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Think about Loose Coupling

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No, you don't, you Stoner :-) But finding out wether a time in between a given interval or not is easy. Doing it this way saves you from having to deal with fixed switch times, which are, as you wrote, unreliable in case of outages or just the computer being shut down at the wrong moment.
use 5.24.1; use feature qw:signatures:; no warnings qw:experimental:; my @off_from = (22, 0, 0); #22:00:00 my @off_until = (08, 0, 1); #08:00:00 sub cmpt ( $a, $b ) { for ( 0 .. 2 ){ return $a->[$_] <=> $b->[$_] if $a->[$_] != $b->[$_] ; } return 0; } sub is_nighttime( $now ) { my @now = @{$now} || (localtime(time))[2,1,0]; if ( cmpt( \@off_from, \@off_until ) == 1 ) { # over midnight return cmpt(\@now, \@off_from) == 1 || cmpt( \@now, \@off_unti +l ) == -1; } else { # all same day return cmpt(\@now, \@off_from) == 1 && cmpt( \@now, \@off_unti +l ) == -1; } return 0; }
Edit: Removed C&P remnant
Edit: added code
Edit: added <=> (it's been a while)


You can lead your users to water, but alas, you cannot drown them.

In reply to Re^3: Efficiency of indoor grow light timer by holli
in thread Efficiency of indoor grow light timer by stevieb

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