#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);
float calibration_value = 21.34;
int phval = 0; 
unsigned long int avgval; 
int buffer_arr[10],temp;
byte LEITOYRGIA=1;

void setup() {


LCD_DAT(); //--Συνάρτηση Χρήστη--

}


void loop() {


Read_A0(); //--Συνάρτηση Χρήστη--



if (LEITOYRGIA==0){

 for(int i=0;i<9;i++)
 {
 for(int j=i+1;j<10;j++)
 {
 if(buffer_arr[i]>buffer_arr[j])
 {
 temp=buffer_arr[i];
 buffer_arr[i]=buffer_arr[j];
 buffer_arr[j]=temp;
 }
 }
 }
 avgval=0;
 for(int i=2;i<8;i++)
 avgval+=buffer_arr[i];
 float volt=(float)avgval*5.0/1024/6;
 float ph_act = -5.70 * volt + calibration_value;
 lcd.setCursor(0, 0);
 lcd.print("pH Val:");
 lcd.setCursor(8, 0);
 lcd.print(ph_act);
 delay(1000);
}

if (LEITOYRGIA==1) {
  //Serial.print("NO FORMAT");
  key_board();
  //LCD_DAT();
}

}




//---------Συναρτήσεις-----------
//-----LCD_DAT()=Αρχικό μήνυμα------
 void LCD_DAT(){
  int delay_dat=4000;

Serial.begin(9600);
  lcd.init(); 
  lcd.begin(20, 2);
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print(" Welcome Ph ");
  lcd.setCursor(0, 3);
  lcd.print("meter-Controller");
  delay(delay_dat);
  lcd.clear();
  
  lcd.setCursor(0, 0);
  lcd.print(" Model PhCn-100");
  lcd.setCursor(0, 1);
  lcd.print("Range=0-14");
  delay(delay_dat);
  lcd.clear();
  }








//---------

int Read_A0(){
for(int i=0;i<10;i++) 
 { 
 buffer_arr[i]=analogRead(A0);
 delay(30);
 }
 }

int key_board(){
//  pinMode(A0, INPUT);
int sensorValue = analogRead(A0);
//Serial.begin(9600);
Serial.println("sensorValue");
//Serial.print("NO FORMAT---");
}