Smart Chair V1: ESP32-C3-based seat-occupancy and posture sensing hub with 4× FSR channels and IMU over I2C, featuring corrected USB-C power wiring with TVS protection, remapped I2C on IO4/IO5 with pull-ups, dedicated PROG_TX/PROG_RX/BOOT/EN test pads, and antenna keep-out zone #consumer-electronics #BLE #I2C #USB-C #IoT