2 ms·
I have an RTL-SDR that collects sensor data via rtl_433 [0] and publishes it to MQTT, which I use for temperature and contact sensors. I found it interesting th
by gregmac 4y ago
I have an RTL-SDR that collects sensor data via rtl_433 [0] and publishes it to MQTT, which I use for temperature and contact sensors. I found it interesting that I pick up a fair amount of TPMS data from (what I presume are) people driving by.
{"time":"2022-08-03 08:25:13","model":"Schrader","type":"TPMS","flags":"ab","id":"555551E","pressure_kPa":267.5,"temperature_C":57.0,"mic":"CRC"}
{"time":"2022-08-06 04:53:23","model":"Schrader","type":"TPMS","flags":"d5","id":"2F656AA","pressure_kPa":585.0,"temperature_C":120.0,"mic":"CRC"}
{"time":"2022-08-06 06:15:29","model":"Schrader","type":"TPMS","flags":"af","id":"4BAAC5B","pressure_kPa":227.5,"temperature_C":35.0,"mic":"CRC"}
{"time":"2022-08-08 10:24:43","model":"Schrader","type":"TPMS","flags":"af","id":"553AAD5","pressure_kPa":232.5,"temperature_C":120.0,"mic":"CRC"}
{"time":"2022-08-08 10:35:39","model":"Schrader","type":"TPMS","flags":"5a","id":"AAB8576","pressure_kPa":452.5,"temperature_C":43.0,"mic":"CRC"}
{"time":"2022-08-08 10:58:22","model":"Schrader","type":"TPMS","flags":"ad","id":"6FF5667","pressure_kPa":427.5,"temperature_C":56.0,"mic":"CRC"}
{"time":"2022-08-09 21:34:49","model":"Schrader","type":"TPMS","flags":"6a","id":"BAD22B2","pressure_kPa":212.5,"temperature_C":132.0,"mic":"CRC"}
{"time":"2022-08-09 23:31:35","model":"Schrader","type":"TPMS","flags":"6a","id":"AB5E5B6","pressure_kPa":545.0,"temperature_C":163.0,"mic":"CRC"}
{"time":"2022-08-10 16:49:55","model":"Schrader","type":"TPMS","flags":"57","id":"B56AED6","pressure_kPa":427.5,"temperature_C":36.0,"mic":"CRC"}
{"time":"2022-08-11 00:58:24","model":"Schrader","type":"TPMS","flags":"ab","id":"DF44AAB","pressure_kPa":452.5,"temperature_C":187.0,"mic":"CRC"}
{"time":"2022-08-11 01:36:15","model":"Schrader","type":"TPMS","flags":"aa","id":"AB55552","pressure_kPa":432.5,"temperature_C":35.0,"mic":"CRC"}
{"time":"2022-08-13 08:27:24","model":"Schrader","type":"TPMS","flags":"54","id":"5555553","pressure_kPa":425.0,"temperature_C":120.0,"mic":"CRC"}
{"time":"2022-08-16 10:48:29","model":"Schrader","type":"TPMS","flags":"aa","id":"B552AAA","pressure_kPa":425.0,"temperature_C":123.0,"mic":"CRC"}
(Note: IDs munged just in case they're sensitive). I can't speak to the quality of data -- for what it's worth I do live on a regional road with a high speed limit, so it's understandable there would be some hot tires. However theses could also just be poor quality sensors, bad signals, or bugs in rtl_433.
Even aside from the obvious things like carrying around and using apps on a cell phone, it's amazing to realize how much information everyone leaks just going about their day. I've not investigated anything about how frequently or reliably these signals are sent, but it does seem feasible this could get used for vehicle presence detection or even short-range tracking.
[0] https://github.com/merbanan/rtl_433 https://github.com/merbanan/rtl_433