JTK – Notes and Ramblings Things we have found …

The sdr stick we are using is the NooElec R820T.

Following the instructions from https://morioh.com/p/fd9b47cbc020 :

# install dependencies
sudo apt-get install libtool libusb-1.0.0-dev librtlsdr-dev rtl-sdr cmake

# clone rtl_433 Git Repository
git clone https://github.com/merbanan/rtl_433.git

# change to directory
cd rtl_433/
# make build folder
mkdir build
cd build/
# compile
cmake ../
# make
make
# install
sudo make install
# test if rtl_433 was properly installed
rtl_433 -h

After this we copied the udev rules from https://github.com/osmocom/rtl-sdr/raw/master/rtl-sdr.rules to /etc/udev/rules.d/rel-sdr.rules. This resolves the permission issue access the dongle when not root.

A test of rtl_433 then see the LaCrosse Technologies TX145WSDTH remote temp/humidity/wind speed/wind direction sensorthat came with the S81120 base station.

rtl_433 -F mqtt:<host>:1883 is enough to get things going to the mqtt broker on the destination machine.

Sample Output as seen on the destination PC using mosquitto_sub -v -t '#' :

rtl_433/jtk-garage/events {"time":"2020-03-31 16:31:10","model":"LaCrosse-TX141W                                                                                                                                                             ","id":303173,"channel":0,"battery_ok":1,"temperature_C":5.1,"humidity":75,"test                                                                                                                                                             ":0,"mic":"CRC"}
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/time 2020-03-31 16:31:10
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/id 303173
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/channel 0
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/battery_ok 1
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/temperature_C 5.1
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/humidity 75
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/test 0
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/mic CRC
rtl_433/jtk-garage/events {"time":"2020-03-31 16:31:10","model":"LaCrosse-TX141W","id":303173,"channel":0,"battery_ok":1,"wind_avg_km_h":3.5,"wind_dir_deg":351,"test":0,"mic":"CRC"}
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/time 2020-03-31 16:31:10
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/id 303173
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/channel 0
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/battery_ok 1
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/wind_avg_km_h 3.5
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/wind_dir_deg 351
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/test 0
rtl_433/jtk-garage/devices/LaCrosse-TX141W/0/303173/mic CRC

Now we can edit the openhab files to make use of this info…