- need to refatoring (delete commented code, needless code/function)
- intterrupt 32.258 Hz, more approch to 32.0 Hz (need to control micro second)
- Or optimize iir filter const in pwCalc_Init()
- more control precisely intensity of LED (currently optimized BH1970GLC, BH1792GLC can control precisely)
- need to control IR (turn on when in darkness, regardless with/without finger)
https://www.rohm.co.jp/sensor-shield-support/pulse-wave-sensor2
- nRF52DK board
- BH1792GLC evaluation board
- resistor 1k ohm x3
- cable for conncection between pin x6