A bare-metal heart-rate monitor and breathing assistant built for the STM32 Nucleo-F411RE development board. When user's heart rate stays elevated, it automatically starts a timed inhale/exhale breathing exercise to help bring itback down.
- Real-time BPM estimation
- Animated OLED UI
- Auto-detect finger presence
- Guided breathing exercise — Triggers automatically when BPM ≥ 140 for 5 s; shows inhale/exhale instructions with a live progress bar
| Board | NUCLEO-F411RE |
|---|---|
| Language | C |
| Sensor | MAX30102 (heartbeat-only mode) |
| Display | SH1106 128×64 OLED, I2C |
| Project generator | STM32CubeMX |
