Let’s see what a rtl_sdr can catch around the public 433 MHz frequency, where many devices operate.
Download and install from https://github.com/merbanan/rtl_433
Tire pressure monitors
{"time" : "2020-01-29 15:41:17", "model" : "Ford", "type" : "TPMS", "id" : "45702d86", "code" : "92c846", "mic" : "CHECKSUM"}
{"time" : "2020-01-29 15:41:33", "model" : "Renault", "type" : "TPMS", "id" : "8daa8d", "flags" : "30", "pressure_kPa" : 182.250, "temperature_C" : 17.000, "mic" : "CRC"}
{"time" : "2020-01-29 15:45:08", "model" : "Toyota", "type" : "TPMS", "id" : "f15ec932", "status" : 131, "pressure_kPa" : 225.803, "temperature_C" : 9.000, "mic" : "CRC"}
{"time" : "2020-01-29 15:45:29", "model" : "Schrader", "type" : "TPMS", "flags" : "07", "id" : "203635C", "pressure_kPa" : 250.000, "temperature_C" : 15.000, "mic" : "CRC"}
{"time" : "2020-01-29 15:45:46", "model" : "Citroen", "type" : "TPMS", "state" : "df", "id" : "c0b3ee72", "flags" : 0, "repeat" : 11, "pressure_kPa" : 133.672, "temperature_C" : 20.000, "maybe_battery" : 97, "mic" : "CHECKSUM"}
{"time" : "2020-05-24 20:07:28", "model" : "Renault", "type" : "TPMS", "id" : "91cfba", "flags" : "36", "pressure_kPa" : 252.000, "temperature_C" : 21.000, "mic" : "CRC"}
{"time" : "2020-05-24 20:07:30", "model" : "Renault", "type" : "TPMS", "id" : "63a857", "flags" : "36", "pressure_kPa" : 253.500, "temperature_C" : 19.000, "mic" : "CRC"}
{"time" : "2020-05-24 20:07:56", "model" : "Ford", "type" : "TPMS", "id" : "4588727f", "code" : "87c446", "mic" : "CHECKSUM"}
{"time" : "2020-05-24 20:08:01", "model" : "Schrader", "type" : "TPMS", "flags" : "07", "id" : "2057F12", "pressure_kPa" : 287.500, "temperature_C" : 24.000, "mic" : "CRC"}
{"time" : "2020-05-24 21:00:16", "model" : "Toyota", "type" : "TPMS", "id" : "d1f8323d", "status" : 130, "pressure_kPa" : 265.448, "temperature_C" : 19.000, "mic" : "CRC"}
{"time" : "2020-05-24 21:00:16", "model" : "Toyota", "type" : "TPMS", "id" : "d1f8323d", "status" : 131, "pressure_kPa" : 265.448, "temperature_C" : 19.000, "mic" : "CRC"}
Access systems
model : Akhan 100F14 remote keyless entry ID (20bit): 0x25517 Data (4bit): 0x1 (Lock) {"time" : "2020-01-30 14:30:48", "model" : "Microchip-HCS200", "id" : "03EED500", "encrypted" : "5BD25DE7", "button1" : "ON", "button2" : "OFF", "button3" : "OFF", "button4" : "OFF", "misc" : "", "battery_ok" : 1}
Other devices
{"time" : "2020-01-30 14:59:23", "model" : "Smoke detector GS 558", "id" : 600, "unit" : 20, "learn" : 0, "code" : "c04b14"} {"time" : "2020-01-29 15:51:08", "model" : "Oregon Scientific SL109H", "id" : 0, "channel" : 3, "temperature_C" : 0.000, "humidity" : 0, "status" : 0, "mic" : "CHECKSUM"}