120. Precise Wattage Control Changes Everything for Bitcoin Mining

In this episode, we sat down with 256 Foundation developer Schnitzel to dig into the latest breakthroughs happening around open-source Bitcoin mining firmware, Mujina. We talked through how recent work on Mujina is unlocking support for Antminer S19j and S19k hashboards, including mixed-board setups running on a single control board. Schnitzel shared what it has been like collaborating with AI agents to rapidly prototype new features, from board detection and fan safeguards to thermal protections and faster frequency ramping. A big theme throughout the conversation was that the modular architecture of Mujina is what makes this kind of experimentation possible, and why open source is such a powerful accelerant for both human and AI-driven development.We also spent a lot of time exploring a practical new use case: matching miner power draw to excess solar generation with precise wattage control. Schnitzel explained how he and collaborators are building a system that can dynamically tune miners to hit exact power targets in seconds, rather than relying on rough estimates or slow reboot-based scaling. We discussed the implications for home mining, grid-responsive mining, and larger industrial deployments, as well as the importance of stress testing, hardware experimentation, and community contributions to keep pushing the frontier forward. The episode closes with a look at where this work is headed next, including per-chip tuning, expanded control board support, and the long-term vision for a broader open-source mining ecosystem.