initial

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 one = Adafruit_AlphaNum4();
+Adafruit_AlphaNum4 two = Adafruit_AlphaNum4();
+
+unsigned long ticks;
+
+
+void setup() {
+  Serial.begin(9600);
+
+  one.begin(0x71);  // pass in the address
+  two.begin(0x70);
+
+  one.writeDigitRaw(3, 0x0);
+  one.writeDigitRaw(0, 0xFFFF);
+  one.writeDisplay();
+  delay(200);
+  one.writeDigitRaw(0, 0x0);
+  one.writeDigitRaw(1, 0xFFFF);
+  one.writeDisplay();
+  delay(200);
+  one.writeDigitRaw(1, 0x0);
+  one.writeDigitRaw(2, 0xFFFF);
+  one.writeDisplay();
+  delay(200);
+  one.writeDigitRaw(2, 0x0);
+  one.writeDigitRaw(3, 0xFFFF);
+  one.writeDisplay();
+  delay(200);
+
+  one.clear();
+  one.writeDisplay();
+
+  two.clear();
+  two.writeDisplay();
+
+  one.writeDigitAscii(0, '1');
+  one.writeDigitAscii(1, '2');
+  one.writeDigitAscii(2, '0');
+  one.writeDigitAscii(3, '0');
+  two.writeDigitAscii(0, '0');
+  two.writeDigitAscii(1, '1');
+  two.writeDigitAscii(2, '2');
+  two.writeDigitAscii(3, '3');
+  one.writeDisplay();
+  two.writeDisplay();
+
+    delay(300);
+
+  Serial.println("Start typing to display!");
+}
+
+
+char displaybuffer[4] = {' ', ' ', ' ', ' '};
+
+void loop() {
+
+  ticks = millis();
+
+
+  sprintf(displaybuffer, "%02d", ticks/1000);
+  sprintf(displaybuffer+2, "%02d", ticks-(ticks/1000)*1000);
+
+ Serial.println(displaybuffer);
+ 
+  // set every digit to the buffer
+  two.writeDigitAscii(0, displaybuffer[0]);
+  two.writeDigitAscii(1, displaybuffer[1]);
+  two.writeDigitAscii(2, displaybuffer[2]);
+  two.writeDigitAscii(3, displaybuffer[3]);
+ 
+  // write it out!
+  two.writeDisplay();
+  delay(10);
+}