Demo: OpenCSI: A Self-Calibrating, Cross-Hardware WiFi Sensing Mesh

A live booth version of OpenCSI, built so that attendees can see a calibration layer at work rather than read its numbers. An ESP32 mesh senses the space in front of the table, and a real-time dashboard shows the mesh topology, each link’s calibration maturity as its baseline forms, and the occupancy decision as a visitor steps into the sensing volume. The centerpiece is a physical hardware swap: the mesh is rebuilt from ESP32-C6 to ESP32-S3 nodes, changing chip generation, band, and PHY format, and the same unchanged classifier keeps detecting occupancy with no retraining and no labelled data from the new hardware. Unplugging a node or moving a chair then breaks calibration on purpose, and the dashboard flags the stale links instead of failing quietly. Where most WiFi sensing demos show a downstream task on fixed hardware, this one exposes the layer beneath, and makes cross-hardware transfer observable through a live swap rather than reported metrics.