#include <LiquidCrystal_I2C.h>

// Initialize the library with the numbers of the interface pins
LiquidCrystal_I2C lcd(0x27, 20, 4);

const int potentiometerPin = A0; // Potentiometer connected to analog pin A0
const int relayPin = 7;          // Relay connected to digital pin 7
const int ledPin = 3;            // LED connected to digital pin 3

int moistureLevel = 0;
const int moistureThresholdLow = 50;   // Threshold for low moisture level
const int moistureThresholdHigh = 75;  // Threshold for high moisture level

unsigned long previousMillis = 0;      // will store last time the moisture was updated
const long interval = 1000;           // interval at which to update the moisture reading (10 seconds)

void setup() {
  // Set up the LCD's number of columns and rows:
  lcd.init();
  lcd.backlight();

  pinMode(relayPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  digitalWrite(relayPin, LOW); // Start with the sprinkler off
  digitalWrite(ledPin, LOW);   // Start with the LED off
}

void loop() {
  // Get current time
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    // save the last time you updated the moisture level
    previousMillis = currentMillis;
    
    // Read the value from the potentiometer
    moistureLevel = analogRead(potentiometerPin);
    
    // Map the potentiometer value to a percentage (0 - 100)
    int moisturePercentage = map(moistureLevel, 0, 1023, 0, 100);
    
    // Clear the LCD and set the cursor to the beginning
    lcd.clear();
    lcd.setCursor(0, 0);
    
    // Display the current simulated moisture level
    lcd.print("Moisture: ");
    lcd.print(moisturePercentage);
    lcd.print("%");

    // Check if moisture level is too low or too high
    if (moisturePercentage < moistureThresholdLow || moisturePercentage > moistureThresholdHigh) {
      lcd.setCursor(0, 1);
      lcd.print("Sprinkler Activated!");
      digitalWrite(relayPin, HIGH); // Turn on the relay
      digitalWrite(ledPin, HIGH);   // Turn on the LED
    } else {
      digitalWrite(relayPin, LOW);  // Turn off the relay
      digitalWrite(ledPin, LOW);    // Turn off the LED
    }
  }
}