I found a used hot tub online, that’s a couple of years old and I decided I can make a cool project out of it. The built-in controls were already annoying and time-consuming, so that gave me further reason to tinker with it. In order to save energy, I lower the pool temperature when not used, but if I wanted to use the hot tub, I had to turn the temperature up 4 hours in advance. As an example of what I mean by saying annoying: In order to save energy, I had to lower the pool temperature when not used, but if I wanted to use the hot tub, I had to turn the temperature up 4 hours in advance. Another thing that happened was that somehow the circulation pump decided to turn on randomly during the night – that would probably have gotten under control if I had read the manual, but as a tinker I prefer to tear out the controls and use a Raspberry Pi instead – so here’s my article “Open source hot tub controller.”
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