Temperature
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The temperature check you cannot make from a trailhead
A parked RV on a mild day can reach a hundred degrees inside an hour. This is the maths of that, and what monitoring does and does not solve.
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Two thresholds and a clock
A rig at 82 and holding is a different animal from one that was at 74 twenty minutes ago. Nothing measures a slope, so two thresholds and the gap between them are how you read one.
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Setting up a Govee H5075 for RV monitoring
The cheapest way into RV monitoring is a sensor you can buy anywhere. Here is what the H5075 broadcasts, what we read from it, and the one setting that stops it working.
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Put a bottle of water in the fridge and watch that instead
An air sensor in the fridge alerts on every door opening. A probe in a bottle of water alerts when the food is actually warming, which is a different and much more useful thing. Five methods, and what each one cannot see.
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Flashing a Xiaomi LYWSD03MMC, start to finish
The cheapest sensor worth owning needs fifteen minutes of setup before any hub can read it. It is done from a browser, it is hard to break, and here is every step.