#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
float calibration_value = 21.34;
int phval = 0; 
unsigned long int avgval; 
int buffer_arr[10],temp;
void setup() {
 
  Serial.begin(9600); //Baud rate: 9600
  lcd.init(); 
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("   Welcome ");
  lcd.setCursor(0, 1);
  delay(2000);
  lcd.clear();
}
void phsensor () {
 for(int i=0;i<10;i++) 
 { 
 buffer_arr[i]=analogRead(A0);
 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;
 lcd.setCursor(0, 0);
 lcd.print("pH Val:");
 lcd.setCursor(8, 0);
 lcd.print(ph_act);
 delay(1000);
}
 
void turbiditysensor() {
  int sensorValue = analogRead(A0);   // read the input on analog pin 0:
  float voltage = sensorValue         * (5.0 / 1024.0); // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  Serial.println(voltage);          // print out the value you read:
  delay(500);
}
void loop(){
  phsensor ();
  turbiditysensor();
  }