Sprout is a drop-in replacement motherboard for iPod 3rd‑gen, 4th‑gen, and iPod mini that keeps the original case, monochrome LCD, and click wheel while modernizing the internals. It replaces the aging logic board with a new RP2350-powered design, adds Bluetooth for AirPods and other headphones, Wi‑Fi, USB‑C charging and digital audio, a Cirrus Logic CS43131 hi‑fi DAC on the original 3.5 mm jack, and a microSD slot supporting up to 2 TB. The firmware recreates the classic clickwheel interface, including Cover Flow, search, and podcast support, and aims for long battery life (target ~40 hours on 3G/4G with a 2,500 mAh cell, ~20 hours on mini with 1,200 mAh).
Two versions are offered: Sprout Pico, driven by the RP2350 microcontroller for local playback of MP3, AAC, ALAC, FLAC, and Opus files; and Sprout Pi, which adds a Raspberry Pi Compute Module Zero to enable streaming from Spotify and Apple Music, AirPlay, podcasts, and custom apps. Installation requires only basic tools and reuses original ribbon cables; no soldering is needed. All hardware and software are open source (CERN‑OHL‑S v2, MPL‑2.0, CC BY 4.0) with files planned for GitHub, and working proofs of concept exist though streaming service availability at launch may vary due to API changes.
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