Sensors
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The coin cell problem
A sensor that has run out of battery does not tell you it has run out of battery. Why coin cells fail in the cold, why lithium matters, and why last-seen is a reading in its own right.
Nearly everyone starts here, and the honest answer is that a five dollar sensor is fine for most of what you want. Where it stops being fine is specific and worth knowing before you buy twelve of them.
A sensor that has run out of battery does not tell you it has run out of battery. Why coin cells fail in the cold, why lithium matters, and why last-seen is a reading in its own right.
Most people buy their second sensor for a reason and their first at random. What is actually worth watching in an RV, in the order it is worth spending money on, including what we cannot read.
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