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SPI Bus Cable Length – nRF24 - Damogran Labs
There was a game called Labyrinth Ljubljana, and part of its technical solution was a Control Unit which controlled our custom made flashlights over RF link with cheap chinese module with nRF24L01+ onboard. We need to cover (one way: Control Unit -> Flashlights) an entire Labyrinth house (a stall actually), about 500 m2 in two floors