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MAXREFDES117#:心率和脉搏血氧监测器

MAXREFDES117

参考设计免责声明 参照  重要声明和免责声明  涵盖参考设计和其他Maxim资源

描述

MAXREFDES117#参考设计是低功耗、光学心率模块,集成红光和红外(IR) LED以及电源。微小的电路板非常适合可穿戴项目,可穿戴在指尖或耳垂,高精度检测心率。这款通用模块同时支持Arduino和mbed平台,便于快速测试、开发和系统调试。示例固件中提供基础、开源的心率和SpO2算法。

电路板具有8个缝纫垫,用于安装以及快速连接到开发平台。

与所有的Maxim参考设计一样,设计资源选项卡提供BOM、原理图、布局文件以及Gerber文件。此外,有电路板可供购买。

竞争优势

  • 高度集成、小尺寸传感器
  • 非胸带心率/SpO2检测
  • 超低功耗

特征

  • 光学心率监测和脉搏血氧方案
  • 微型12.7mm x 12.7mm (0.5in x 0.5in)电路板尺寸
  • 低功耗
  • 器件驱动器
  • 免费算法
  • 示例C语言源代码,支持Arduino和mbed平台
  • 测试数据

  • maxrefdes117fig01

    maxrefdes117fig01

  • maxrefdes117fig00

    maxrefdes117fig00

Icon

设计,建造,测试

图中的电路板已完全组装并经过测试。

 

细节部分

细节部分

Detailed Description of Firmware

The MAXREFDES117# can be used with virtually any microcontroller that has I2C interface. The Arduino and mbed example firmware have been tested on the following development platforms:

mbed:

  • Maxim Integrated MAX32600MBED#
  • Freescale FRDM-K64F
  • Freescale FRDM-KL25Z

Arduino:

  • Adafruit Flora
  • Lilypad USB
  • Arduino UNO

Users may read sampled data, calculated heart rate and SpO2 through a terminal program, allowing analysis on excel or any third-party software. The simple process flow is shown in Figure 2.

Figure 2. The MAXREFDES117# firmware flowchart.

The complete source code, including the heart rateheart-rate/SpO2 algorithm, is provided to accelerate development. Code documentation can be found in the corresponding firmware platform files.

Heart rateHeart-rate accuracy varies depending on the chosen platform. The tested mbed platforms give more accurate heart-rate/SpO2 calculations than the tested Arduino platforms because the mbed platform controllers have more SRAM than the Arduino platform controllers. For the example firmware, mbed platforms store 5 seconds of samples collected at 100sps, while the Arduino platforms store 4 seconds of samples collected at 25sps.

SpO2 calculation is based on the equation shown below. However, determining the constants (C1, C2, and C3) requires a comprehensive clinical study of pulse pulse-oximetry data from a statistically significant population set using this hardware. Such a clinical study is beyond scope of this design. Therefore, the calculated SpO2 value may havecan have an error.

SpO2 = C1 × AverageRatio2 + C2 × AverageRation + C3

Where AverageRatio is the average ratio of IR and red LED readings. C1, C2, and C3 are constants.

Quick Start

Required equipment:

  • Windows PC with a USB port
  • MAXREFDES117# board
  • 5 cables that can be used to connect the MAXREFDES117# with the controller board
  • One of the supported mbed or Arduino controller boards listed above
  • One USB cable that is compatible with the selected controller board

Download, read, and carefully follow each step in the appropriate MAXREFDES117# quick Start Guide:

MAXREFDES117# mbed Quick Start Guide
MAXREFDES117# Arduino Quick Start Guide

Lab Measurements

Equipment used:

  • MAX32600MBED#
  • Adafruit Flora
  • Adafruit BlueFruit
  • Polar H7 Bluetooth Smart Heart RateHeart-Rate Sensor
  • Android tablet

Figure 3 and Figure 4 show how the MAXREFDES117 calculated heart rate compared to the Polar H7 chest strap. The data in Figure 3 were taken while the person was sitting still for 20 minutes. And the data in Figure 4 were taken while the person was walking at a normal speed for 20 minutes.

Figure 3. For sedentary test, over 99% of the mbed + MAXREFDES117# heart heart-rate data are less than 5 beats/min delta from the Polar H7 chest strap.

Figure 4. For moving test, over 92% of the Arduino + MAXREFDES117# heart- rate data are less than 10 beats/min delta from the Polar H7 chest strap.

参数化

输入类型 Vin(Min) Vin(Max) Iout(Max) 单路/多路输出 Vout(V) Pout(W) 隔离/非隔离 拓扑
DC - 5.5 - - - - - -

参数化

输入类型 DC
Vin(Min) -
Vin(Max) 5.5
Iout(Max) -
单路/多路输出 -
Vout(V) -
Pout(W) -
隔离/非隔离 -
拓扑 -

Maxim设备 (3)

器件号 名称 产品线 购买 设计套件和评估模块
MAX30102 用于可穿戴健康设备的高灵敏度脉搏血氧仪和心率传感器 传感器接口IC 立即购买 设计套件
MAX14595 高速、漏极开路逻辑电平转换器 电平转换器 立即购买 设计套件
MAX1921 低电压、400mA、降压型DC-DC转换器,SOT23封装 开关稳压器 立即购买 设计套件

Maxim设备 (3)

器件号 产品线
传感器接口IC
用于可穿戴健康设备的高灵敏度脉搏血氧仪和心率传感器
电平转换器
高速、漏极开路逻辑电平转换器
开关稳压器
低电压、400mA、降压型DC-DC转换器,SOT23封装

设计资料 (8)

标题 类型 尺寸 日期
MAXREFDES117#: Heart-Rate and Pulse-Oximetry Monitor PDF 57KB 2017-11-03
rd117_mbed_v01_00 ZIP 550KB 2017-11-03
maxrefdes117_fab_package_ra ZIP 6MB 2017-11-03
rd117v01_00 ZIP 18MB 2017-11-03
MAXREFDES117BMA.xls ; MAXREFDES117#: Heart-Rate and Pulse-Oximetry Monitor PDF 12KB 2017-11-03
rd117_arduino_v01_00 ZIP 514KB 2017-11-03
MAXREFDES117#: Heart-Rate and Pulse-Oximetry Monitor PDF 9MB 2017-11-03
maxrefdes117_cad_ra ZIP 10MB 2017-11-03
日期 类型
2017-11-03

MAXREFDES117#: Heart-Rate and Pulse-Oximetry Monitor

(PDF, 57KB)

2017-11-03

rd117_mbed_v01_00

(ZIP, 550KB)

2017-11-03

maxrefdes117_fab_package_ra

(ZIP, 6MB)

2017-11-03

rd117v01_00

(ZIP, 18MB)

2017-11-03

MAXREFDES117BMA.xls ; MAXREFDES117#: Heart-Rate and Pulse-Oximetry Monitor

(PDF, 12KB)

2017-11-03

rd117_arduino_v01_00

(ZIP, 514KB)

2017-11-03

MAXREFDES117#: Heart-Rate and Pulse-Oximetry Monitor

(PDF, 9MB)

2017-11-03

maxrefdes117_cad_ra

(ZIP, 10MB)

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