Sensor PH Arduino – Ukur Sensor PH dengan arduino uno

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

// membaca nilai analog pin A0 
const int phSensorPin  = A0; 
//  hasil  perhitungan  =  (TeganganPhA  -  TeganganPhB)  / (phB - phA) 
float kalibrasi = 0.165;

void setup() {
  pinMode (phSensorPin, INPUT);
  Serial.begin(9600);
  //lcd.init();
  lcd.begin(); 
  lcd.backlight();
  lcd.setCursor(3,0);
  lcd.print("Monitoring"); 
  lcd.setCursor(5,1);  
  lcd.print("PH Air");   
  delay(2000);    
  } 

void loop() {    
  int nilaiPengukuranPh = analogRead(phSensorPin);
  Serial.print("ADC Ph:");
  Serial.print(nilaiPengukuranPh); 
  
  // rumus menentukan nilai TeganganPh   
  float TeganganPh = 5.0 / 1024.0 * nilaiPengukuranPh;     
  
  // rumus menentukan nilai pH cairan    
  float nilaiPh = 6.86+((2.68 - TeganganPh)/kalibrasi);  
  Serial.print("   Tegangan Ph:");    
  Serial.print(TeganganPh, 2); 
  Serial.print("   Nilai Ph:");
  Serial.print(nilaiPh, 2);


lcd.clear();    
lcd.setCursor(5, 0);
lcd.print(nilaiPh, 2);
lcd.setCursor(0,0);    
lcd.print("PH : ");
lcd.setCursor(0,1);
lcd.print("Status : ");

if(nilaiPh > 7.5 ){
  //pH basa lebih dari 7.5    
  lcd.setCursor(9, 1);    
  lcd.print("Basa");    
  Serial.println("   Status : Basa");    
  }
  else if(nilaiPh > 6.4){
    //pH netral 6.5 - 7.5    
    lcd.setCursor(9, 1);
    lcd.print("Netral");
    Serial.println("   Status : Netral");
    }    
    else {
      //pH asam kurang dari 6.5
      lcd.setCursor(9, 1);    
      lcd.print("Asam");    
      Serial.println("   Status : Asam");   
      }    
      delay(2000);  
 }