LEDDisplay

Arduino library for rotating LED display.

The LED Display board is a simple Arduino clone with a ATMega328p processor, 32768Hz RTC crystal, 16 LEDs and a reed switch.

Fonts are included from the Adafruit GFX library, which can be installed via Arduino library manager.

Installation

Download the zip-File and add the library to your arduino IDE.
Install the Adafruit GFX Library using the library manager.

Getting started

Connect the board to your PC with a FTDI adapter. Choose "Arduino Pro or Pro Mini" as Board and "ATMEGA328P (3.3V,8MHz)" as processor.

Usage

A typical example sketch for having a text running over the display looks like this:

#include <LEDDisplay.h>

//Define a font
GFXfont* gfxFont = &FreeMonoBoldOblique9pt7b;

//Create Instance of LEDDisplay
LEDDisplay led;

//Set shift wait
int shift_wait = 70; //70ms for next shift

//The text to display. Text is put in PROGMEM (not in RAM).
//This allows us to have really big text strings ~ 24kb
const char text[] PROGMEM = "Fablab Bayreuth -- Arduino Day 2018 - 07.04.2018 -- ab 13:00";

void setup(void) {
  led.begin(); //initialize display (e.g. attach INT0)
  led.setFont(gfxFont); //set font pointer
}

void loop(void) {
  if (led.int0_flag) {
    if (led.wokeupFromSleep()) {
      led.clear(); //clear the display
      led.initRunning(shift_wait); //set shift_wait and set offset to zero
    }
    led.setSpeed();//calculates the speed to flash the LEDs
    led.runningTextPROGMEM(text);//add new char to the buffer if shift time is exceeded
    led.run(); //flashes the LEDs and clears int0_flag at the end
  }
  led.sleep(); //go to sleep when there is no int0 for more than 500ms
}

fablab-bayreuth/LEDDisplay

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