Refrigerator Sensor and Gas Meter Reading with rtl_433 and cheap USB rtl-sdr tuner

Just configured temperature readings and utility meter readings using the SDR tool rtl_433 (note: need later version which has mqtt, I’m using 20.11) with a cheap USB tuner (I have a Terratec Cinergy ~ $10) which is a huge improvement over my prior config using rtl_sdr.

I simply run on either my router or raspberry pi:

rtl_433 -R 149 -R 41 -f 433920000 -f 912600155 -H 420 -F "mqtt://,user=homeassistant,pass=password,retain=0,devices=rtl_433[/id]"

which hops frequencies at the interval of 420 s to collect both signals and sends readings to HA via MQTT.

Then have sensor in HA collected with:

  - platform: mqtt
    state_topic: "rtl_433/40000573/consumption_data"
    name: "Gas Meter"
    unit_of_measurement: CCF
    value_template: "{{ (value | float)/100 }}"
  - platform: mqtt
    state_topic: "rtl_433/52140/temperature_F"
    name: "Fridge Sensor1"
    unit_of_measurement: F

Very satisfying :slight_smile:


Way interested in this. Thanks for posting. What make/model gas meter do you have? I’m trying to figure out what tech and frequency my meter uses.