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

#define SOIL_SENSOR_PIN A0
#define RELAY_PIN 2

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 cols, 2 rows

void setup() {
  pinMode(SOIL_SENSOR_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW); // Motor OFF initially

  lcd.begin(16, 2);   // <- FIXED HERE
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Desert Farming");
  lcd.setCursor(0, 1);
  lcd.print("System Starting");
  delay(2000);
  lcd.clear();
}
void loop() {
  int sensorValue = analogRead(SOIL_SENSOR_PIN);
  
  // Convert analog value (0–1023) to percentage (0–100)
  int moisturePercent = map(sensorValue, 1023, 0, 0, 100);
  moisturePercent = constrain(moisturePercent, 0, 100); // Limit range

  lcd.setCursor(0, 0);
  lcd.print("Moisture: ");
  lcd.print(moisturePercent);
  lcd.print("%   ");

  if (moisturePercent < 20) {
    digitalWrite(RELAY_PIN, HIGH); // Pump ON
    lcd.setCursor(0, 1);
    lcd.print("Soil Dry:Mot_ON");
  }
  else if (moisturePercent > 60) {
    digitalWrite(RELAY_PIN, LOW); // Pump OFF
    lcd.setCursor(0, 1);
    lcd.print("Soil Wet:Mot_OFF");
  }
  else {
    // Mid-range: optional keep motor status unchanged or off
    digitalWrite(RELAY_PIN, LOW);
    lcd.setCursor(0, 1);
    lcd.print("Soil OK:Mot_OFF ");
  }

  delay(2000);
}