No POD found for PCF857x.pm. Time to read the source?
PCF857x.pm
To install Device::Chip::PCF8574, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Device::Chip::PCF8574
CPAN shell
perl -MCPAN -e shell install Device::Chip::PCF8574
For more information on module installation, please visit the detailed CPAN module installation guide.