/*
  ESP32 Data Types Demo
  Demonstrates: int, char, float, boolean, String, and arrays
*/

// Constants
#define LED_PIN 2       // Built-in LED pin
const float pi = 3.14159;

// Global Variables
int counter = 10;       // Integer
float voltage = 3.3;    // Float (decimal)
boolean isActive = true;// Boolean (true/false)
char grade = 'A';       // Single character
String message = "Hello from ESP32"; // String

// Arrays
int numbers[3] = {10, 20, 30};      // Integer array
String colors[4] = {"Red", "Green", "Blue", "Yellow"}; // String array

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);

  // Print all variables
  Serial.println("=== Basic Data Types ===");
  Serial.println("Integer: " + String(counter));
  Serial.println("Float: " + String(voltage));
  Serial.println("Boolean: " + String(isActive));
  Serial.println("Character: " + String(grade));
  Serial.println("String: " + message);
  Serial.println("Constant PI: " + String(pi, 4)); // 4 decimal places

  // Control LED with boolean
  digitalWrite(LED_PIN, isActive);

  // Demonstrate array access
  Serial.println("\n=== Array Examples ===");
  Serial.println("First number: " + String(numbers[0]));
  Serial.println("Third color: " + colors[2]);

  // Modify values
  counter = 100;
  voltage = 5.0 / 2.0; // Results in 2.5
  isActive = false;

  Serial.println("\n=== Modified Values ===");
  Serial.println("New Integer: " + String(counter));
  Serial.println("New Float: " + String(voltage));
  Serial.println("New Boolean: " + String(isActive));
}

void loop() {
  // Empty (example runs once)
}