FastBond体外检测之血氧心电检测

内容介绍

活动主题：

体外诊断，也就是国际上统称的IVD(In Vitro Diagnostic)，原理是通过试剂和体内物质在体外的反应强度或速度来判断体内物质的性质和数量，从而判断人体的生理状态，为医生治疗方案及用药提供重要的参考指标，是保证人类健康的医疗体系中不可或缺的一环。

项目功能介绍：

本次是一个很简单的小项目，主要功能一是心电检测，二是监测血氧和体温。

项目硬件及使用介绍：

本次我采用的是以Arduino为主控，以美信的MAX30102来监测血氧和体温，ADI的AD8232来进行心电检测的方案实现血氧心电体外检测检测。

心电监测中需注意RA的采集信号所用的贴应贴在右锁骨中线与第二肋间之交点；LA的采集信号所用的贴应贴在左锁骨中线与第二肋间之交点；RL的采集信号所用的贴应贴在右下腹。血氧与体温检测只需将手指紧贴放置至传感器上即可（这样其实测的是手指温度）。

关键代码：

Arduino主控代码：

void setup() {
  // put your setup code here, to run once:
      pinMode(10, INPUT); // Setup for leads off detection LO +
      pinMode(11, INPUT); // Setup for leads off detection LO -
      Serial.begin(9600);
      Serial.print("AT+SERRUP+90\r\n");delay(500);
      Serial.print("AT+SERRDOWN+60\r\n");delay(500);
      Serial.print("AT+SP+1\r\n");delay(500);
      while(Serial.read()>=0){}
}

int k=0;
char terminator = 'T';
char res_0,res1;
String T="";
int t;
String spo2="";
int sp2;
void loop() {
  // put your main code here, to run repeatedly:
  Serial.print("AT+T\r\n");
      while(Serial.available()){ 
           T=T+char(Serial.read());
           delay(2);
      }
      if(T.length()>0){
          res_0= T.indexOf('=');
          T=T.substring(res_0+1,res_0+4);
          t=T.toInt();
          Serial.print("t:");
          Serial.println(t);
          T="";
    }
    while(k<700) {
       if((digitalRead(10) == 1)||(digitalRead(11) == 1)){
        Serial.println('!');
      }
      else{
        // send the value of analog input 0:
          Serial.println(analogRead(A0));
      }
      //Wait for a bit to keep serial data from saturating
      delay(1);
      k++;
    }
    k=0;
    Serial.print("AT+SPO2\r\n");
     while(Serial.available()){ 
           spo2=spo2+char(Serial.read());
           delay(2);
      }
      if(spo2.length()>0){
          res1= spo2.indexOf('=');
          spo2=spo2.substring(res1+1);
          if (spo2 == "NU") {
              spo2 = "00";
            } else if (res1 == -1) {
              spo2 = "00";
            }
          sp2=spo2.toInt();
          Serial.print("spo2:");
          Serial.println(sp2);
          spo2="";
     }
    while(k<700) {
       if((digitalRead(10) == 1)||(digitalRead(11) == 1)){
        Serial.println('!');
      }
      else{
        // send the value of analog input 0:
          Serial.println(analogRead(A0));
      }
      //Wait for a bit to keep serial data from saturating
      delay(1);
      k++;
    }
    k=0;
}

processing上位机代码：

import processing.serial.*;

Serial myPort;        // The serial port
int xPos = 1;         // horizontal position of the graph
float height_old = 0;
float height_new = 0;
float inByte = 0;


void setup () {
  // set the window size:
  size(1000, 400);        

  // List all the available serial ports
  println(Serial.list());
  // Open whatever port is the one you're using.
  myPort = new Serial(this, Serial.list()[1], 9600);
  // don't generate a serialEvent() unless you get a newline character:
  myPort.bufferUntil('\n');
  // set inital background:
  background(0xff);
}


void draw () {
  // everything happens in the serialEvent()
}


void serialEvent (Serial myPort) {
  // get the ASCII string:
  String inString = myPort.readStringUntil('\n');
  if (inString != null) {
    // trim off any whitespace:
    inString = trim(inString);
    // If leads off detection is true notify with blue line
    if (inString.equals("!")) { 
      
      stroke(0, 0, 0xff); //Set stroke to blue ( R, G, B)
      inByte = 512;  // middle of the ADC range (Flat Line)
    }
    // If the data is good let it through
    else {
      stroke(0xff, 0, 0); //Set stroke to red ( R, G, B)
      inByte = float(inString); 
     }
     
     //Map and draw the line for new data point
     inByte = map(inByte, 0, 1023, 0, height);
     height_new = height - inByte; 
     line(xPos - 1, height_old, xPos, height_new);
     height_old = height_new;
    
      // at the edge of the screen, go back to the beginning:
      if (xPos >= width) {
        xPos = 0;
        background(0xff);
      } 
      else {
        // increment the horizontal position:
        xPos++;
      }
    
  }
}

功能演示结果：

使用示意图：

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