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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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.