NAME

    App::RPi::EnvUI - One-page asynchronous grow room environment control
    web application

SYNOPSIS

        cd ~/envui
        sudo plackup bin/app.pl

    Now direct your browser at your Pi, on port 3000:

        http://raspberry.pi:3000

DESCRIPTION

    A self-contained web application that runs on a Raspberry Pi and
    monitors and manages an indoor grow room environment, with an API that
    can be used external to the web app itself.

    ***NOTE*** This distribution is still in heavy development. It will
    unit test on any *nix PC, but at this time, it will only run correctly
    on a Raspberry Pi with wiringPi <http://wiringpi.com> installed. We
    also require sudo to run the webapp, due to limitations in other
    software I rely upon, but I've got fixes in the works to eliminate the
    sudo requirement.

    This distribution reads environmental sensors, turns on/off devices
    based on specific thresholds, contains an adjustable grow light timer,
    as well as feeding timers.

    The software connects to Raspberry Pi GPIO pins for each "auxillary",
    and at specific times or thresholds, turns on and or off the 120/240v
    devices that you've relayed to that voltage (if you choose to use this
    functionality).

    Whether or not you connect/use the automation functionality, the web UI
    is a one-page app that relies on jQuery/Javascript to pull updates from
    the server, push changes to the server, and display up-to-date live
    information relating to all functionality.

    Buttons are present to manually override devices (turn on/off) outside
    of their schedule or whether they've hit thresholds or not. Devices
    that have been overridden through the web UI will not be triggered by
    automation until the override is lifted.

    The current temperature and humidity is prominently displayed as are
    all of the other features/statistics.

    This is pretty much a singleton application, meaning that all web
    browsers open to the app's UI page will render updates at the same
    time, regardless if another browser or the automation makes any
    changes.

WHAT IT DOES

    Reads temperature and humidity data via a hygrometer sensor through the
    RPi::DHT11 distribution.

    It then allows, through a one-page asynchronous web UI to turn on and
    off 120/240v devices through buttons, timers and reached threshold
    limits.

    For example. We have a max temperature limit of 80F. We assign an
    auxillary (GPIO pin) that is connected to a relay to a 120v exhaust
    fan. Through the configuration file, we load the temp limit, and if the
    temp goes above it, we enable the fan via the GPIO pin.

    To prevent the fan from going on/off repeatedly if the temp hovers at
    the limit, a minimum "on time" is also set, so by default, if the fan
    turns on, it'll stay on for 30 minutes, no matter if the temp drops
    back below the limit.

    Each auxillary has a manual override switch in the UI, and if
    overridden in the UI, it'll remain in the state you set.

    We also include a grow light scheduler, so that you can connect your
    light, set the schedule, and we'll manage it. The light has an override
    switch in the UI, but that can be disabled to prevent any accidents.

    ...manages auto-feeding too, but that's not any where near complete
    yet.

HOW IT WORKS

    Upon installation of this module, a new directory envui will be created
    in your home directory. All of the necessary pieces of code required
    for this web app to run are copied into that directory. You simply
    change into that directory, and run sudo plackup bin/app.pl, then point
    your browser to http://raspberry.pi:3000.

ROUTES

 /

    Use: Browser

    Returns the pre-populated template to the UI. Once the browser loads
    it, it does not have to be reloaded again.

    Return: Template::Toolkit template in HTML

 /light

    Use: Internal

    Returns a JSON string containing the configuration for the light
    section of the page.

    Return: JSON

 /water

    Use: Internal

    Returns a JSON string containing the configuration for the water
    (feeding) section of the page.

    Return: JSON

 /get_config/:want

    Use: Internal

    Fetches and returns a value from the core section of a configuration
    file.

    Parameters:

        :want

    The core configuration directive to retrieve the value for.

    Return: String. The value for the specified directive.

 /get_control/:want

    Use: Internal

    Fetches and returns a value from the control section of a configuration
    file.

    Parameters:

        :want

    The control configuration directive to retrieve the value for.

    Return: String. The value for the specified directive.

 /get_aux/:aux

    Use: Internal

    Fetches an auxillary channel's information, and on the way through,
    makes an App::RPi::EnvUI::API switch() call, which turns on/off the
    auxillary channel if necessary.

    Parameters:

        :aux

    Mandatory, String. The string name of the auxillary channel to fetch
    (eg: aux1).

    Return: JSON. The JSON stringified version of an auxillary channel
    hashref.

 /fetch_env

    Use: Internal

    Fetches the most recent enviromnent details from the database
    (temperature and humidity). Takes no parameters.

    Return: JSON. A JSON string in the form {"temp": "Int", "humidity":
    "Int"}

 /set_aux/:aux/:state

    Use: Internal

    Sets the state of an auxillary channel, when an on-change event occurs
    to a button that is associated with an auxillary.

    Parameters:

        :aux

    Mandatory: String. The string name of the auxillary channel to change
    state on (eg: aux1).

        :state

    Mandatory: Bool. The state of the auxillary after the button change.

    Return: JSON. Returns the current state of the auxillary in the format
    {"aux": "aux_name", "state": "bool"}>.

AUTHOR

    Steve Bertrand, <steveb@cpan.org<gt>

LICENSE AND COPYRIGHT

    Copyright 2016 Steve Bertrand.

    This program is free software; you can redistribute it and/or modify it
    under the terms of either: the GNU General Public License as published
    by the Free Software Foundation; or the Artistic License.

    See http://dev.perl.org/licenses/ for more information.