I'm using the 0.56 7-seg backpack on an Feather Huzzah ESP8266. Following the tutorial here I've run into an issue. While the demo code works great and flashes all the segments, when I try to use matrix.print() or matrix.writeDigitNum() I get this error:
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class Adafruit_LEDBackpack' has no member named 'writeDigitNum'
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void loop() {
matrix.print(0000);
matrix.writeDisplay();
delay(100);
}