FOT Respiratory Sensor Device
A device that measures lung impedance during non-invasive ventilation using forced oscillation — to help titrate ventilator pressure for COPD patients.
My role
PCB design · firmware · SolidWorks CAD · sensor selection & analog-vs-ADC analysis · Flask dashboard
Sensors
Dual Honeywell HSC — airway pressure (±10 inH₂O) + flow (±2 inH₂O), analog
PCB
2-layer FR-4, 26×40 mm · JST-XH connector · 0 DRC errors · ordered from JLCPCB
Firmware
Arduino Uno R4 · hardware-timer ISR · phase-locked DAC + dual ADC at 420 Hz
Highlight
Rejected an on-board I²C ADC — sequential reads would corrupt the phase measurement. Analog simultaneous sampling keeps both channels coherent.
Build