The PMW3901 is the bare PixArt chip used in many optical-flow modules (CXOF, Bitcraze flow deck, etc). SPI interface, ~$10 per chip. Useful for custom integrations where you want full control over the firmware; less useful for production where the CXOF module saves driver work.
Key practical considerations — minimum/maximum altitude, lighting requirements, floor contrast — are on PMW3901 limits.
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