以stm32f103c8t6为主控制器，以max30102作为心率血氧传感器，主控制器采集到心率和血氧浓度以后，使用esp8266模块将数据发送到阿里云，并且能够在手机上显示实时数据

可以使用以下代码实现：

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_MAX30102.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>

// WiFi信息
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// 阿里云信息
const char* mqtt_server = "your_MQTT_SERVER";
const char* mqtt_username = "your_MQTT_USERNAME";
const char* mqtt_password = "your_MQTT_PASSWORD";
const char* mqtt_topic = "your_MQTT_TOPIC";

// WiFi客户端和MQTT客户端
WiFiClient espClient;
PubSubClient client(espClient);

// 心率血氧传感器
Adafruit_MAX30102 particleSensor;

void setup() {
  // 初始化串口
  Serial.begin(115200);

  // 初始化WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // 初始化MQTT客户端
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);

  // 初始化心率血氧传感器
  if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) {
    Serial.println("MAX30102 not found");
    while (1);
  }
  particleSensor.setup();
  particleSensor.setPulseAmplitudeRed(0x0A);
  particleSensor.setPulseAmplitudeGreen(0);
}

void loop() {
  // 连接MQTT服务器
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  // 读取心率和血氧浓度
  float hr = particleSensor.getHeartRate();
  float spo2 = particleSensor.getSpO2();

  // 发送数据到阿里云
  char message[50];
  sprintf(message, "{\"hr\":%.2f,\"spo2\":%.2f}", hr, spo2);
  client.publish(mqtt_topic, message);

  // 打印数据到串口
  Serial.print("Heart rate: ");
  Serial.print(hr);
  Serial.print(" bpm, SpO2: ");
  Serial.print(spo2);
  Serial.println(" %");

  // 延时1秒
  delay(1000);
}

void callback(char* topic, byte* payload, unsigned int length) {
  // 处理MQTT消息
}

void reconnect() {
  // 重新连接MQTT服务器
  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");
    if (client.connect("ESP8266Client", mqtt_username, mqtt_password)) {
      Serial.println("Connected to MQTT");
      client.subscribe(mqtt_topic);
    } else {
      Serial.print("Failed to connect to MQTT, rc=");
      Serial.print(client.state());
      Serial.println(" retrying in 5 seconds");
      delay(5000);
    }
  }
}

注意：在使用这段代码之前，你需要先在阿里云上创建一个MQTT实例，并且在代码中填写正确的WiFi信息、阿里云信息和MQTT主题。