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#! /usr/bin/perl

...
    $pin->value(0);                    # LED off
    sleep(1);
}

#! /usr/bin/perl
#
...

    sleep(.1);                         # Delay 100ms
}

#! /usr/bin/perl

...
    } 
    return $pin->{pinval}; 
}

#! /usr/bin/perl
# hipipolledencoder.pl - Rotary Encoder Driver for Perl HiPi RPi GPIO 
+Package
...
    }
    $last = $encoded;
}

#! /usr/bin/perl

...

    sleep(3);
}

Installing Quisk SDR Transceiver Software on a Raspberry Pi 3B+
---------------------------------------------------------------
...
uname -a                                (Display Linux Release)
Disks                                   (Linux disk partitioning utili
+ty)
pinout                                  (Displays the RPi Pinout table
+)