大家好，我是讯享网，很高兴认识大家。



 <p> 项目采用MAX30102血氧及心率监视模块、<u>Arduino</u> UNO板、<u>OLED</u>显示器和蜂鸣器，搭建了一个简单的心率（BPM）测量仪。</p> 

讯享网

讯享网 </p> 

讯享网

<br /> 这里，BPM为每分钟的心跳数，正常人的数字为65-75之间，体育运动员的数字要低些；血氧饱和度(SaO2)对于正常然来说大概为95%。</p> 

讯享网项目物料</p> 

本项目所需材料包括：<br /> Max30102（×1）：这是项目的功能器件，是一款用于可穿戴设备的高灵敏脉冲式血样及心率<u>传感器</u>，具有不同版本，但是只要型号正确即可。 <br /> Arduino UNO（×1）<br /> OLED 128x32（×1）：低功耗显示器。 <br /> Buzzer （×1）：蜂鸣器<br /> 面包板（×1）：方便组件安装和连接的线路板。<br /> 连接线</p> 

讯享网 </p> 

<br /> 本项目所用代码来自Sparkfun_MAX3010x示例库，OLED和Buzzer代码根据 "HeartRate" 示例改进而来，这需要用户将手指放在传感器上。</p> 

讯享网注意，如果将手指放在传感器上，就要保持安静，直到蜂鸣器的“哔哔”声与你的心率节拍同步，或者与OLED动画同步，这时可读出正确的BPM心率读数。</p> 

 </p> 

讯享网<br /> 本项目采用４次BPM读数的平均值，因此比较准确。</p> 

<br /> 让OLED显示bmp图像</p> 

讯享网<br /> OLED显示的是小的“心形”栅格图（bmp），一旦传感器<u>检测</u>到一次心跳，就立即切换为大点的“心形”栅格图并保持一会儿，这样屏幕就像心跳一样，一闪一闪的，并伴有蜂鸣器的“哔哔”声。</p> 

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讯享网<br /> 选择希望看到的图走向的格式，如 .png .bmp .dib等。切记，本项目屏幕尺寸为128x32px，图像尺寸要小一些，为32x32px和24x21px。</p> 

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讯享网<br /> <u>下载</u>LCD助手并打开。</p> 

 </p> 

讯享网<br /> 可看到如下"数字"</p> 

 </p> 

讯享网<br /> 这就是所谓的代码：</p> 

display.drawBitmap(5, 5, logo2_bmp, 24, 21, WHI<u>TE</u>);</p> 

讯享网其含义为：</p> 

display.drawBitmap(Star<u>ti</u>ng x pos, Starting y pos, Bitmap name, Width, Height, Color);</p> 

讯享网这段代码描述了两件事——“当检测到手指时做什么”，以及“捡到心跳时做什么”。</p> 

以下是更新后的代码：</p> 

讯享网MAX_BPM_OLED_Buzzer.inoArduino<br /> Modified from the SparkFun MAX3010x library</p> 

/* This code w<u>or</u>ks with MAX30102 + 128x32 OLED <u>i2c</u> + Buzzer and Arduino UNO<br /> * It's displays the Average BPM on the screen, with an animation and a buzzer sound<br /> * everytime a heart pulse is detected<br /> * It's a modified version of the HeartRate library example<br /> * Refer to www.surtrtech.com for more det<u>ai</u>ls or SurtrTech YouTube channel<br /> */</p> 

讯享网#include        //OLED libraries<br /> #include <br /> #include <br /> #include "MAX30105.h"           //MAX3010x library<br /> #include "heartRate.h"          //Heart rate calculating algorithm</p> 

MAX30105 part<u>icl</u>eSensor;</p> 

讯享网const byte RATE_SIZE = 4; //Increase this for more averaging. 4 is good.<br /> byte rates[RATE_SIZE]; //Array of heart rates<br /> byte rateSpot = 0;<br /> long lastBeat = 0; //Time at which the last beat occurred<br /> float beatsPerMinute;<br /> int beatAvg;</p> 

#define SCREEN_WIDTH 128 // OLED display width, in <u>pi</u>xels<br /> #define SCREEN_HEIGHT 32 // OLED display height, in pixels<br /> #define OLED_RESET    -1 // Reset pin # (or -1 if sharing Arduino reset pin)</p> 

讯享网<u>Ad</u>afruit_S<u>SD</u>1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); //Declaring the display name (display)</p> 

stat<u>ic</u> const unsigned char PROGMEM logo2_bmp[] =<br /> { 0x03, 0xC0, 0xF0, 0x06, 0x71, 0x8C, 0x0C, 0x1B, 0x06, 0x18, 0x0E, 0x02, 0x10, 0x0C, 0x03, 0x10,              //Logo2 and Logo3 are two bmp pictures that display on the OLED if cal<u>led</u><br /> 0x04, 0x01, 0x10, 0x04, 0x01, 0x10, 0x40, 0x01, 0x10, 0x40, 0x01, 0x10, 0xC0, 0x03, 0x08, 0x88,<br /> 0x02, 0x08, 0xB8, 0x04, 0xFF, 0x37, 0x08, 0x01, 0x30, 0x18, 0x01, 0x90, 0x30, 0x00, 0xC0, 0x60,<br /> 0x00, 0x60, 0xC0, 0x00, 0x31, 0x80, 0x00, 0x1B, 0x00, 0x00, 0x0E, 0x00, 0x00, 0x04, 0x00,  };</p> 

讯享网static const unsigned char PROGMEM logo3_bmp[] =<br /> { 0x01, 0xF0, 0x0F, 0x80, 0x06, 0x1C, 0x38, 0x60, 0x18, 0x06, 0x60, 0x18, 0x10, 0x01, 0x80, 0x08,<br /> 0x20, 0x01, 0x80, 0x04, 0x40, 0x00, 0x00, 0x02, 0x40, 0x00, 0x00, 0x02, 0xC0, 0x00, 0x08, 0x03,<br /> 0x80, 0x00, 0x08, 0x01, 0x80, 0x00, 0x18, 0x01, 0x80, 0x00, 0x1C, 0x01, 0x80, 0x00, 0x14, 0x00,<br /> 0x80, 0x00, 0x14, 0x00, 0x80, 0x00, 0x14, 0x00, 0x40, 0x10, 0x12, 0x00, 0x40, 0x10, 0x12, 0x00,<br /> 0x7E, 0x1F, 0x23, 0xFE, 0x03, 0x31, 0xA0, 0x04, 0x01, 0xA0, 0xA0, 0x0C, 0x00, 0xA0, 0xA0, 0x08,<br /> 0x00, 0x60, 0xE0, 0x10, 0x00, 0x20, 0x60, 0x20, 0x06, 0x00, 0x40, 0x60, 0x03, 0x00, 0x40, 0xC0,<br /> 0x01, 0x80, 0x01, 0x80, 0x00, 0xC0, 0x03, 0x00, 0x00, 0x60, 0x06, 0x00, 0x00, 0x30, 0x0C, 0x00,<br /> 0x00, 0x08, 0x10, 0x00, 0x00, 0x06, 0x60, 0x00, 0x00, 0x03, 0xC0, 0x00, 0x00, 0x01, 0x80, 0x00  };</p> 

<br /> void setup() {  <br />  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); //Start the OLED display<br />  display.display();<br />  delay(3000);<br />  // Initialize sensor<br />  particleSensor.begin(Wire, I2C_SPEED_FAST); //Use default I2C port, 400kHz speed<br />  particleSensor.setup(); //Configure sensor with default settings<br />  particleSensor.setPulseAmplitudeRed(0x0A); //Turn Red LED to low to indicate sensor is running</p> 

讯享网}</p> 

void loop() {<br /> long irValue = particleSensor.getIR();    //Re<u>adi</u>ng the IR value it will permit us to know if there's a finger on the sensor or not<br />                                           //Also detecting a heartbeat<br /> if(irValue > 7000){                                           //If a finger is detected<br />    display.clearDisplay();                                   //Clear the display<br />    display.drawBitmap(5, 5, logo2_bmp, 24, 21, WHITE);       //Draw the fi<u>rs</u>t bmp picture (little heart)<br />    display.setTextSize(2);                                   //Near it display the average BPM you <u>can</u> display the BPM if you want<br />    display.setTextColor(WHITE); <br />    display.setCursor(50,0);                <br />    display.println("BPM");             <br />    display.setCursor(50,18);                <br />    display.println(beatAvg); <br />    display.display();<br />    <br />  if (checkForBeat(irValue) == true)                        //If a heart beat is detected<br />  {<br />    display.clearDisplay();                                //Clear the display<br />    display.drawBitmap(0, 0, logo3_bmp, 32, 32, WHITE);    //Draw the second picture (bigger heart)<br />    display.setTextSize(2);                                //And still displays the average BPM<br />    display.setTextColor(WHITE);             <br />    display.setCursor(50,0);                <br />    display.println("BPM");             <br />    display.setCursor(50,18);                <br />    display.println(beatAvg); <br />    display.display();<br />    tone(3,1000);                                        //And tone the buzzer for a 100ms you can reduce it it will be better<br />    delay(100);<br />    noTone(3);                                          //De<u>ac</u>tivate the buzzer to have the effect of a "bip"<br />    //We sensed a beat!<br />    long delta = millis() - lastBeat;                   //Measure duration between two beats<br />    lastBeat = millis();</p> 

讯享网   beatsPerMinute = 60 / (delta / 1000.0);           //Calculating the BPM</p> 

   if (beatsPerMinute < 255 && beatsPerMinute > 20)               //To calculate the average we strore some values (4) then do some math to calculate the average<br />    {<br />      rates[rateSpot++] = (byte)beatsPerMinute; //Store this reading in the array<br />      rateSpot %= RATE_SIZE; //Wrap variable</p> 

讯享网     //Take average of readings<br />      beatAvg = 0;<br />      for (byte x = 0 ; x < RATE_SIZE ; x++)<br />        beatAvg += rates[x];<br />      beatAvg /= RATE_SIZE;<br />    }<br />  }</p> 

}<br />  if (irValue < 7000){       //If no finger is detected it inform the user and put the average BPM to 0 or it will be stored for the next measure<br />     beatAvg=0;<br />     display.clearDisplay();<br />     display.setTextSize(1);                    <br />     display.setTextColor(WHITE);             <br />     display.setCursor(30,5);                <br />     display.println("Please Place "); <br />     display.setCursor(30,15);<br />     display.println("your finger ");  <br />     display.display();<br />     noTone(3);<br />     }</p> 

讯享网}<br /><br /> 审核编辑：汤梓红</p>