Using std::span in Modern C++

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How std::span makes pointer-plus-length APIs easier to review, where it fits in firmware and tools, and which lifetime, bounds, DMA, and toolchain issues it still cannot protect.

Free PCB Design Software for Beginners and Hobbyists

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A practical comparison of free PCB design tools, with attention to workflow, libraries, manufacturing output, privacy, current free-tier constraints, and the mistakes that usually hurt first boards.