Implementation of Wristband PPG Heart Rate Variation Monitor

• Main Authors: HUANG, JYUN-YING, 黃俊穎
• Other Authors: KUO, WEN-KAI
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/aehsyg

碩士 === 國立虎尾科技大學 === 光電工程系光電與材料科技碩士班 === 106 === The PPG (Photoplethysmogram) was used to measure the heart rate variability (HRV) measurement signal. The low-power microprocessor Holtek HT66F70A captured the heartbeat interval per unit time of the PPG signal and used low power. Spending Bluetooth 4.0 sends the measurement data to the APP of the mobile phone for calculations to observe the rate of heart rate variation and changes in parasympathetic nerves. The lightweight and power consumption make it easy to carry and monitor its current physiological condition at any time. The micro-processing chip used is the Holtek HT66F70A whose memory is 2048 Byte and contains 12 Bit A/D for the monitoring system to intercept the heart rate signal. The relevant measurement signal is set as the sampling period of 146.4 ms which is equivalent to the sampling frequency of 6.82 Hz, and the number of samples is once. Measurement period is 5 minutes (2048 times). The microprocessor performs heartbeat R-wave interval measurement and then uses the Berger's algorithm to find the heart rate equidistant waveforms. After that, the result of the calculation is the UART protocol, from the low-power Bluetooth 4.0. The calculation data is transmitted to the mobile phone for heart rate analysis and spectrum conversion. After calculation, the display items include: TP (total power), HF (high frequency power), LF (low frequency power), LF/HF (low-frequency power ratio) .。