Heart Unit

MAX30100 is a complete pulse oximetry and heart-rate sensor system solution designed for the demanding requirements of wearable devices.

Support the following products:

Micropython Example:

# SPDX-FileCopyrightText: 2024 M5Stack Technology CO LTD
#
# SPDX-License-Identifier: MIT

import os, sys, io
import M5
from M5 import *
from hardware import *
from unit import HeartUnit


label0 = None
labelHeart = None
i2c0 = None
heart_0 = None


def setup():
    global label0, labelHeart, i2c0, heart_0

    M5.begin()
    Widgets.fillScreen(0x222222)
    label0 = Widgets.Label("Heart Rate", 57, 18, 1.0, 0xFFFFFF, 0x222222, Widgets.FONTS.DejaVu40)
    labelHeart = Widgets.Label("label1", 82, 111, 1.0, 0xFFFFFF, 0x222222, Widgets.FONTS.DejaVu56)

    i2c0 = I2C(0, scl=Pin(22), sda=Pin(21), freq=400000)
    heart_0 = HeartUnit(i2c0, 0x57)
    heart_0.start()


def loop():
    global label0, labelHeart, i2c0, heart_0
    M5.update()
    labelHeart.setText(str(heart_0.get_heart_rate()))


if __name__ == "__main__":
    try:
        setup()
        while True:
            loop()
    except (Exception, KeyboardInterrupt) as e:
        try:
            heart_0.deinit()
            from utility import print_error_msg

            print_error_msg(e)
        except ImportError:
            print("please update to latest firmware")

UIFLOW2 Example:

core_heart_unit_example.m5f2

class HeartUnit

Constructors

class HeartUnit(i2c, address)

Initialize the HeartUnit.

• i2c: I2C port to use.

• address: I2C address of the HeartUnit.

UIFLOW2:

Methods

HeartUnit.stop()

Stop the HeartUnit.

UIFLOW2:

HeartUnit.start()

Start the HeartUnit.

UIFLOW2:

HeartUnit.deinit()

Deinitialize the HeartUnit.

UIFLOW2:

HeartUnit.get_heart_rate()

Get the heart rate.

UIFLOW2:

HeartUnit.get_spo2()

Get the SpO2.

UIFLOW2:

HeartUnit.get_ir()

Get the IR value.

UIFLOW2:

HeartUnit.get_red()

Get the red value.

UIFLOW2:

HeartUnit.set_mode(mode)

Set the mode of the HeartUnit.

参数:

mode (int) – The detect mode of the HeartUnit. Options: - HeartUnit.MODE_HR_ONLY: Only heart rate - HeartUnit.MODE_SPO2_HR: Heart rate and SpO2

UIFLOW2:

HeartUnit.set_led_current(led_current)

Set the LED current of the HeartUnit.

参数:

led_current (int) – The LED current of the HeartUnit. Options: - HeartUnit.LED_CURRENT_0MA: 0mA - HeartUnit.LED_CURRENT_4_4MA: 4.4mA - HeartUnit.LED_CURRENT_7_6MA: 7.6mA - HeartUnit.LED_CURRENT_11MA: 11mA - HeartUnit.LED_CURRENT_14_2MA: 14.2mA - HeartUnit.LED_CURRENT_17_4MA: 17.4mA - HeartUnit.LED_CURRENT_20_8MA: 20.8mA - HeartUnit.LED_CURRENT_24MA: 24mA - HeartUnit.LED_CURRENT_27_1MA: 27.1mA - HeartUnit.LED_CURRENT_30_6MA: 30.6mA - HeartUnit.LED_CURRENT_33_8MA: 33.8mA - HeartUnit.LED_CURRENT_37MA: 37mA - HeartUnit.LED_CURRENT_40_2MA: 40.2mA - HeartUnit.LED_CURRENT_43_6MA: 43.6mA - HeartUnit.LED_CURRENT_46_8MA: 46.8mA - HeartUnit.LED_CURRENT_50MA: 50mA

UIFLOW2:

HeartUnit.set_pulse_width(pulse_width)

Set the pulse width of the HeartUnit.

参数:

pulse_width (int) – The pulse width of the HeartUnit. Options: - HeartUnit.PULSE_WIDTH_200US_ADC_13: 200us - HeartUnit.PULSE_WIDTH_400US_ADC_14: 400us - HeartUnit.PULSE_WIDTH_800US_ADC_15: 800us - HeartUnit.PULSE_WIDTH_1600US_ADC_16: 1600us

UIFLOW2:

HeartUnit.set_sampling_rate(sampling_rate)

Set the sampling rate of the HeartUnit.

参数:

sampling_rate (int) – The sampling rate of the HeartUnit. Options: - HeartUnit.SAMPLING_RATE_50HZ: 50Hz - HeartUnit.SAMPLING_RATE_100HZ: 100Hz - HeartUnit.SAMPLING_RATE_167HZ: 167Hz - HeartUnit.SAMPLING_RATE_200HZ: 200Hz - HeartUnit.SAMPLING_RATE_400HZ: 400Hz - HeartUnit.SAMPLING_RATE_600HZ: 600Hz - HeartUnit.SAMPLING_RATE_800HZ: 800Hz - HeartUnit.SAMPLING_RATE_1000HZ: 1000Hz

UIFLOW2:

Constants

HeartUnit.MODE_HR_ONLY

Detect heart rate only.

HeartUnit.MODE_SPO2_HR

Detect heart rate and SpO2.