尝试words。

8By8/8By8.ino

@@ -874,6 +874,11 @@ byte cube_step = 1;
 
 bool rain_create_new = false;
 
+String display_string = "";
+int letter_create_layer_count = 0;
+// When count to 7, it's time to draw the new letter.
+int next_char_ptr = 0;
+
 void setup() {
     for (int i = 22; i < 46; i++) {
         pinMode(i, OUTPUT);
@@ -1093,7 +1098,53 @@ void clock() {
 }
 
 void words() {
-    return;
+    if (Serial.available()) {
+        byte input_char = Serial.read();
+        if (input_char >= 'A' && input_char <= 'Z') {
+            display_string.concat(input_char);
+        }
+
+        if (input_char >= 'a' && input_char <= 'z') {
+            display_string.concat(input_char - 'a' + 'A');
+        }
+
+        if (input_char == '?') {
+            Serial.print("Current string: ");
+            Serial.println(display_string);
+        }
+
+        if (input_char == '/') {
+            Serial.println("Cleared input.");
+        }
+    }
+
+    delay(50);
+
+    // Move everything one light forward.
+    for (int i = 0; i < 8; i++) {
+        for (int j = 0; j < 8; j++) {
+            Cube::LED_brightness[i][j] = Cube::LED_brightness[i][j] >> 2;
+            Cube::LED_status[i][j] = Cube::LED_status[i][j] >> 2;
+        }
+    }
+
+    letter_create_layer_count++;
+
+    if (letter_create_layer_count < 7 ) {
+        // The previous have not been moved out
+        return;
+    }
+
+    letter_create_layer_count = 0;
+
+    if (next_char_ptr == display_string.length()) {
+        // Displayed all chars. 'Display' a space and reverse to the first char.
+        next_char_ptr = 0;
+        return;
+    }
+
+    Cube::draw_letter(1, 7, 7, display_string[next_char_ptr] - 'A', 2, 3);
+    next_char_ptr++;
 }
 
 void calculate_and_draw() {