Monitor Peak Flow / Peak Expiratory Flow Rate (PEF) Sensor Water / Air Flow untuk Penyakit Asma

Monitor Peak Flow / Peak Expiratory Flow Rate (PEF) Sensor Water / Air Flow untuk Deteksi Penyakit Asma

           Pada kesempatan kali ini saya akan menjelaskan mengenai bagaimana cara membuat sebuah alat yang bisa memonitor flow rate untuk deteksi penyakit asma. jadi alat ini sangatlah sederhana karena menggunakan satu sensor yaitu water flow sensor, jadi data yang diambil yaitu flow rate hembusan pertama lalu hembusan kedua setelah itu dimasukkan kedalam rumus sehingga didapatkanlah hasilnya. untuk lebih jelasnya berikut koding dan komponennya.

a. Arduino Mega

b. Sensor Flow

c. LCD 20x4 + I2C

d. Program Aduino IDE

#include "Wire.h"

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

byte sensorInterrupt = 0;  // 0 = digital pin 2

byte sensorPin       = 2;

float calibrationFactor = 4.5;

int flowMilliLitres1;

int flowMilliLitres2;

int FLMa;

int FLMb;

volatile byte pulseCount;

unsigned int  frac;

float flowRate;

unsigned int flowMilliLitres;

float totalMilliLitres;

int tbmulai = 12;

int tbmulaix;

unsigned long oldTime;

unsigned long start_times[100];

unsigned long stop_times[100];

unsigned long values[100];

int i1;

float z1;

int i2;

float z2;

int counter1;

int counter2;

float rumus;

void setup() {

  

  //lcd.init();

  //lcd.backlight(); 

  lcd.begin();

  pinMode(tbmulai, INPUT_PULLUP);

  pinMode(sensorPin, INPUT);

  digitalWrite(sensorPin, HIGH);

  lcd.setCursor(4, 0);

  lcd.print("ALAT");

  lcd.setCursor(1, 1);

  lcd.print("ALAT UKUR ASMA");

  delay(3000);

  lcd.clear();

  pulseCount        = 0;

  flowRate          = 0.0;

  flowMilliLitres   = 0;

  totalMilliLitres  = 0;

  oldTime           = 0;

  attachInterrupt(sensorInterrupt, pulseCounter, FALLING);

}

void loop() {

tbmulaix = digitalRead(tbmulai);  

if(tbmulaix == 0){

  z1 = 0;

  z2 = 0;

  lcd.clear();

  mulai1(); //berlangsung 10 detik

  mulai2(); //berlangsung 10 detik 

}

if(z1 > z2){

rumus = (z1 - z2) / z1;

rumus = rumus * 100.0; 

lcd.setCursor(0, 3);

lcd.print("FL1 > FL2");

}

if(z2 > z1){

rumus = (z2 - z1) / z2;

rumus = rumus * 100.0; 

lcd.setCursor(0, 3);

lcd.print("FL1 < FL2");

}

  lcd.setCursor(0, 0);

  lcd.print("Hasil= ");

  lcd.print(rumus);

  lcd.print("  % ");

  lcd.setCursor(0, 1);

  lcd.print("FL1= ");

  lcd.print(z1);

  lcd.print("   ");

  lcd.setCursor(0, 2);

  lcd.print("FL2= ");

  lcd.print(z2);

  lcd.print("   ");  

delay(200);

}

void mulai1(){

counter1++; //countup

  //mencari nilai tertinggi

  for(i1=0;i1<100;i1++) {

    start_times[i1] = micros();

  //aktifkan sensor flow

  if((millis() - oldTime) > 1000)

  {

    detachInterrupt(sensorInterrupt);

    flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;

    oldTime = millis();

    flowMilliLitres1 = (flowRate / 60) * 1000;

    totalMilliLitres += flowMilliLitres1;

    pulseCount = 0;   

    attachInterrupt(sensorInterrupt, pulseCounter, FALLING);

  }

  //nilai dimasukkan ke values

  values[i1] = flowMilliLitres1;            

  //bandingkan nilai yg terbesar

  if (values[i1] >= z1) {

  z1 = values[i1]; //nilai terbesar dimasukkan ke z1

  }

   

    stop_times[i1] = micros(); //stop pengukuran

  }

  //menampilkan nilai tertinggi ke lcd atas

  lcd.setCursor(0, 0);

  lcd.print("FL1= ");

  lcd.print(z1);

  lcd.print("  mL/s ");

if(counter1 > 1000){ //jika sudah 10 detik maka selesai 1000 * 10ms = 10000 ms

counter1 = 0; //reset counter  

return; //kembali ke loop

}

delay(10); //waktu looping

mulai1();    

}

void mulai2(){

counter2++; //countup

  //mencari nilai tertinggi

  for(i2=0;i2<100;i2++) {

    start_times[i2] = micros();

  //aktifkan sensor flow  

  if((millis() - oldTime) > 1000)

  {

    detachInterrupt(sensorInterrupt);

    flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;

    oldTime = millis();

    flowMilliLitres2 = (flowRate / 60) * 1000;

    totalMilliLitres += flowMilliLitres2;

    pulseCount = 0;  

    attachInterrupt(sensorInterrupt, pulseCounter, FALLING);

  }

  

  //nilai dimasukkan ke values

  values[i2] = flowMilliLitres2;            

  //bandingkan nilai yg terbesar

  if (values[i2] >= z2) {

  z2 = values[i2]; //nilai terbesar dimasukkan ke z1

  }

 

    stop_times[i2] = micros(); //stop pengukuran

  }

  //menampilkan hasilnya ke lcd bawah

  lcd.setCursor(0, 1);

  lcd.print("FL2= ");

  lcd.print(z2);

  lcd.print("  mL/s ");

  if(counter2 > 1000){ //jika sudah 10 detik maka selesai 10ms x 1000 = 10000 ms

  counter2 = 0; //reset nilai counter 

  lcd.clear(); //clear nilai lcd

  delay(1000); //delay 1 detik

  return; //kembali ke void loop

  }

  delay(10); //waktu sampli 10ms

  mulai2();    

}

//counter nilai flow

void pulseCounter()

{

  pulseCount++;

}

e. VIDEO HASILNYA