【物资准备】

esp32-wroom

max30102

点灯科技账号or阿里云物联网平台账号

（本来是想用屏幕去显示的，但是我发现我的esp32只有一个iic引出来，而max30102模块正好是iic通讯，我又懒得弄spi的屏幕，所以用手机app或者网页去起到显示数据的一个作用了）

1、阿里云物联网平台

先上代码

#include <WiFi.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>// 这里添加要连的wifi名称和密码
const char* ssid     = "";
const char* password = "";/* 设备证书信息，根据情况修改*/
#define PRODUCT_KEY       ""
#define DEVICE_NAME       ""
#define DEVICE_SECRET     ""
#define REGION_ID         "cn-shanghai"#define CLIENT_ID         ""
#define MQTT_PASSWD       ""#define ALINK_BODY_FORMAT         "{\"params\":%s}"
#define ALINK_TOPIC_PROP_POST     "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post"/* 线上环境域名和端口号，不需要改 */
#define MQTT_SERVER       PRODUCT_KEY ".iot-as-mqtt." REGION_ID ".aliyuncs.com"
#define MQTT_PORT         1883
#define MQTT_USRNAME      DEVICE_NAME "&" PRODUCT_KEYWiFiClient espClient;
PubSubClient  client(espClient);void WiFiInit()
{WiFi.begin(ssid, password);while(WiFi.status() != WL_CONNECTED){delay(500);Serial.print(".");}Serial.println("WIFI CONNECTED!");
}// 连接MQTT，每隔5s自动重连
void mqttCheckConnect()
{while(!client.connected()){Serial.println("Connecting to MQTT Server ...");if(client.connect(CLIENT_ID, MQTT_USRNAME, MQTT_PASSWD)){Serial.println("MQTT Connected!");}else{Serial.print("MQTT Connect err:");Serial.println(client.state());delay(5000);}}
}// publish（ESP32发送，阿里云接收）
void mqttIntervalPost()
{char param[32];     // 存放参数数据char jsonBuf[128];  // 存放json格式数据sprintf(param, "{\"XY\":%d}", 32); //这是测试的发送数据sprintf(jsonBuf, ALINK_BODY_FORMAT, param);Serial.println(jsonBuf);if(client.publish(ALINK_TOPIC_PROP_POST, jsonBuf)){Serial.println("Publish success!");}else{Serial.println("Publish error!");}
}void setup()
{Serial.begin(115200);WiFiInit();client.setServer(MQTT_SERVER, MQTT_PORT);client.setCallback(callback);}void loop()
{if(!client.connected()){mqttCheckConnect();//mqttIntervalPost();}mqttIntervalPost();//定期发送血氧数据client.loop();delay(500);
}

阿里云我用的是物联网平台接收数据+物联网平台内置的lot Studio来实现网页上线显示数据

2、用点灯科技来实现app

先直接上代码，用的是blinker库

#define BLINKER_PRINT Serial
#define BLINKER_WIFI#include <Blinker.h>char auth[] = "";
char ssid[] = "";
char pswd[] = "";// 新建组件对象
BlinkerNumber Number1("num-gwy"); //xueyang
BlinkerNumber Number2("num-xoe"); //xinlvvoid setup() {// put your setup code here, to run once:// 初始化串口Serial.begin(115200);// 初始化有LED的IOpinMode(LED_BUILTIN, OUTPUT);digitalWrite(LED_BUILTIN, HIGH);// 初始化blinkerBlinker.begin(auth, ssid, pswd);
}void loop() {Number1.print(93);    //血氧测试数据Blinker.run();
}

外面的资料都比较少，只能看官方文档

3、MAX30102

直接上代码

void setup() {// put your setup code here, to run once:// 初始化串口Serial.begin(115200);#if defined(BLINKER_PRINT)BLINKER_DEBUG.stream(BLINKER_PRINT);#endif// 初始化有LED的IOpinMode(LED_BUILTIN, OUTPUT);digitalWrite(LED_BUILTIN, HIGH);// 初始化blinkerBlinker.begin(auth, ssid, pswd);// Initialize sensorif (!particleSensor.begin(Wire, I2C_SPEED_FAST)) //Use default I2C port, 400kHz speed{Serial.println(F("MAX30105 was not found. Please check wiring/power."));while (1);}byte ledBrightness = 60; //Options: 0=Off to 255=50mAbyte sampleAverage = 4; //Options: 1, 2, 4, 8, 16, 32byte ledMode = 2; //Options: 1 = Red only, 2 = Red + IR, 3 = Red + IR + Greenbyte sampleRate = 100; //Options: 50, 100, 200, 400, 800, 1000, 1600, 3200int pulseWidth = 411; //Options: 69, 118, 215, 411int adcRange = 4096; //Options: 2048, 4096, 8192, 16384particleSensor.setup(ledBrightness, sampleAverage, ledMode, sampleRate, pulseWidth, adcRange); //Configure sensor with these settings}void loop() {// put your main code here, to run repeatedly:bufferLength = 100; //buffer length of 100 stores 4 seconds of samples running at 25sps//read the first 100 samples, and determine the signal rangefor (byte i = 0 ; i < bufferLength ; i++){while (particleSensor.available() == false) //do we have new data?particleSensor.check(); //Check the sensor for new dataredBuffer[i] = particleSensor.getRed();irBuffer[i] = particleSensor.getIR();particleSensor.nextSample(); //We're finished with this sample so move to next sampleSerial.print(F("red="));Serial.print(redBuffer[i], DEC);Serial.print(F(", ir="));Serial.println(irBuffer[i], DEC);}//calculate heart rate and SpO2 after first 100 samples (first 4 seconds of samples)maxim_heart_rate_and_oxygen_saturation(irBuffer, bufferLength, redBuffer, &spo2, &validSPO2, &heartRate, &validHeartRate);//Continuously taking samples from MAX30102.  Heart rate and SpO2 are calculated every 1 secondwhile (1){//dumping the first 25 sets of samples in the memory and shift the last 75 sets of samples to the topfor (byte i = 25; i < 100; i++){redBuffer[i - 25] = redBuffer[i];irBuffer[i - 25] = irBuffer[i];}//take 25 sets of samples before calculating the heart rate.for (byte i = 75; i < 100; i++){while (particleSensor.available() == false) //do we have new data?particleSensor.check(); //Check the sensor for new datadigitalWrite(readLED, !digitalRead(readLED)); //Blink onboard LED with every data readredBuffer[i] = particleSensor.getRed();irBuffer[i] = particleSensor.getIR();particleSensor.nextSample(); //We're finished with this sample so move to next sample//send samples and calculation result to terminal program through UART//Serial.print(F("red="));//Serial.print(redBuffer[i], DEC);//Serial.print(F(", ir="));//Serial.print(irBuffer[i], DEC);Serial.print(F(", HR="));Serial.print(heartRate, DEC);Serial.print(F(", HRvalid="));Serial.print(validHeartRate, DEC);Serial.print(F(", SPO2="));Serial.print(spo2, DEC);Serial.print(F(", SPO2Valid="));Serial.println(validSPO2, DEC);}//After gathering 25 new samples recalculate HR and SP02maxim_heart_rate_and_oxygen_saturation(irBuffer, bufferLength, redBuffer, &spo2, &validSPO2, &heartRate, &validHeartRate);}Number1.print(spo2);Blinker.run();
}

但是不知道是不是模块问题还是我测量方式不对，好难测出准确的血氧数据= =

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【Esp32】用esp32和max30102制作一个血氧仪

【物资准备】

1、阿里云物联网平台

2、用点灯科技来实现app

3、MAX30102

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