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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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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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What we are actually building, and why
We built this because we kept driving back to check on the dog. Everything about how the product works follows from that, including the parts that look like missing features.