We have now created a thermostat that exists as an Arduino prototype while the Python program runs from your computer. This prototype is still nowhere near a deployable or mobile state due to the connected computer, and the display monitor if you are using a desktop computer. A real-world thermostat device should have a small footprint, portable size, and miniature display to show limited information. The popular and practical way to achieve this goal is to use a small single-board computer that is capable of hosting an operating system and hence providing the essential Python programming interface. For this stage of the project, we will be utilizing a single-board computer—a Raspberry Pi—with a small LCD display.