I've got an update. Today I got a set of little patch cables in the mail and hooked up an old single-digit LED display to seven of the GPIO ports. I then added these subroutines to my library: 
sub bar
{
   my @bar = @_;
   for my $pin (@pins)
   {
      Device::BCM2835::gpio_write( $pin, 0 );
   }
   Device::BCM2835::delay( 40 );
   for my $pin (@pins)
   {
      my $val = shift @bar;
      Device::BCM2835::gpio_write( $pin, 1 ) if $val == 1;
   }
   Device::BCM2835::delay( 240 );
}

sub bilanidin
{
   while ($_ = lc shift)
   {
      print "$_\n";
      bar( qw/1 0 1 0 1 0 1 1/ ) if /a/;
      bar( qw/0 0 0 0 0 1 0 1/ ) if /b/;
      bar( qw/1 0 1 1 0 1 1 1/ ) if /ch/;
      bar( qw/1 0 0 0 1 1 0 0/ ) if /d/;
      bar( qw/1 0 0 1 0 1 1 0/ ) if /e/;
      bar( qw/1 0 0 0 1 0 0 1/ ) if /g/;
      bar( qw/0 0 0 1 0 1 1 0/ ) if /[ijy]/;
      bar( qw/1 0 0 1 1 0 1 0/ ) if /[kq]/;
      bar( qw/0 0 1 1 1 1 0 0/ ) if /l/;
      bar( qw/0 0 1 1 0 0 1/   ) if /m/;
      bar( qw/0 0 1 1 1 0 0 1/ ) if /n/;
      bar( qw/1 0 0 0 1 1 1 1/ ) if /o/;
      bar( qw/0 0 1 1 0 1 1 0/ ) if /p/;
      bar( qw/0 0 1 0 0 0 1 1/ ) if /r/;
      bar( qw/0 0 1 1 1 0 1 0/ ) if /s/;
      bar( qw/0 0 1 0 1 0 1 1/ ) if /t/;
      bar( qw/0 0 1 0 0 0 1 0/ ) if /[huvw]/;
      bar( qw/1 0 1 1 1 0 1 0/ ) if /x/;
      bar( qw/0 0 0 1 0 0 1 1/ ) if /z/;
   }
   Device::BCM2835::delay( 400 );
   bar( qw/0 0 0 0 0 0 0 0/ );
}

[download]
"Bilanidin" is a font designed by Marc Miller for the Traveller pencil-and-paper RPG. I adapted it to the display as closely as I could.

Now my little server can talk to me in bilanidin letters as well as Morse code. This is a lot of fun.

In reply to Re: LED blinking Morse code from Raspberry Pi by rje
in thread LED blinking Morse code from Raspberry Pi by rje

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