Saturday, January 28, 2012

Scrolling message sign display with Wise Clock 3/4 - part 2

This post, written some time ago, demonstrated how to make a message sign using two 3216 displays connected to Wise Clock 3. The font used in the demo is 8*8 (actually just 7*7), quite small for the 16 LED height of the display.

The code for a larger (11x14) font is already included in the Wise Clock 3/4 software (file fontLarge.h), just not used and used when the "Big Font" menu option is selected (file AppBig.cpp). I resurrected this forgotten font and the functions that use it and this is how it works:

I modified the original sketch (posted in this thread of the Arduino forum) to include the following lines at the top of the file:

char* msgLine = "           Hello world - demo for large font scrolling on dual 3216 display.";
int crtPos = 0;
int crtColor = GREEN;

and the loop() function:

void loop ()

  if (crtPos >= strlen(msgLine))
      crtPos = 0;

The source code for the demo in the video can be found here.

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