LCDsimpleCommand.ino

// C++ code for LCD display of A-Z, a-z, and 0-9 characters

const int RS = 13;
const int E = 12;
const int DB4 = 11;
const int DB5 = 10;
const int DB6 = 9;
const int DB7 = 8;

void initlcd();  // Function prototypes
void writeAlpha(char ch);
void sent(int rs, int db4, int db5, int db6, int db7);

void setup() {
  pinMode(RS, OUTPUT);
  pinMode(E, OUTPUT);
  pinMode(DB4, OUTPUT);
  pinMode(DB5, OUTPUT);
  pinMode(DB6, OUTPUT);
  pinMode(DB7, OUTPUT);

  // Initialize the LCD
  initlcd();
}

void loop() {
  // Test by printing a sample string with uppercase, lowercase, and numeric characters
  const char *message = "Hello World 123 ABC xyz";

  for (int i = 0; message[i] != '\0'; i++) {
    writeAlpha(message[i]);
  }

  delay(2000); // Delay before repeating the message
}

void initlcd() {
  // LCD initialization sequence
  sent(0, 0, 1, 0, 0);  // Function set
  sent(0, 0, 0, 0, 0); sent(0, 1, 0, 0, 0); // 4-bit mode
  sent(0, 0, 0, 0, 0); sent(0, 0, 1, 0, 0); // Display on
  sent(0, 0, 0, 0, 0); sent(0, 0, 0, 1, 1); // Clear display
}

void writeAlpha(char ch) {
  switch (ch) {
    // Uppercase letters
    case 'A': sent(1, 0, 0, 1, 0); sent(1, 1, 0, 0, 0); break;
    case 'B': sent(1, 0, 0, 1, 0); sent(1, 0, 1, 0, 0); break;
    case 'C': sent(1, 0, 0, 1, 0); sent(1, 1, 1, 0, 0); break;
    case 'D': sent(1, 0, 0, 1, 1); sent(1, 0, 0, 0, 0); break;
    case 'E': sent(1, 0, 0, 1, 1); sent(1, 0, 1, 0, 0); break;
    case 'F': sent(1, 0, 0, 1, 1); sent(1, 1, 1, 0, 0); break;
    case 'G': sent(1, 0, 1, 0, 0); sent(1, 0, 0, 0, 0); break;
    case 'H': sent(1, 0, 1, 0, 0); sent(1, 0, 1, 0, 0); break;
    case 'I': sent(1, 0, 1, 0, 0); sent(1, 1, 1, 0, 0); break;
    case 'J': sent(1, 0, 1, 0, 1); sent(1, 0, 0, 0, 0); break;
    case 'K': sent(1, 0, 1, 0, 1); sent(1, 0, 1, 0, 0); break;
    case 'L': sent(1, 0, 1, 0, 1); sent(1, 1, 1, 0, 0); break;
    case 'M': sent(1, 0, 1, 1, 0); sent(1, 0, 0, 0, 0); break;
    case 'N': sent(1, 0, 1, 1, 0); sent(1, 0, 1, 0, 0); break;
    case 'O': sent(1, 0, 1, 1, 0); sent(1, 1, 1, 0, 0); break;
    case 'P': sent(1, 0, 1, 1, 1); sent(1, 0, 0, 0, 0); break;
    case 'Q': sent(1, 0, 1, 1, 1); sent(1, 0, 1, 0, 0); break;
    case 'R': sent(1, 0, 1, 1, 1); sent(1, 1, 1, 0, 0); break;
    case 'S': sent(1, 1, 0, 0, 0); sent(1, 0, 0, 0, 0); break;
    case 'T': sent(1, 1, 0, 0, 0); sent(1, 0, 1, 0, 0); break;
    case 'U': sent(1, 1, 0, 0, 1); sent(1, 0, 0, 0, 0); break;
    case 'V': sent(1, 1, 0, 0, 1); sent(1, 0, 1, 0, 0); break;
    case 'W': sent(1, 1, 0, 1, 0); sent(1, 0, 0, 0, 0); break;
    case 'X': sent(1, 1, 0, 1, 0); sent(1, 0, 1, 0, 0); break;
    case 'Y': sent(1, 1, 0, 1, 1); sent(1, 0, 0, 0, 0); break;
    case 'Z': sent(1, 1, 0, 1, 1); sent(1, 0, 1, 0, 0); break;

    // Lowercase letters
    case 'a': sent(1, 0, 1, 1, 0); sent(1, 1, 0, 0, 1); break;
    case 'b': sent(1, 0, 1, 1, 0); sent(1, 0, 1, 0, 0); break;
    case 'c': sent(1, 0, 1, 1, 0); sent(1, 1, 1, 0, 0); break;
    case 'd': sent(1, 0, 1, 1, 1); sent(1, 0, 0, 0, 0); break;
    case 'e': sent(1, 0, 1, 1, 1); sent(1, 0, 1, 0, 0); break;
    case 'f': sent(1, 0, 1, 1, 1); sent(1, 1, 1, 0, 0); break;
    case 'g': sent(1, 1, 0, 0, 0); sent(1, 0, 0, 0, 1); break;
    case 'h': sent(1, 1, 0, 0, 0); sent(1, 0, 1, 0, 0); break;
    case 'i': sent(1, 1, 0, 0, 0); sent(1, 1, 1, 0, 0); break;
    case 'j': sent(1, 1, 0, 0, 1); sent(1, 0, 0, 0, 1); break;
    case 'k': sent(1, 1, 0, 0, 1); sent(1, 0, 1, 0, 0); break;
    case 'l': sent(1, 1, 0, 0, 1); sent(1, 1, 1, 0, 0); break;
    case 'm': sent(1, 1, 0, 1, 0); sent(1, 0, 0, 0, 1); break;
    case 'n': sent(1, 1, 0, 1, 0); sent(1, 0, 1, 0, 0); break;
    case 'o': sent(1, 1, 0, 1, 0); sent(1, 1, 1, 0, 0); break;
    case 'p': sent(1, 1, 0, 1, 1); sent(1, 0, 0, 0, 1); break;
    case 'q': sent(1, 1, 0, 1, 1); sent(1, 0, 1, 0, 0); break;
    case 'r': sent(1, 1, 0, 1, 1); sent(1, 1, 1, 0, 0); break;
    case 's': sent(1, 1, 1, 0, 0); sent(1, 0, 0, 0, 1); break;
    case 't': sent(1, 1, 1, 0, 0); sent(1, 0, 1, 0, 0); break;
    case 'u': sent(1, 1, 1, 0, 1); sent(1, 0, 0, 0, 1); break;
    case 'v': sent(1, 1, 1, 0, 1); sent(1, 0, 1, 0, 0); break;
    case 'w': sent(1, 1, 1, 1, 0); sent(1, 0, 0, 0, 1); break;
    case 'x': sent(1, 1, 1, 1, 0); sent(1, 0, 1, 0, 0); break;
    case 'y': sent(1, 1, 1, 1, 1); sent(1, 0, 0, 0, 1); break;
    case 'z': sent(1, 1, 1, 1, 1); sent(1, 0, 1, 0, 0); break;

    // Numbers
    case '0': sent(1, 0, 1, 1, 1); sent(1, 0, 0, 0, 0); break;
    case '1': sent(1, 0, 1, 1, 1); sent(1, 0, 0, 0, 1); break;
    case '2': sent(1, 0, 1, 1, 1); sent(1, 0, 0, 1, 0); break;
    case '3': sent(1, 0, 1, 1, 1); sent(1, 0, 0, 1, 1); break;
    case '4': sent(1, 0, 1, 1, 1); sent(1, 0, 1, 0, 0); break;
    case '5': sent(1, 0, 1, 1, 1); sent(1, 0, 1, 0, 1); break;
    case '6': sent(1, 0, 1, 1, 1); sent(1, 0, 1, 1, 0); break;
    case '7': sent(1, 0, 1, 1, 1); sent(1, 0, 1, 1, 1); break;
    case '8': sent(1, 0, 1, 1, 1); sent(1, 1, 0, 0, 0); break;
    case '9': sent(1, 0, 1, 1, 1); sent(1, 1, 0, 0, 1); break;

    // Space
    case ' ': sent(1, 0, 1, 0, 0); sent(1, 0, 0, 0, 0); break;

    // Default case to handle unknown characters
    default: sent(1, 0, 1, 0, 0); sent(1, 0, 0, 0, 0); break; // Space
  }
}

void sent(int rs, int db4, int db5, int db6, int db7) {
  // Set RS pin (1 for data, 0 for command)
  digitalWrite(RS, rs);

  // Set data pins to send 4-bit data
  digitalWrite(DB4, db4);
  digitalWrite(DB5, db5);
  digitalWrite(DB6, db6);
  digitalWrite(DB7, db7);

  // Pulse the enable pin
  digitalWrite(E, LOW);
  delayMicroseconds(1);
  digitalWrite(E, HIGH);
  delayMicroseconds(1);
  digitalWrite(E, LOW);

  delay(10); // Small delay to let LCD process
}