#include <Arduino.h>

// Define the analog input pin for the potentiometer
const int potPin = 35;

// Define the GPIO pins for the 3x3 LED matrix
const int ledPins[3][3] = {
  {4, 2, 15},
  {19, 18, 5},
  {12, 14, 27}
};

// Character patterns for 'A' to 'Z'
const byte charPatterns[26][3] = {
  // A
  { B111, B101, B111 },
  // B
  { B110, B101, B110 },
  // C
  { B111, B100, B111 },
  // D
  { B110, B101, B110 },
  // E
  { B111, B100, B111 },
  // F
  { B111, B100, B100 },
  // G
  { B111, B101, B111 },
  // H
  { B101, B101, B111 },
  // I
  { B010, B010, B010 },
  // J
  { B001, B001, B010 },
  // K
  { B101, B110, B101 },
  // L
  { B100, B100, B111 },
  // M
  { B101, B111, B101 },
  // N
  { B101, B111, B111 },
  // O
  { B111, B111, B111 },
  // P
  { B111, B101, B100 },
  // Q
  { B111, B111, B101 },
  // R
  { B110, B101, B100 },
  // S
  { B011, B100, B110 },
  // T
  { B111, B010, B010 },
  // U
  { B101, B101, B111 },
  // V
  { B101, B101, B010 },
  // W
  { B101, B111, B111 },
  // X
  { B101, B010, B101 },
  // Y
  { B101, B010, B010 },
  // Z
  { B111, B001, B111 }
};

// Function to display a character pattern on the LED matrix
void displayChar(const byte charPattern[]) {
  for (int row = 0; row < 3; row++) {
    for (int col = 0; col < 3; col++) {
      if (charPattern[row] & (1 << col)) {
        digitalWrite(ledPins[row][col], HIGH);
      } else {
        digitalWrite(ledPins[row][col], LOW);
      }
    }
  }
}

void setup() {
  // Initialize LED matrix pins as outputs
  for (int row = 0; row < 3; row++) {
    for (int col = 0; col < 3; col++) {
      pinMode(ledPins[row][col], OUTPUT);
    }
  }

  // Initialize the potentiometer pin as an input
  pinMode(potPin, INPUT);

  Serial.begin(115200);
  Serial.println("Esp32 - Ready !!!");
}

void loop() {
  // Read the potentiometer value
  int potValue = analogRead(potPin);

  // Map the potentiometer value to the range 0-25 (for 'A' to 'Z')
  int letterIndex = map(potValue, 0, 4095, 0, 25);

  // Ensure the letter index is within the valid range
  letterIndex = constrain(letterIndex, 0, 25);

  // Display the character on the LED matrix
  displayChar(charPatterns[letterIndex]);

  // Print the displayed character to the serial monitor
  char charToDisplay = 'A' + letterIndex;
  Serial.print("Displayed Character: ");
  Serial.println(charToDisplay);

  // Delay for some time before updating again (adjust as needed)
  delay(500);
}