项目采用MAX30102血氧及心率监视模块、Arduino UNO板、OLED显示器和蜂鸣器，搭建了一个简单的心率（BPM）测量仪。
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%。
项目物料
本项目所需材料包括：
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传感器，具有不同版本，但是只要型号正确即可。
Arduino UNO（×1）
OLED 128x32（×1）：低功耗显示器。
Buzzer （×1）：蜂鸣器
面包板（×1）：方便组件安装和连接的线路板。
连接线
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。
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。
本项目采用４次BPM读数的平均值，因此比较准确。
让OLED显示bmp图像
OLED显示的是小的“心形”栅格图（bmp），一旦传感器检测到一次心跳，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。
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。
下载LCD助手并打开。
可看到如下"数字"
这就是所谓的代码：
display.drawBitmap(5, 5, logo2_bmp, 24, 21, WHITE);
其含义为：
display.drawBitmap(Starting x pos, Starting y pos, Bitmap name, Width, Height, Color);
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”。
以下是更新后的代码：
MAX_BPM_OLED_Buzzer.inoArduinoModified from the SparkFun MAX3010x library/* This code works with MAX30102 + 128x32 OLED i2c + Buzzer and Arduino UNO* It's displays the Average BPM on the screen, with an animation and a buzzer sound* everytime a heart pulse is detected* It's a modified version of the HeartRate library example* Refer to www.surtrtech.com for more details or SurtrTech YouTube channel*/MAX30105 particleSensor;const byte RATE_SIZE = 4; //Increase this for more averaging. 4 is good.byte rates[RATE_SIZE]; //Array of heart ratesbyte rateSpot = 0;long lastBeat = 0; //Time at which the last beat occurredfloat beatsPerMinute;int beatAvg;Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); //Declaring the display name (display)static const unsigned char PROGMEM logo2_bmp[] ={ 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 called0x04, 0x01, 0x10, 0x04, 0x01, 0x10, 0x40, 0x01, 0x10, 0x40, 0x01, 0x10, 0xC0, 0x03, 0x08, 0x88,0x02, 0x08, 0xB8, 0x04, 0xFF, 0x37, 0x08, 0x01, 0x30, 0x18, 0x01, 0x90, 0x30, 0x00, 0xC0, 0x60,0x00, 0x60, 0xC0, 0x00, 0x31, 0x80, 0x00, 0x1B, 0x00, 0x00, 0x0E, 0x00, 0x00, 0x04, 0x00, };static const unsigned char PROGMEM logo3_bmp[] ={ 0x01, 0xF0, 0x0F, 0x80, 0x06, 0x1C, 0x38, 0x60, 0x18, 0x06, 0x60, 0x18, 0x10, 0x01, 0x80, 0x08,0x20, 0x01, 0x80, 0x04, 0x40, 0x00, 0x00, 0x02, 0x40, 0x00, 0x00, 0x02, 0xC0, 0x00, 0x08, 0x03,0x80, 0x00, 0x08, 0x01, 0x80, 0x00, 0x18, 0x01, 0x80, 0x00, 0x1C, 0x01, 0x80, 0x00, 0x14, 0x00,0x80, 0x00, 0x14, 0x00, 0x80, 0x00, 0x14, 0x00, 0x40, 0x10, 0x12, 0x00, 0x40, 0x10, 0x12, 0x00,0x7E, 0x1F, 0x23, 0xFE, 0x03, 0x31, 0xA0, 0x04, 0x01, 0xA0, 0xA0, 0x0C, 0x00, 0xA0, 0xA0, 0x08,0x00, 0x60, 0xE0, 0x10, 0x00, 0x20, 0x60, 0x20, 0x06, 0x00, 0x40, 0x60, 0x03, 0x00, 0x40, 0xC0,0x01, 0x80, 0x01, 0x80, 0x00, 0xC0, 0x03, 0x00, 0x00, 0x60, 0x06, 0x00, 0x00, 0x30, 0x0C, 0x00,0x00, 0x08, 0x10, 0x00, 0x00, 0x06, 0x60, 0x00, 0x00, 0x03, 0xC0, 0x00, 0x00, 0x01, 0x80, 0x00 };void setup() {display.begin(SSD1306_SWITCHCAPVCC, 0x3C); //Start the OLED displaydisplay.display();delay(3000);// Initialize sensorparticleSensor.begin(Wire, I2C_SPEED_FAST); //Use default I2C port, 400kHz speedparticleSensor.setup(); //Configure sensor with default settingsparticleSensor.setPulseAmplitudeRed(0x0A); //Turn Red LED to low to indicate sensor is running}void loop() {long irValue = particleSensor.getIR(); //Reading the IR value it will permit us to know if there's a finger on the sensor or not//Also detecting a heartbeatif(irValue > 7000){ //If a finger is detecteddisplay.clearDisplay(); //Clear the displaydisplay.drawBitmap(5, 5, logo2_bmp, 24, 21, WHITE); //Draw the first bmp picture (little heart)display.setTextSize(2); //Near it display the average BPM you can display the BPM if you wantdisplay.setTextColor(WHITE);display.setCursor(50,0);display.println("BPM");display.setCursor(50,18);display.println(beatAvg);display.display();if (checkForBeat(irValue) == true) //If a heart beat is detected{display.clearDisplay(); //Clear the displaydisplay.drawBitmap(0, 0, logo3_bmp, 32, 32, WHITE); //Draw the second picture (bigger heart)display.setTextSize(2); //And still displays the average BPMdisplay.setTextColor(WHITE);display.setCursor(50,0);display.println("BPM");display.setCursor(50,18);display.println(beatAvg);display.display();tone(3,1000); //And tone the buzzer for a 100ms you can reduce it it will be betterdelay(100);noTone(3); //Deactivate the buzzer to have the effect of a "bip"//We sensed a beat!long delta = millis() - lastBeat; //Measure duration between two beatslastBeat = millis();beatsPerMinute = 60 / (delta / 1000.0); //Calculating the BPMif (beatsPerMinute < 255 && beatsPerMinute > 20) //To calculate the average we strore some values (4) then do some math to calculate the average{rates[rateSpot++] = (byte)beatsPerMinute; //Store this reading in the arrayrateSpot %= RATE_SIZE; //Wrap variable//Take average of readingsbeatAvg = 0;for (byte x = 0 ; x < RATE_SIZE ; x++)beatAvg += rates[x];beatAvg /= RATE_SIZE;}}}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 measurebeatAvg=0;display.clearDisplay();display.setTextSize(1);display.setTextColor(WHITE);display.setCursor(30,5);display.println("Please Place ");display.setCursor(30,15);display.println("your finger ");display.display();noTone(3);}}
作者：硬之城Allchips， 来源：面包板社区
链接：https://mbb.eet-china.com/blog/3975615-426276.html
版权声明：本文为博主原创，未经本人允许，禁止转载！
END
▼
无线模块的板载天线调整
5000字的HDMI知识指南！
【晒板子】焊了近40块板子，做了个高压电源
我在STM32单片机上跑神经网络算法
不用GD32？我把STM32换成了国产MM32
【晒板子】OneWatch手表（芯片选型+原理图）
