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I²C address collision map
Every I²C part by address. Two parts at the same address cannot share a bus — you need a multiplexer, a second I²C bus on spare GPIOs, or a part whose address is strappable. Composite modules occupy several addresses at once; each one is listed. Plan the bus here before you order.
Build recipes
Bills of materials referencing catalogue parts by id. Totals are computed from each part's observed price at build time, so they cannot drift from the catalogue.