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    Returns a RPi::LCD object, which allows you to fully manipulate LCD
    displays connected to your Raspberry Pi.

    Please see the linked documentation for information regarding the
    parameters required.

 pin($pin_num)

    Returns a RPi::Pin object, mapped to a specified GPIO pin, which you
    can then perform operations on. See that documentation for full usage
    details.

    Parameters:

        $pin_num

    Mandatory, Integer: The pin number to attach to.

 rtc

    Creates a new RPi::RTC::DS3231 object which provides access to the
    DS3231 or DS1307 real-time clock modules.

    See the linked documentation for full documentation on usage, or the
    RPi::WiringPi::FAQ for some usage examples.

    Parameters:

        $i2c_addr

    Optional, Integer: The I2C address of the RTC module. Defaults to 0x68
    for the DS3231 unit.

 expander

    Creates a new RPi::GPIOExpander::MCP23017 GPIO expander chip object.
    This adds an additional 16 pins across two banks (8 pins per bank).

    See the linked documentation for full documentation on usage, or the
    RPi::WiringPi::FAQ for some usage examples.

    Parameters:

        $i2c_addr

    Optional, Integer: The I2C address of the device. Defaults to 0x20.

        $expander

    Optional, String: The GPIO expander device type. Defaults to MCP23017,
    and currently, this is the only option available.

 serial($device, $baud)

    Creates a new RPi::Serial object which allows basic read/write access
    to a serial bus.

    See the linked documentation for full documentation on usage, or the
    RPi::WiringPi::FAQ for usage examples.

    NOTE: Bluetooth on the Pi overlays the serial pins (14, 15) on the Pi.
    To use serial, you must disable bluetooth in the /boot/config.txt file:

        dtoverlay=pi3-disable-bt-overlay

 servo($pin_num)

    This method configures PWM clock and divisor to operate a typical 50Hz
    servo, and returns a special RPi::Pin object. These servos have a left
    pulse of 50, a centre pulse of 150 and a right pulse of 250. On exit of
    the program (or a crash), we automatically clean everything up
    properly.

    Parameters:

        $pin_num

    Mandatory, Integer: The pin number (technically, this *must* be 18 on
    the Raspberry Pi 3, as that's the only hardware PWM pin.

        %pwm_config

    Optional, Hash. This parameter should only be used if you know what
    you're doing and are having very specific issues.

    Keys are clock with a value that coincides with the PWM clock speed. It
    defaults to 192. The other key is range, the value being an integer
    that sets the range of the PWM. Defaults to 2000.

    Example:

        my $servo = $pi->servo(18);
    
        $servo->pwm(50);  # all the way left
        $servo->pwm(250); # all the way right

 shift_register($base, $num_pins, $data, $clk, $latch)

    Allows you to access the output pins of up to four 74HC595 shift
    registers in series, for a total of eight new output pins per register.
    Numerous chains of four registers are permitted, each chain uses three
    GPIO pins.

    Parameters:

        $base

    Mandatory: Integer, represents the number at which you want to start
    referencing the new output pins attached to the register(s). For
    example, if you use 100 here, output pin 0 of the register will be 100,
    output 1 will be 101 etc.

        $num_pins

    Mandatory: Integer, the number of output pins on the registers you want
    to use. Each register has eight outputs, so if you have a single
    register in use, the maximum number of additional pins would be eight.

        $data

    Mandatory: Integer, the GPIO pin number attached to the DS pin (14) on
    the shift register.

        $clk