脈搏感測器

脈搏感測器模組(Pulse Sensor)

感測器簡介

PulseSensor 脈搏心率感測器生物模擬感測器，感測器這是用於非侵入性心臟速率監控的醫療裝置。原理是分析脈搏感測器上頭所發出的光經過反射後所接收到的相對變化值。更多原裡請參考 ARDUINO CODE V1.2 WALKTHROUGH。

電路圖

Pycode程式列表

Blockly

Python

"""

ePy-Lite_PulseSensorAmped.py

EPY Pulse Sensor Amped

-----------------

ADC(0) VOUT

3V3 VCC

GND GND

"""

from machine import Timer

from machine import Pin,ADC

from machine import Switch

timer = None

done = None

alpha = None

change = None

oldValue = None

rawValue = None

value = None

tim_3 = None

adc0 = None

KeyA = None

"""描述此函式..."""

def tick3(timer):

global done, alpha, change, oldValue, rawValue, value

done = True

return done

tim_3 = Timer(3,mode=Timer.PERIODIC)

adc0 = ADC()

KeyA = KEY()

tim_3 = Timer(3,freq = 50)

tim_3.callback(tick3)

alpha = 0.75

change = 0

oldValue = 0

done = None

while True:

if done == 1:

rawValue = adc0.read()

value = alpha * oldValue + (1 - alpha) * rawValue

print(''.join([str(x) for x in [rawValue, ',', value]]))

oldValue = value

done = False

if (KeyA.value()) == True:

break

執行結果