#include <SD.h>
#include <SPI.h>
#include <Adafruit_ILI9341.h>

// Define Pins
#define SD_CS 4
#define TFT_CS 10
#define TFT_DC 9
#define TFT_RST 8
#define START_BUTTON_PIN 2  // Pin para el botón "START"
#define NEXT_BUTTON_PIN 3   // Pin para el botón "SIGUIENTE"

// Define Variables
int pot1 = A0;
int pot2 = A1;
int pot1Val;
int pot2Val;

// Create TFT Object
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

// Create SD Object
File root;

void setup() {
  // Initialize Serial
  Serial.begin(9600);

  // Initialize TFT
  tft.begin();

  // Initialize SD
  Serial.print("Initializing SD card...");
  if (!SD.begin(SD_CS)) {
    Serial.println("Initialization failed!");
    return;
  }
  Serial.println("Initialization done.");
  root = SD.open("/");
}

void loop() {
  // Read Potentiometer Values
  pot1Val = analogRead(pot1);
  pot2Val = analogRead(pot2);

  // Draw Start Button
  tft.fillScreen(ILI9341_BLACK);
  tft.fillRoundRect(20, 20, 200, 60, 10, ILI9341_BLUE);
  tft.setCursor(50, 40);
  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(2);
  tft.print("START");

  // Wait for the "START" button to be pressed
  while (digitalRead(START_BUTTON_PIN) == HIGH) {
    delay(1000);
  }

  // Step 1
  tft.fillScreen(ILI9341_BLACK);
  tft.setCursor(50, 40);
  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(2);
  tft.print("PASO 1");

  // Record Potentiometer Values for 25 Seconds
  unsigned long startTime = millis();
  while (millis() - startTime < 25000) {
    pot1Val = analogRead(pot1);
    pot2Val = analogRead(pot2);
    delay(10);
  }

  // Check if Potentiometer Values are Within Range
  if (pot1Val >= 4500 && pot1Val <= 6500 && pot2Val >= 4500 && pot2Val <= 6500) {
    tft.fillScreen(ILI9341_BLACK);
    tft.setCursor(50, 40);
    tft.setTextColor(ILI9341_WHITE);
    tft.setTextSize(2);
    tft.print("PASO 1 EN CORRECTO ESTADO");
  } else {
    tft.fillScreen(ILI9341_BLACK);
    tft.setCursor(50, 40);
    tft.setTextColor(ILI9341_WHITE);
    tft.setTextSize(2);
    tft.print("PASO 1: EN MAL ESTADO");
  }

  // Draw Next Button
  tft.fillRoundRect(20, 100, 200, 60, 10, ILI9341_BLUE);
  tft.setCursor(50, 120);
  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(2);
  tft.print("SIGUIENTE");

  // Wait for the "SIGUIENTE" button to be pressed
  while (digitalRead(NEXT_BUTTON_PIN) == HIGH) {
    delay(50);
  }

  // Step 2
  tft.fillScreen(ILI9341_BLACK);
  tft.setCursor(50, 40);
  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(2);
  tft.print("PASO 2");

  // Record Potentiometer Values for 25 Seconds
  startTime = millis();
  while (millis() - startTime < 25000) {
    pot1Val = analogRead(pot1);
    pot2Val = analogRead(pot2);
    delay(10);
  }

  // Check if Potentiometer Values are Within Range
  if (pot1Val >= 4500 && pot1Val <= 6500 && pot2Val >= 4500 && pot2Val <= 6500) {
    tft.fillScreen(ILI9341_BLACK);
    tft.setCursor(50, 40);
    tft.setTextColor(ILI9341_WHITE);
    tft.setTextSize(2);
    tft.print("PASO 2 EN CORRECTO ESTADO");
  } else {
    tft.fillScreen(ILI9341_BLACK);
    tft.setCursor(50, 40);
    tft.setTextColor(ILI9341_WHITE);
    tft.setTextSize(2);
    tft.print("PASO 2: EN MAL ESTADO");
  }

  // Resto del código sin cambios...
}