| 摘要 |
FIELD: medicine.SUBSTANCE: invention relates to medicine and can be used to diagnose patient's heart rate. Microcontroller transducer for photoplethysmographic pulse sensor comprises a microcontroller, a LED, a photodetector, RC-filter, first and second resistors. First lead of first resistor is connected to anode of LED. First lead of second resistor connected to first lead of photodetector. Cathode of LED and a second lead of photodetector are connected to negative terminal of power supply of microcontroller. Second lead of second resistor is connected to positive terminal of power supply of microcontroller. Output of RC-filter is connected to first input of analogue comparator of microcontroller. Microcontroller measuring transducer also includes third and fourth resistors. Second lead of first resistor is connected to output of pulse-width modulator of microcontroller. First lead of photodetector is connected to input of RC-filter. First leads of third and fourth resistors are connected to second input of analogue comparator of microcontroller. Second lead of third resistor is connected to positive terminal of power supply of microcontroller. Second lead of fourth resistor is connected to negative terminal of power supply of microcontroller.EFFECT: higher measurement accuracy.1 cl, 1 dwg |
