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  1. or download this
    use warnings;
use strict;
...
my $v = $adc->volts;
my $p = $adc->percent;
my $r = $adc->raw;
  2. or download this
    # A0, A1 and A3 input channels

for (0, 1, 3){ 
    print $adc->percent($_) ."\n";
}
  3. or download this
    my $diff_a0_a3 = $adc->percent(5);

...

$adc->channel(5);
my $diff_a0_a3 = $adc->percent;