Created
February 24, 2013 09:34
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Set random colors on an LED on the RPi GPIO pins. Does not work as well as kiglow.pl because the frequency is too low to actually do PWM.
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| #!/usr/bin/env perl | |
| use 5.014; | |
| use constant STEPS => 50; | |
| our $pins = { | |
| red => 17, | |
| green => 27, | |
| blue => 22, | |
| }; | |
| initpins($pins); | |
| $SIG{'INT'} = sub { | |
| say " exiting..."; | |
| foreach (qw(red green blue)) { | |
| setpin($pins->{$_},0); | |
| }; | |
| uninitpins($pins); | |
| exit; | |
| }; | |
| while (1) { | |
| my $randomcolor = { | |
| red => int(rand(STEPS)), | |
| green => int(rand(STEPS)), | |
| blue => int(rand(STEPS)), | |
| }; | |
| foreach my $i (0..10) { | |
| setColor(color => $randomcolor); | |
| } | |
| } | |
| exit; | |
| sub setColor { | |
| my $args = { | |
| color => { | |
| red => 0, | |
| green => 0, | |
| blue => 0, | |
| }, | |
| @_ | |
| }; | |
| my $color = $args->{color}; | |
| my $i=0; | |
| foreach $i (0 .. STEPS) { | |
| foreach (qw(red green blue)) { | |
| if($color->{$_} == 0) { | |
| setpin($pins->{$_},0); | |
| } elsif ((($i * STEPS) % int((STEPS**2)/$color->{$_})) < STEPS) { | |
| setpin($pins->{$_},1); | |
| } else { | |
| setpin($pins->{$_},0); | |
| } | |
| } | |
| } | |
| } | |
| sub setpin { | |
| open my $pinvalue, '>', '/sys/class/gpio/gpio' . shift . '/value'; | |
| print $pinvalue shift; | |
| close $pinvalue; | |
| } | |
| sub initpins { | |
| my $pins = shift; | |
| foreach my $pin (values(%$pins)) { | |
| open my $export, '>', '/sys/class/gpio/export'; | |
| say $export "$pin"; | |
| close $export; | |
| open my $pindirection, '>', '/sys/class/gpio/gpio' . $pin . '/direction'; | |
| print $pindirection 'out'; | |
| close $pindirection; | |
| } | |
| } | |
| sub uninitpins { | |
| my $pins = shift; | |
| foreach my $pin (values(%$pins)) { | |
| open my $unexport, ">", "/sys/class/gpio/unexport"; | |
| say $unexport "$pin"; | |
| close $unexport; | |
| } | |
| } | |
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