【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_KEY
WiFiClient 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
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#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"); //xinlv
void setup() {
// put your setup code here, to run once:
// 初始化串口
Serial.begin(115200);
// 初始化有LED的IO
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, HIGH);
// 初始化blinker
Blinker.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IO
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, HIGH);
// 初始化blinker
Blinker.begin(auth, ssid, pswd);
// Initialize sensor
if (!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=50mA
byte sampleAverage = 4; //Options: 1, 2, 4, 8, 16, 32
byte ledMode = 2; //Options: 1 = Red only, 2 = Red + IR, 3 = Red + IR + Green
byte sampleRate = 100; //Options: 50, 100, 200, 400, 800, 1000, 1600, 3200
int pulseWidth = 411; //Options: 69, 118, 215, 411
int adcRange = 4096; //Options: 2048, 4096, 8192, 16384
particleSensor.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 range
for (byte i = 0 ; i < bufferLength ; i++)
{
while (particleSensor.available() == false) //do we have new data?
particleSensor.check(); //Check the sensor for new data
redBuffer[i] = particleSensor.getRed();
irBuffer[i] = particleSensor.getIR();
particleSensor.nextSample(); //We're finished with this sample so move to next sample
Serial.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 second
while (1)
{
//dumping the first 25 sets of samples in the memory and shift the last 75 sets of samples to the top
for (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 data
digitalWrite(readLED, !digitalRead(readLED)); //Blink onboard LED with every data read
redBuffer[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 SP02
maxim_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= =