To amuse myself, I'm trying to learn how to control the 20x4 crystalfontz lcd myself. At the moment I'm using Perl, as it's a quick language. Anyway, I can't for the life of me figure out how to control the backlight... Sample program:
#!/usr/bin/perl
use FileHandle;
open (LCD, ">/dev/ttyS0");
LCD->autoflush();
sleep(3);
print LCD "Hello World";
print LCD "\014\020"; # back light to 20% .. from .pdf
sleep(6);
close (LCD);
exit 0;
Obviously, the syntax that I'm using must not be correct. Does anyone have any suggestions?
#!/usr/bin/perl
use FileHandle;
open (LCD, ">/dev/ttyS0");
LCD->autoflush();
sleep(3);
print LCD "Hello World";
print LCD "\014\020"; # back light to 20% .. from .pdf
sleep(6);
close (LCD);
exit 0;
Obviously, the syntax that I'm using must not be correct. Does anyone have any suggestions?
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