Project Kreanova Banun

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 2, 16);

int sensorPin = A0; //A0 FOR ARDUINO SENSOR TURBIDITY
int pH = A1; //PH Sensor
int buf [10];

float ph (float voltage) {
  return 7 + ((2.5 - voltage) / 0.18) ;
}

void setup()
{
  // put your setup code here, to run once:
  pinMode (pH, INPUT);

  Serial.begin (115200);
  // initialize LCD
  lcd.begin();
  // turn on LCD backlight
  lcd.backlight();
}
void loop() {
   // put your main code here, to run repeatedly:
  lcd. setCursor (13,1) ;
  lcd.print ("      ") ;

  lcd. setCursor (13, 2) ;
  lcd.print ("      ") ;

  for (int i=0; i<10;i++)
  {
    buf[i]=analogRead(pH) ;
    delay (10) ;
  }


  float avgValue=0;
  for (int i=0;i<10;i++)
  avgValue+=buf [i];


  float pHVol=(float)avgValue*5.0/1024/10;
  float phValue = -5.70 * pHVol + 21.34;

  int sensorValue = analogRead(sensorPin);
  Serial.println(sensorValue);

  if (sensorValue >=550) {
    lcd.setCursor(0, 0);
    lcd.print("Status: Jernih");
    Serial.print(" its CLEAR ");
  }
  if ((sensorValue > 450) && (sensorValue < 550)) {
    lcd.setCursor(0, 0);
    lcd.print("Status: Keruh");
    Serial.print(" its CLOUDY ");
  }
  if  (sensorValue <= 450) {
    lcd.setCursor(0, 0);
    lcd.print("Status: Kotor");
    Serial.print(" its DIRTY ");
  }

  lcd. setCursor (0,1) ;
  lcd. print ("pH : ");
  lcd. print (ph (pHVol) , 2) ;

  delay(100);

}