#include <LiquidCrystal_I2C.h>

const int moisturePin = A0;
const int buzzerPin = D2;
const int relayPin = D3;
const int tankPin = D4;

int threshold = 300;

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  pinMode(relayPin, OUTPUT);
  pinMode(tankPin, INPUT_PULLDOWN);

  digitalWrite(relayPin, LOW);

  Serial.begin(115200);

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Smart Irrigation");
  lcd.setCursor(0, 1);
  lcd.print("System Starting");
  delay(2000);
  lcd.clear();
}

void loop() {
  int moisture = analogRead(moisturePin);
  int tankStatus = digitalRead(tankPin);

  Serial.print("Moisture: ");
  Serial.println(moisture);

  lcd.clear();

  // Tank empty
  if (tankStatus == LOW) {
    lcd.setCursor(0, 0);
    lcd.print("Tank Empty!");
    lcd.setCursor(0, 1);
    lcd.print("Pump OFF");

    digitalWrite(relayPin, LOW);

    tone(buzzerPin, 1000);
    delay(500);
    noTone(buzzerPin);
    delay(500);

    return;
  }

  // Dry soil
  if (moisture < threshold) {
    lcd.setCursor(0, 0);
    lcd.print("Dry Soil");
    lcd.setCursor(0, 1);
    lcd.print("Pump ON");

    Serial.println("Dry soil detected");
    Serial.println("Pump ON");

    digitalWrite(relayPin, HIGH);

    tone(buzzerPin, 1500);

    delay(5000);

    digitalWrite(relayPin, LOW);
    noTone(buzzerPin);

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Pump OFF");
    lcd.setCursor(0, 1);
    lcd.print("Timer Complete");

    delay(2000);
  }

  // Wet soil
  else {
    lcd.setCursor(0, 0);
    lcd.print("Soil OK");
    lcd.setCursor(0, 1);
    lcd.print("No Watering");

    digitalWrite(relayPin, LOW);
    noTone(buzzerPin);

    Serial.println("Soil moisture sufficient");

    delay(1000);
  }
}