Arduino and Raspberry Pi are wonderful platforms for DIY projects. You can always learn from thousands of projects already online. Take this Raspberry Pi-powered Radio Time Machine by user alexis__reddit for instance: it covers 100 years of music from 1920s to 2020. Each decade has its own Spotify playlist.
More gadgets like this: here
For this project, a vintage Bluetooth radio was combined with a Raspberry Pi 4, Arduino Nano, LEDs, and a button. The project is based on Mopidy library.
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