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

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+// Demo the quad alphanumeric display LED backpack kit
+// Displays a short message and then scrolls through every character
+
+// For use with Gemma or Trinket (Attiny85) 
+
+#include <avr/power.h>
+#include <Wire.h>
+
+
+// Connect + pins to 3-5V
+// Connect GND to ground
+// Connect Data to #0
+// Connect Clock to #2
+
+#include <Adafruit_GFX.h>
+#include "Adafruit_LEDBackpack.h"
+
+char *message = "Hello world!     ";
+
+Adafruit_AlphaNum4 alpha4 = Adafruit_AlphaNum4();
+
+void setup() {
+  // This is the auto-speed doubler line, keep it in, it will
+  // automatically double the speed when 16Mhz is selected!
+  if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
+  
+  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();
+
+  // send a message!
+  for (uint8_t i=0; i<strlen(message)-4; i++) {
+    alpha4.writeDigitAscii(0, message[i]);
+    alpha4.writeDigitAscii(1, message[i+1]);
+    alpha4.writeDigitAscii(2, message[i+2]);
+    alpha4.writeDigitAscii(3, message[i+3]);
+    alpha4.writeDisplay();
+    
+    delay(200);
+  }
+}
+
+void loop() {
+  // 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);
+  }
+}