/ 
Device-CurrentCost-1.112970
River stage one • 1 direct dependent • 1 total dependent
/ Device::CurrentCost

NAME

Device::CurrentCost - Perl modules for Current Cost energy monitors

VERSION

version 1.112970

SYNOPSIS

use Device::CurrentCost;
my $envy = Device::CurrentCost->new(device => '/dev/ttyUSB0');

$|=1; # don't buffer output

while (1) {
  my $msg = $envy->read() or next;
  print $msg->summary, "\n";
}

use Device::CurrentCost::Constants;
my $classic = Device::CurrentCost->new(device => '/dev/ttyUSB1',
                                       type => CURRENT_COST_CLASSIC);
# ...

open my $cclog, '<', 'currentcost.log' or die $!;
my $cc = Device::CurrentCost->new(filehandle => $cclog);

while (1) {
  my $msg = $cc->read() or next;
  print $msg->summary, "\n";
}

DESCRIPTION

Module for reading from Current Cost energy meters.

IMPORTANT: This is an early release and the API is still subject to change.

The API for history is definitely not complete. This will change soon and an mechanism for aggregating the history (which is split across many messages) should be added.

METHODS

new(%parameters)

This constructor returns a new Current Cost device object. The supported parameters are:

device

The name of the device to connect to. The value should be a tty device name, e.g. /dev/ttyUSB0 but a pipe or plain file should also work. This parameter is mandatory if filehandle is not given.

filehandle

A filehandle to read from. This parameter is mandatory if device is not given.

type

The type of the device. Currently either CURRENT_COST_CLASSIC or CURRENT_COST_ENVY. The default is CURRENT_COST_ENVY.

baud

The baud rate for the device. The default is derived from the type and is either 57600 (for Envy) or 9600 (for classic).

history_callback

A function, taking a sensor id, a time interval and a hash reference of data as arguments, to be called every time a new complete set of history data becomes available. The data hash reference has keys of the number of intervals ago and values of the reading at that time.

device()

Returns the path to the device.

type()

Returns the type of the device.

baud()

Returns the baud rate.

posix_baud()

Returns the baud rate in POSIX::Termios format.

filehandle()

Returns the filehandle being used to read from the device.

open()

This method opens the serial port and configures it.

read($timeout)

This method blocks until a new message has been received by the device. When a message is received a data structure is returned that represents the data received.

IMPORTANT: This API is still subject to change.

read_one(\$buffer)

This method attempts to remove a single Current Cost message from the buffer passed in via the scalar reference. When a message is removed a data structure is returned that represents the data received. If insufficient data is available then undef is returned.

IMPORTANT: This API is still subject to change.

sensor_history($sensor, $interval)

This method returns the most recent complete sensor data for the given sensor and the given interval (where interval must be one of 'hours', 'days', 'months' or 'years'). The return value is a hash reference with keys for 'time' and 'data'. The 'time' value is the time (in seconds since epoch). The 'data' value is a hash reference with keys of the number of intervals ago and values of the reading at that time.

It returns undef if no history data has been received yet.

AUTHOR

Mark Hindess <soft-cpan@temporalanomaly.com>

COPYRIGHT AND LICENSE

This software is copyright (c) 2011 by Mark Hindess.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.