//#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display


// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to

//float calibration_value = 21.34;
float calibration_value = 28.62;
int phval = 0; 
unsigned long int avgval; 
int buffer_arr[10],temp;

int t_sens = 1; // analog pin 1
int val_t ;
float temper;


void setup() 
{
  lcd.init();                      // initialize the lcd 
  lcd.backlight();
 Serial.begin(9600);
  
  lcd.begin(20, 4);
    pinMode(t_sens,INPUT);
  
}
void loop() {
 for(int i=0;i<10;i++) 
 { 
 buffer_arr[i]=analogRead(0);
 delay(30);
 }
 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;
 
//temperature sensor
  val_t=analogRead(t_sens);
  temper = val_t * 5.0/1024*49;
//  Serial.print("volt value :");
//  Serial.print(val);
  Serial.print("Temperature :");
  Serial.print(temper);
  Serial.print("       PH :");
  Serial.println(ph_act);
//  Serial.println(volt);
  
 lcd.setCursor(0, 0);
 lcd.print("pH Val :");
 lcd.setCursor(8, 0);
 lcd.print(ph_act);

 lcd.setCursor(0, 1);
 lcd.print("Temp(C):");
 lcd.setCursor(8, 1);
 lcd.print(temper);

 lcd.setCursor(6, 3);
 lcd.print("Iwan-FA2022");
 delay(1000);
}