#include <LiquidCrystal.h>    // Include the LCD library

// LCD pins connected to ESP32
const int rs = 22;
const int en = 23;
const int d4 = 19;
const int d5 = 18;
const int d6 = 17;
const int d7 = 16;

// Buzzer and LED pins connected to ESP32
const int buzzerPin = 2;
const int ledPin = 13;

// Initialize the LCD
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

void setup() {
  lcd.begin(16, 4);  // Initialize the LCD with 16 columns and 4 rows
  pinMode(buzzerPin, OUTPUT); // Initialize buzzer pin as output
  pinMode(ledPin, OUTPUT); // Initialize LED pin as output
  
  lcd.setCursor(0, 0);
  lcd.print("PROJECT DONE BY:");
  lcd.setCursor(3, 1);
  lcd.print("GERALD WATHUTA");
  lcd.setCursor(2, 2);
  lcd.print("STEPHEN MUTINDA");
  delay(10000); // Welcome message delay
}

void loop() {
  // Simulated weight values
  float weight = 0;

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Max weight: 2500g");
  lcd.setCursor(0, 1);
  lcd.print("Weight: ");
  lcd.print(weight, 0); // Print simulated weight in grams with no decimal places
  lcd.print("g");

  delay(1000); // Delay between updates
  
  // Simulate increasing weight when loaded
  for (int i = 0; i <= 2500; i += 100) {
    weight = i;
    updateDisplay(weight);
    if (weight > 2500) {
      activateBuzzer();
      activateLED();
    }
    delay(1000); // Delay for demonstration purposes
  }
  
  // Simulate decreasing weight when offloaded
  for (int i = 2500; i >= 0; i -= 100) {
    weight = i;
    updateDisplay(weight);
    if (weight > 2500) {
      activateBuzzer();
      activateLED();
    }
    delay(1000); // Delay for demonstration purposes
  }
}

void updateDisplay(float weight) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Max weight: 2500g");
  lcd.setCursor(0, 1);
  lcd.print("Weight: ");
  lcd.print(weight, 0); // Print simulated weight in grams with no decimal places
  lcd.print("g");
}

void activateBuzzer() {
  digitalWrite(buzzerPin, HIGH); // Turn on buzzer
  delay(1000); // Buzz for 1 second
  digitalWrite(buzzerPin, LOW); // Turn off buzzer
}

void activateLED() {
  digitalWrite(ledPin, HIGH); // Turn on LED
}