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arduino-cli/libraries/Adafruit_LED_Backpack_Library/examples/quadalphanum/quadalphanum.ino

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+// Demo the quad alphanumeric display LED backpack kit
+// scrolls through every character, then scrolls Serial
+// input onto the display
+
+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include "Adafruit_LEDBackpack.h"
+
+Adafruit_AlphaNum4 alpha4 = Adafruit_AlphaNum4();
+
+void setup() {
+  Serial.begin(9600);
+  
+  alpha4.begin(0x70);  // pass in the address
+
+  alpha4.writeDigitRaw(3, 0x0);
+  alpha4.writeDigitRaw(0, 0xFFFF);
+  alpha4.writeDisplay();
+  delay(200);
+  alpha4.writeDigitRaw(0, 0x0);
+  alpha4.writeDigitRaw(1, 0xFFFF);
+  alpha4.writeDisplay();
+  delay(200);
+  alpha4.writeDigitRaw(1, 0x0);
+  alpha4.writeDigitRaw(2, 0xFFFF);
+  alpha4.writeDisplay();
+  delay(200);
+  alpha4.writeDigitRaw(2, 0x0);
+  alpha4.writeDigitRaw(3, 0xFFFF);
+  alpha4.writeDisplay();
+  delay(200);
+  
+  alpha4.clear();
+  alpha4.writeDisplay();
+
+  // display every character, 
+  for (uint8_t i='!'; i<='z'; i++) {
+    alpha4.writeDigitAscii(0, i);
+    alpha4.writeDigitAscii(1, i+1);
+    alpha4.writeDigitAscii(2, i+2);
+    alpha4.writeDigitAscii(3, i+3);
+    alpha4.writeDisplay();
+    
+    delay(300);
+  }
+  Serial.println("Start typing to display!");
+}
+
+
+char displaybuffer[4] = {' ', ' ', ' ', ' '};
+
+void loop() {
+  while (! Serial.available()) return;
+  
+  char c = Serial.read();
+  if (! isprint(c)) return; // only printable!
+  
+  // scroll down display
+  displaybuffer[0] = displaybuffer[1];
+  displaybuffer[1] = displaybuffer[2];
+  displaybuffer[2] = displaybuffer[3];
+  displaybuffer[3] = c;
+ 
+  // set every digit to the buffer
+  alpha4.writeDigitAscii(0, displaybuffer[0]);
+  alpha4.writeDigitAscii(1, displaybuffer[1]);
+  alpha4.writeDigitAscii(2, displaybuffer[2]);
+  alpha4.writeDigitAscii(3, displaybuffer[3]);
+ 
+  // write it out!
+  alpha4.writeDisplay();
+  delay(200);
+}