Hardware

Clinical-grade signals from a pocketable bill of materials.

Acquisition chain

• MCU: ESP32 with Bluetooth Low Energy streaming
• Analog front-end: BioAmp EXG Pill (single-channel biopotential)
• Electrodes: dry, no-gel, placed in under 2 minutes
• Sampling: 256 Hz, continuous streaming to the mobile app

Firmware

PlatformIO-based firmware in firmware/ handles sampling, impedance hints, packet framing and BLE GATT streaming. Udev rules ship for Linux flashing.

Mobile link

The React Native app (apps/mobile/) manages BLE pairing, voice-assisted recording flows, role-based access (patient / caregiver / clinician) and upload to the backend (apps/backend/) for scoring and longitudinal tracking.