Li-Ion battery measurement system

#include <LiquidCrystal.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
#include <MillisTimer.h>

#include <SoftwareSerial.h>

SoftwareSerial mySerial(8, 7); // RX, TX

#define HallS A2; //pin Hallovog senzora 
#define LM35 A1; // pin  temperaturnog senzora
#define cellPin A0; //pin  baterije



float temperatura;  //varijabla u koju pohranjujemo temperaturu
float vout;  //trenutna  varijabla za očitanje senzora temperature
float V;    // varijabla napona kojega očitava Hallov senzor s A2 pina
float ImA; // Varijabla struje u miliamperima
float IA;    // varijabla struje u amperima
float v;      // varijabla napona baterije
float mv = 0;    //napon baterije u milivoltima
const float mvc = 5; // napon rada mikrokontrolera
float uzorci = 0;
float Capacity = 0.0;  // varijabla kapaciteta
unsigned long previousMillis = 0; // prethodno vrijeme u ms
unsigned long millisPassed = 0;  // trenutačno vrijeme u ms


void setup()
{
  pinMode(A1, INPUT); // Configuring pin A1 as input
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();

  mySerial.begin(9600);

  delay(1000);

}


void loop()

{

  //MJERENJE TEMPERATURE
  vout = analogRead(A1);
  vout = (vout * 500) / 1023;

  temperatura = vout; // temperatura u stupnjevima celzijusevim


  Serial.print("temp=");
  Serial.print(temperatura);
  Serial.print(" °C\n");

  mySerial.print("temp=");
  mySerial.print(temperatura);
  mySerial.println(" °C\n");


  delay(1000); //Delay of 1 second for ease of viewing in serial monitor




  //MJERENJE STRUJE


  V = analogRead(A2); //očitavanje napona s pina A2
  delay(10);

  V = (V / 1023) * 5;                                              // prebacivanje digitalne ADC vrijednosti u napone
  V = V - 2.500;                                                   // Subtract the zero current value Nominally 2.500V
  V = V * 1000;                                                    // pretvaranje napona iz volta u milivolte
  ImA = abs((V / 400) * 1000); // prebacaivanje napona sa senzora u struju
  IA = ImA / 1000;
  Serial.print("ImA = "); Serial.print(ImA); Serial.println(" mA\n");
  if (IA < 0.01) {
    lcd.setCursor(7, 0);  //ispis struje
    lcd.print("noCurrent");

  }

  mySerial.print("ImA=");
  mySerial.print(ImA);
  mySerial.println("mA\n");

  delay(1000);

  //MJERENJE NAPONA


  uzorci = analogRead(A0);
  mv = uzorci * mvc;
  v = mv / 1000;
  Serial.print("V="); Serial.print(String(v)); Serial.print("V\n");

  mySerial.print("V=");
  mySerial.print(v);
  mySerial.println("V\n");


  delay(100);

  //MJERENJE KAPACITETA


  if ( mv > 4400 ) {

    //Serial.println( "Warning High-V! ");

    lcd.setCursor(0, 1);
    lcd.print("HIGH-V");



    //delay(1000);
  }

  else if (mv < 3000) {

    Serial.println( "Warning Low-V! ");

    lcd.setCursor(0, 1);
    lcd.print("LOW-V");

    delay(1000);
  }
  else if (mv > 3000 && mv < 4300  ) { // provjera je li napon baterije u sigurnim granicama

    millisPassed = millis() - previousMillis;

    Capacity = Capacity + ImA * (millisPassed / 3600000.0); // 1 Hour = 3600000ms
    previousMillis = millis();
    Serial.print("C=");
    Serial.print(Capacity);
    Serial.print("mAh\n");

    mySerial.print("C= ");
    mySerial.print(Capacity);
    mySerial.println(" mAh\n");

    lcd.begin(16, 2);                       //ispis kapaciteta na LCD
    lcd.setCursor(7, 1);
    lcd.print(Capacity, 1);
    lcd.print("mAh");


    lcd.setCursor(0, 1);   //ispis napona
    lcd.print(v, 1);
    lcd.print("V");

    lcd.setCursor(7, 0);  //ispis struje
    lcd.print(ImA, 0);
    lcd.print("mA");


    lcd.setCursor(0, 0);   //ispis temperature
    lcd.print(temperatura, 0);
    lcd.print("*C");





  }


  delay(1000);