STM32duino ECG OLED graph (심전도 그래프)

STM32duino를 이용한

심전도 표시장치

패드의 부착상태 때문에

움직이면 노이즈가 심하나

앉아 있는 상태에서 볼만하게 나옴

병원의 12 ECG는 아니고

AD8232를 이용한 2점 방식

 

외국자작 사이트

http://www.theorycircuit.com/heart-rate-monitor-ad8232-interface-arduino/

Heart Rate Monitor AD8232 Interface Arduino

 

STM32를 이용한 ECG 장치

 

코드 : 아두이노 IDE에서 STM32선택하고 

// ==============================================================
// I2C : Copyright (C)2015 Rinky-Dink Electronics, Henning Karlsen.
// All right reserved web: http://www.RinkyDinkElectronics.com/
// for Arduino Lib and works on STM32 too
// To use the hardware I2C (TWI) interface of the Arduino you must connect
// --------------------------------------------------------------
// STM32 Display : SDA pin -> PB10, SCL pin -> PB11
// --------------------------------------------------------------
// The internal pull-up resistors will be activated when using the
// hardware I2C interfaces.
// --------------------------------------------------------------
#include <OLED_I2C.h>
extern uint8_t SmallFont[];
OLED  myOLED(PB10, PB11, 8);	// OLED  myOLED(SDA, SCL, 8);
const int analogInputPin = PA0;
// --------------------------------------------------------------
double perspective = 100.0f;
long stime;
int x = 0, y = 0;
int lastx = 0, lasty = 0;
int LastTime = 0, ThisTime = 0;
bool BPMTiming = false;
bool BeatComplete = false;
int adcValue = 0, adcValueF = 0, BPM = 0;
#define UpperThreshold 560
#define LowerThreshold 530
// --------------------------------------------------------------
void setup() 
{
  myOLED.begin();
  myOLED.setFont(SmallFont);
  myOLED.clrScr();
  stime = micros();
  pinMode(PC14, INPUT); // Setup for leads off detection LO +
  pinMode(PC15, INPUT); // Setup for leads off detection LO -
  pinMode(analogInputPin, INPUT_ANALOG);
  Serial.begin(115200);
}
// --------------------------------------------------------------
void loop() 
{
  if (x > 127) 
  {		// OLED pixel : 128x64
    myOLED.clrScr();
    x = 0;
    lastx = x;
  }
  ThisTime = millis();
  if ((digitalRead(PC14) == 1) || (digitalRead(PC15) == 1)) {
    Serial.println('!');
  }
  else 
  {
    // send the value of analog input 0:
    adcValue = analogRead(analogInputPin) / 4; // STM32=12bits
    Serial.println(adcValue);
    detectBPM();
    displayBPM();
    delay(1);
  }
  stime = micros();
}
// --------------------------------------------------------------
void detectBPM() 
{
  // calc bpm
  if (adcValue > UpperThreshold) {
    if (BeatComplete) 
    {
      BPM = ThisTime - LastTime;
      BPM = int(60 / (float(BPM) / 1000));
      BPMTiming = false;
      BeatComplete = false;
      //tone(8,1000,250);
    }
    if (BPMTiming == false) 
    {
      LastTime = millis();
      BPMTiming = true;
    }
  }
  if ((adcValue < LowerThreshold) & (BPMTiming))
    BeatComplete = true;
}
// --------------------------------------------------------------
void displayBPM() 
{     	// display bpm
  y = 60 - (adcValue / 16);		// OLED pixel : 128x64
  myOLED.drawLine(lastx, lasty, x, y);
  //myOLED.update();
  lasty = y;
  lastx = x;
  //myOLED.drawRect(0,50,128,16);
  if(BPM<180 && BPM>10)
  {
    myOLED.printNumI(BPM, 0, 0, 3); // x=0,y=0,limit 3 digits
    myOLED.print(" BPM", 24, 0);
  }
  myOLED.update();
  x++;
}
// ==============================================================

 

 

코드 올리기 참조

https://diyworld.tistory.com/59

STM32duino 만들기

 

 

결선도

참고 : STM32 핀배열