/tfrec. >> >> I wrote a weewx driver which parsed and stored the tfrec data of my 9 >> KlimaLogg sensors. The weewx driver can be found here: >> https://github.com/matthewwall/weewx-tfrc >> >> After this success I searched for a package that reads the radio data of >> Vantage Pro weather stations with a (cheap) RTL-SDR dongle and found: the >> rtldavis package on: https://github.com/bemasher/rtldavis. >> >> With this package were a few problems: >> 1. The development of the package stopped three years ago. >> 2. The set of European frequencies appeared not to be useful. >> 3. The package could only handle one transmitter (at a time). >> 4. The package is written in GO. Not a big issue, but the GO language is >> new for me. >> >> With two Vantage Pro2 systems, an anemometer station and a leaf-soil >> station the challenge was to get this package concurrently working for more >> than one transmitter (four in my case). >> >> With some modifications of main.go and protocol.go and trial and error I >> could find a reasonable set of the European frequencies which are used in >> the frequency hop sequence. >> The next step was to get the data of more than one sensor wich each its >> own hopping timing. >> The last step will be to parse the data packets and store the data in >> Weewx. This part is easy because this was already done by me via the >> parsing of the raw meteostick data in the weewx-meteostick driver, see: >> https://github.com/matthewwall/weewx-meteostick. >> >> The hopping mechanism has some prograss today. The principle is as >> follows. >> 1. Wait long enough on a fixed frequency until you have seen at least one >> message of each transmitter. For the five EU frequencies this process takes >> 17 seconds or less. For the 51 US frequencies this will take about ten >> times as much time. >> 2, Calculate with help of the lastVisitedTimes of all transmitters what >> the nextVisitTimes (in the near future) will be and how many hops would be >> needed to get here. >> 3. Detect the smallest nextVisitTime. This will be of the transmitter >> which follows first. >> 4. Calculate the hop channel for this transmitter. >> 5. Calculate the loopPeriod for this transmitter. In case the signal of >> this transmitter is missed we don't want to wait too long and miss packets >> of other transmitters too. >> 6. Start the hop process and wait for new data. >> >> I combined the weewx-sdr and weewx-meteostick drivers fr this weewx-rtld >> driver. >> The results so far: >> >> The first 1000 messages were read with the new driver. >> Average percentage of received signals is 94,8 %, see table. >> >> ok missed tot pctGood >> 341 19 360 94,7 >> 335 16 351 95,4 >> 324 20 344 94,2 >> ---- -- ---- ---- >> tot 1000 55 1055 94,8 >> >> The FreqError in general varies between -1000 and +1000. >> When abs(FreqError) > 10000 the weewx-rtld driver will restart program >> rtldavis. >> >> For a comparison between the Meteostick and rtld driver data see: >> http://www.lucdesign.nl/_weewx/bootstrap_rtld/hour.html >> >> There is one challence left: how to get local barometer data in my >> Raspberry PI? >> I could use a BMP280 pressure/temp sensor... so, more to come. >> >> Cheers, Luc >> > -- > 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. > -- Regards, Jude Mwenda -- 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.
