I've settled on a decent sensor that is a small improvement over the old design. Its the MLX75306. Prototype #1 was a kludge of an Arduino pro micro, breakout boards, and a messy perf board, but it replicated the existing design. The latest prototype #2 fits on the existing board real-estate. Some improvements so far:
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AuthorMaker of the Filament Sensor and other curious gadgets Archives
October 2021
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