#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <HX711.h>

#define LOADCELL_DOUT_PIN  5
#define LOADCELL_SCK_PIN  4

LiquidCrystal_I2C lcd(0x27, 16, 2);
HX711 scale;

const int batteryAnalogPin = A0;  
const int pHAnalogPin = A1;      
float batteryVoltage = 0.0;
float maxBatteryVoltage = 12.6;  
float minBatteryVoltage = 10.0; 
float voltageDividerRatio = (10.0 + 4.7) / 4.7; 
float pHValue = 0.0;

void setup() {
  Serial.begin(9600);  

  lcd.begin(16, 2);  
  lcd.backlight();  
  lcd.setCursor(0, 0);
  lcd.print("Batt Lvl");
  lcd.setCursor(10, 0);
  lcd.print("pH");
  lcd.setCursor(13, 0);
  lcd.print("W");

  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  scale.set_scale(2280.f); 
  scale.tare();

}

void loop() {
// battery percentage
  int batteryAnalogValue = analogRead(batteryAnalogPin);  
  float measuredVoltage = (batteryAnalogValue * 5.0) / 1023.0; 
  batteryVoltage = measuredVoltage * voltageDividerRatio; 

  float batteryPercentage = ((batteryVoltage - minBatteryVoltage) / (maxBatteryVoltage - minBatteryVoltage)) * 100;
  if (batteryPercentage > 100) {
    batteryPercentage = 100;
  } else if (batteryPercentage < 0) {
    batteryPercentage = 0;
  }

  lcd.setCursor(0, 1);
  lcd.print(batteryVoltage,2);
  lcd.print("V ");

  lcd.setCursor(7, 1);
  lcd.print((int)batteryPercentage);
  lcd.print("% ");

//PH
  int pHAnalogValue = analogRead(pHAnalogPin); 
  pHValue = (pHAnalogValue * 5.0) / 1023.0;

  lcd.setCursor(10, 1);
  lcd.print((int)pHValue);

//weight sensor
  float weight = scale.get_units(10);
  lcd.setCursor(13, 1); 
  lcd.print(weight, 2); 

  Serial.print("Weight: ");
  Serial.print(weight, 2);

  delay(1000);  // Update every second
}