如何使用max30105传感器获取ppg值

Question

我想要将 ppg 值设置为 max30105。

但我在代码中找不到 ppg 值。

只是我发现心率。

如何获得ppg值？

#!/usr/bin/env python

# NOTE! This code should not be used for medical diagnosis. It's
# for fun/novelty use only, so bear that in mind while using it.

import time
from max30105 import MAX30105, HeartRate

max30105 = MAX30105()
max30105.setup(leds_enable=2)

max30105.set_led_pulse_amplitude(1, 0.2)
max30105.set_led_pulse_amplitude(2, 12.5)
max30105.set_led_pulse_amplitude(3, 0)

max30105.set_slot_mode(1, 'red')
max30105.set_slot_mode(2, 'ir')
max30105.set_slot_mode(3, 'off')
max30105.set_slot_mode(4, 'off')


def display_heartrate(beat, bpm, avg_bpm):
    print("{} BPM: {:.2f}  AVG: {:.2f}".format("<3" if beat else "  ",
          bpm, avg_bpm))


hr = HeartRate(max30105)

print("""
NOTE! This code should not be used for medical diagnosis. It's
for fun/novelty use only, so bear that in mind while using it.
This example shows a readout of your heart rate in BPM (beats per
minute) and heartbeats detected using a heart emoticon <3.
It's best to hold the sensor against your fingertip (the fleshy side)
using a piece of wire or a rubber band looped through the mounting
holes on the breakout, as the sensor is very sensitive to small
movements and it's hard to hold your finger against the sensor with
even pressure.
If you're using your MAX30105 Breakout with Breakout Garden, then
we'd recommend using one of our Breakout Garden Extender Kits with
some female-to-female jumper jerky.
https://shop.pimoroni.com/products/breakout-garden-extender-kit
""")

delay = 10

print("Starting readings in {} seconds...\n".format(delay))
time.sleep(delay)

try:
    hr.on_beat(display_heartrate, average_over=4)
except KeyboardInterrupt:
    pass

在这段代码中，可以得到心率。

但是，我想要获得 PPG 价值。

我使用这个库。

https://github.com/pimoroni/max30105-python

我一直在分析库。

谢谢。