Is Your Refrigerator Running?
Most Internet of Things devices have a pretty simple job. They take a sensor reading, send it off to a server somewhere, then immediately forget that it ever happened. If you want to know what the temperature was 20 minutes ago, that is the cloud's problem. This approach works, but it also means sending a constant stream of data over the network and maintaining a remote database just to give a tiny sensor a memory.
Hunter McGuire recently demonstrated that there is another way to think about this. He built a refrigerator monitor that keeps its own history, analyzes that data locally, and only sends the cloud a summary of what has been happening. If more information is needed, the raw historical data can be requested from the device. All of this runs on a Seeed Studio XIAO ESP32C3 that costs about $5.
The XIAO ESP32C3 is a tiny, 21...
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