Hi everyone,
I’m looking for a hardware solution to monitor the temperature inside my car and ideally integrate it into Home Assistant.
The car is a VW Golf 8.5 GTE, and I would like to place a small temperature sensor somewhere inside the vehicle.
The main problem is that the car is often parked outside the range of my home Wi-Fi, Bluetooth or Zigbee network. So a normal Bluetooth, Wi-Fi or Zigbee temperature sensor would not really help.
What I am looking for is something that can transmit the temperature independently, for example via:
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LTE / 4G / 5G
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LTE-M / NB-IoT
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LoRaWAN, if that would make sense
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or another cloud-based/mobile solution
Ideally, the device should be:
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battery powered or rechargeable
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small enough to leave permanently inside the car
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able to work for a reasonably long time without charging
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able to send temperature readings even when the car is far away from my home network
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somehow accessible from Home Assistant, for example via MQTT, REST API, cloud integration or another workaround
I do not necessarily need very frequent updates. A temperature reading every 10–30 minutes, or even less often while the car is parked, would probably be enough.
Has anyone built something similar or knows suitable hardware for this?
I would also be interested in DIY solutions, for example ESP32-based hardware with an LTE-M / NB-IoT modem, as long as power consumption is reasonable.
Thanks!
