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: Sites like Alibaba list "Interactive Staircase" systems and "Piano Music Stairs" for commercial or custom home use, often utilizing ground-projection or pressure-sensitive sensors.

: For a more budget-friendly approach, many homeowners use PIR motion sensors and LED strips to create a visual "piano" effect, or follow guides from Instructables to build their own sound-triggering system using Arduino and Raspberry Pi. The Melody of Midnight: A Story of Piano Stairs buy piano stairs

"It's the stairs," Leo explained, stepping onto the third tread. A soft, melodic Mi echoed. : Sites like Alibaba list "Interactive Staircase" systems