Arduino Code for Blood Glucose Detector Electronic Reader

Arduino Code for Blood Glucose Detector Electronic Reader

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######## Code Start Here ##########################

#include <Wire.h>
#include <SPI.h>  //
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);


int glucoinput1 = 0;
int glucoinput2 = 1;
int differential_data;
int push_button = 4;
int buttonval = 0;
int state = 0;

unsigned long int avgValue;  //Store the average value of the sensor feedback
float b;
int buf[10],temp;
float overal_data;
float volt_gluco;
float gluco;
float gluco_mmol;

void setup() {
  Serial.begin(9600);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  pinMode(push_button,INPUT);
  display.clearDisplay();
}

void loop() {
  buttonval = digitalRead (push_button);
  Serial.println(overal_data);
  if (state == 0) {
        display.setTextSize(1.8);
        display.setTextColor(WHITE);
        display.setCursor(10,0);
        display.print("WELCOME to E-Reader"); display.print(""); //OLED display
        display.setTextSize(1);
        display.setTextColor(WHITE);
        display.setCursor(24,15);
        display.print("Insert Strip &"); display.print(""); //OLED display
        display.setTextSize(1.2);
        display.setTextColor(WHITE);
        display.setCursor(45,25);
        display.print("Press >"); display.print(""); //OLED display
          display.display();
        if (buttonval == 0) {
          display.clearDisplay();
          delay(1000);
          state = 1;
        }
    }

   else if (state == 1) {
    display.setTextSize(1.5);
    display.setTextColor(WHITE);
    display.setCursor(17,5);
    display.print("Please Put Blood"); display.print(""); //OLED display
    display.setTextSize(1.5);
    display.setTextColor(WHITE);
    display.setCursor(20,15);
    display.print("In Test Strip"); //OLED display
    display.display();
  differential_data = chan_diff();
  for(int i=0;i<10;i++)       //Get 10 sample value from the sensor for smooth the value
  {
    buf[i]=differential_data;
    delay(10);
  }
  for(int i=0;i<9;i++)        //sort the analog from small to large
  {
    for(int j=i+1;j<10;j++)
    {
      if(buf[i]>buf[j])
      {
        temp=buf[i];
        buf[i]=buf[j];
        buf[j]=temp;
      }
    }
  }
  avgValue=0;
  for(int i=2;i<8;i++)  //take the average value of 6 center sample
    avgValue+=buf[i];
  overal_data=(float)avgValue/6; //convert the analog into millivolt
  volt_gluco=overal_data*5/1023; //to get voltage value in V
  gluco=(volt_gluco-2.6835)/0.00185; //to get glucose level in mg/dl
  gluco_mmol=gluco/18; //to get glucose level in mmol/L
    if (overal_data >= 570 && overal_data <= 670) {
    state=2;
   
  }
   }

    else if (state==2){
      for (int count=5;count>=1;count--) {
        display.setTextSize(3);
        display.setTextColor(WHITE);
        display.setCursor(60,5);
        display.print(count); display.print(""); //display count from 5 to 1
        display.display();
        delay(1000);
        display.clearDisplay();
      }
      state = 3;
    }

    else if (state == 3) {
        Serial.println(gluco);
  Serial.println(overal_data);
  Serial.println(gluco_mmol);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(25,0);
  display.print("Voltage:"); display.print(volt_gluco); display.println(" V"); //Voltage generated from the reaction
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(25,9);
  display.print("Glucose level: "); //OLED display
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(30,17);
  display.print(gluco); display.println(" mg/dL"); //OLED display glucose level in mg/dl
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(30,25);
  display.print(gluco_mmol); display.println(" mmol/L"); //OLED Dispay glucose level in mmol/L
  display.display();
  delay(2000);
    }
}


int chan_diff () //function for differential mode
{
  analogRead (glucoinput1) ;
  delay (10) ;
  int ch1 = analogRead (glucoinput1) ;
  analogRead (glucoinput2) ;
  delay (10) ;
  int ch2 = analogRead (glucoinput2) ;
  ch1 += analogRead (glucoinput1) ;
  ch1 >>= 1 ;
  return ch1 - ch2 ;
}