feat: Add protosign script with send_sign for Vestaboard

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

protosign.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from vestactrl import setup_digits, board_init_uart
+import textwrap
+
+def send_sign(text):
+    """
+    Wraps and sends text to the Vestaboard.
+    """
+    COLS = 22
+    ROWS = 6
+
+    # Wrap text to fit the board's width.
+    lines = textwrap.wrap(text, width=COLS)
+
+    # Truncate if the message is too long for the board's height.
+    if len(lines) > ROWS:
+        lines = lines[:ROWS]
+
+    # The board controller expects spaces to be replaced with `0 for a blank character.
+    board_lines = [line.replace(' ', '`0') for line in lines]
+
+    # setup_digits handles displaying the lines on the board.
+    # It will also vertically center the block of text.
+    setup_digits(board_lines, left_to_right_swap=False, real_hw=True)
+
+
+if __name__ == '__main__':
+    # Initialize communication with the board.
+    board_init_uart()
+    message = "This is a test of the protosign script. This message should wrap across multiple lines and be truncated if it is too long to fit on the display."
+    send_sign(message)