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Generic docs need reST

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Conversion of all docs to reST so that the generic docs can link easily
with the rest of the docs.
This commit is contained in:
Dave Jones
2015-10-27 21:08:36 +00:00
parent bcb8758dcf
commit 0bc62aee73
44 changed files with 5315 additions and 2010 deletions
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207
gpiozero/output_devices.py
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@@ -20,14 +20,18 @@ class OutputDevice(SourceMixin, GPIODevice):
"""
Represents a generic GPIO output device.
This class extends `GPIODevice` to add facilities common to GPIO output
devices: an `on` method to switch the device on, and a corresponding `off`
method.
This class extends :class:`GPIODevice` to add facilities common to GPIO
output devices: an :meth:`on` method to switch the device on, and a
corresponding :meth:`off` method.
active_high: `True`
If `True` (the default), the `on` method will set the GPIO to HIGH. If
`False`, the `on` method will set the GPIO to LOW (the `off` method
always does the opposite).
:param int pin:
The GPIO pin (in BCM numbering) that the device is connected to. If
this is ``None`` a :exc:`GPIODeviceError` will be raised.
:param bool active_high:
If ``True`` (the default), the :meth:`on` method will set the GPIO to
HIGH. If ``False``, the :meth:`on` method will set the GPIO to LOW (the
:meth:`off` method always does the opposite).
"""
def __init__(self, pin=None, active_high=True):
self._active_high = active_high
@@ -94,10 +98,10 @@ class DigitalOutputDevice(OutputDevice):
"""
Represents a generic output device with typical on/off behaviour.
This class extends `OutputDevice` with a `toggle` method to switch the
device between its on and off states, and a `blink` method which uses an
optional background thread to handle toggling the device state without
further interaction.
This class extends :class:`OutputDevice` with a :meth:`toggle` method to
switch the device between its on and off states, and a :meth:`blink` method
which uses an optional background thread to handle toggling the device
state without further interaction.
"""
def __init__(self, pin=None, active_high=True):
self._blink_thread = None
@@ -109,16 +113,10 @@ class DigitalOutputDevice(OutputDevice):
super(DigitalOutputDevice, self).close()
def on(self):
"""
Turns the device on.
"""
self._stop_blink()
self._write(self._active_state)
def off(self):
"""
Turns the device off.
"""
self._stop_blink()
self._write(self._inactive_state)
@@ -137,19 +135,19 @@ class DigitalOutputDevice(OutputDevice):
"""
Make the device turn on and off repeatedly.
on_time: `1`
:param float on_time:
Number of seconds on
off_time: `1`
:param float off_time:
Number of seconds off
n: `None`
Number of times to blink; `None` means forever
:param int n:
Number of times to blink; ``None`` means forever
background: `True`
If `True`, start a background thread to continue blinking and
return immediately. If `False`, only return when the blink is
finished (warning: the default value of n will result in this
:param bool background:
If ``True``, start a background thread to continue blinking and
return immediately. If ``False``, only return when the blink is
finished (warning: the default value of *n* will result in this
method never returning).
"""
self._stop_blink()
@@ -179,11 +177,28 @@ class DigitalOutputDevice(OutputDevice):
class LED(DigitalOutputDevice):
"""
An LED (Light Emmitting Diode) component.
Extends :class:`DigitalOutputDevice` and represents a light emitting diode
(LED).
A typical configuration of such a device is to connect a GPIO pin to the
anode (long leg) of the LED, and the cathode (short leg) to ground, with
an optional resistor to prevent the LED from burning out.
Connect the cathode (short leg, flat side) of the LED to a ground pin;
connect the anode (longer leg) to a limiting resistor; connect the other
side of the limiting resistor to a GPIO pin (the limiting resistor can be
placed either side of the LED).
The following example will light the LED::
from gpiozero import LED
led = LED(17)
led.on()
:param int pin:
The GPIO pin which the button is attached to. See :doc:`notes` for
valid pin numbers.
:param bool active_high:
If ``True`` (the default), then the LED will be lit when the GPIO port
is high.
"""
pass
@@ -192,10 +207,26 @@ LED.is_lit = LED.is_active
class Buzzer(DigitalOutputDevice):
"""
A digital Buzzer component.
Extends :class:`DigitalOutputDevice` and represents a digital buzzer
component.
A typical configuration of such a device is to connect a GPIO pin to the
anode (long leg) of the buzzer, and the cathode (short leg) to ground.
Connect the cathode (negative pin) of the buzzer to a ground pin; connect
the other side to any GPIO pin.
The following example will sound the buzzer::
from gpiozero import Buzzer
bz = Buzzer(3)
bz.on()
:param int pin:
The GPIO pin which the buzzer is attached to. See :doc:`notes` for
valid pin numbers.
:param bool active_high:
If ``True`` (the default), then the buzzer will sound when the GPIO
port is high.
"""
pass
@@ -204,7 +235,15 @@ Buzzer.beep = Buzzer.blink
class PWMOutputDevice(DigitalOutputDevice):
"""
Generic Output device configured for PWM (Pulse-Width Modulation).
Generic output device configured for pulse-width modulation (PWM).
:param int pin:
The GPIO pin which the device is attached to. See :doc:`notes` for
valid pin numbers.
:param int frequency:
The frequency (in Hz) of pulses emitted to drive the device. Defaults
to 100Hz.
"""
def __init__(self, pin=None, frequency=100):
self._pwm = None
@@ -259,16 +298,17 @@ class PWMOutputDevice(DigitalOutputDevice):
def toggle(self):
"""
Toggle the state of the device. If the device is currently off
(`value` is 0.0), this changes it to "fully" on (`value` is 1.0). If
the device has a duty cycle (`value`) of 0.1, this will toggle it to
0.9, and so on.
(:attr:`value` is 0.0), this changes it to "fully" on (:attr:`value` is
1.0). If the device has a duty cycle (:attr:`value`) of 0.1, this will
toggle it to 0.9, and so on.
"""
self.value = 1.0 - self.value
@property
def is_active(self):
"""
Returns `True` if the device is currently active and `False` otherwise.
Returns ``True`` if the device is currently active (:attr:`value` is
non-zero) and ``False`` otherwise.
"""
return self.value > 0.0
@@ -276,7 +316,7 @@ class PWMOutputDevice(DigitalOutputDevice):
def frequency(self):
"""
The frequency of the pulses used with the PWM device, in Hz. The
default is 100.
default is 100Hz.
"""
return self._frequency
@@ -288,11 +328,20 @@ class PWMOutputDevice(DigitalOutputDevice):
class PWMLED(PWMOutputDevice):
"""
An LED (Light Emmitting Diode) component with variable brightness.
Extends :class:`PWMOutputDevice` and represents a light emitting diode
(LED) with variable brightness.
A typical configuration of such a device is to connect a GPIO pin to the
anode (long leg) of the LED, and the cathode (short leg) to ground, with
an optional resistor to prevent the LED from burning out.
:param int pin:
The GPIO pin which the device is attached to. See :doc:`notes` for
valid pin numbers.
:param int frequency:
The frequency (in Hz) of pulses emitted to drive the device. Defaults
to 100Hz.
"""
pass
@@ -309,22 +358,35 @@ def _led_property(index, doc=None):
class RGBLED(SourceMixin, CompositeDevice):
"""
Single LED with individually controllable red, green and blue components.
Extends :class:`CompositeDevice` and represents a full color LED component
(composed of red, green, and blue LEDs).
red: `None`
Connect the common cathode (longest leg) to a ground pin; connect each of
the other legs (representing the red, green, and blue anodes) to any GPIO
pins. You can either use three limiting resistors (one per anode) or a
single limiting resistor on the cathode.
The following code will make the LED purple::
from gpiozero import RGBLED
led = RGBLED(2, 3, 4)
led.color = (1, 0, 1)
:param int red:
The GPIO pin that controls the red component of the RGB LED.
green: `None`
:param int green:
The GPIO pin that controls the green component of the RGB LED.
blue: `None`
:param int blue:
The GPIO pin that controls the blue component of the RGB LED.
"""
def __init__(self, red=None, green=None, blue=None):
if not all([red, green, blue]):
raise OutputDeviceError('red, green, and blue pins must be provided')
super(RGBLED, self).__init__()
self._leds = tuple(PWMOutputDevice(pin) for pin in (red, green, blue))
self._leds = tuple(PWMLED(pin) for pin in (red, green, blue))
red = _led_property(0)
green = _led_property(1)
@@ -333,11 +395,11 @@ class RGBLED(SourceMixin, CompositeDevice):
@property
def value(self):
"""
Represents the color of the LED as an RGB 3-tuple of `(red, green,
blue)` where each value is between 0 and 1.
Represents the color of the LED as an RGB 3-tuple of ``(red, green,
blue)`` where each value is between 0 and 1.
For example, purple would be `(1, 0, 1)` and yellow would be `(1, 1,
0)`, while orange would be `(1, 0.5, 0)`.
For example, purple would be ``(1, 0, 1)`` and yellow would be ``(1, 1,
0)``, while orange would be ``(1, 0.5, 0)``.
"""
return (self.red, self.green, self.blue)
@@ -348,7 +410,8 @@ class RGBLED(SourceMixin, CompositeDevice):
@property
def is_active(self):
"""
Returns `True` if the LED is currently active and `False` otherwise.
Returns ``True`` if the LED is currently active (not black) and
``False`` otherwise.
"""
return self.value != (0, 0, 0)
@@ -357,14 +420,14 @@ class RGBLED(SourceMixin, CompositeDevice):
def on(self):
"""
Turn the device on. This equivalent to setting the device color to
white `(1, 1, 1)`.
white ``(1, 1, 1)``.
"""
self.value = (1, 1, 1)
def off(self):
"""
Turn the device off. This is equivalent to setting the device color
to black `(0, 0, 0)`.
to black ``(0, 0, 0)``.
"""
self.value = (0, 0, 0)
@@ -375,7 +438,30 @@ class RGBLED(SourceMixin, CompositeDevice):
class Motor(SourceMixin, CompositeDevice):
"""
Generic bi-directional motor.
Extends :class:`CompositeDevice` and represents a generic motor connected
to a bi-directional motor driver circuit (i.e. an `H-bridge`_).
Attach an `H-bridge`_ motor controller to your Pi; connect a power source
(e.g. a battery pack or the 5V pin) to the controller; connect the outputs
of the controller board to the two terminals of the motor; connect the
inputs of the controller board to two GPIO pins.
.. _H-bridge: https://en.wikipedia.org/wiki/H_bridge
The following code will make the motor turn "forwards"::
from gpiozero import Motor
motor = Motor(17, 18)
motor.forward()
:param int forward:
The GPIO pin that the forward input of the motor driver chip is
connected to.
:param int backward:
The GPIO pin that the backward input of the motor driver chip is
connected to.
"""
def __init__(self, forward=None, backward=None):
if not all([forward, backward]):
@@ -432,20 +518,29 @@ class Motor(SourceMixin, CompositeDevice):
@property
def is_active(self):
"""
Returns `True` if the motor is currently active and `False` otherwise.
Returns ``True`` if the motor is currently running and ``False``
otherwise.
"""
return self.value != 0
def forward(self, speed=1):
"""
Drive the motor forwards
Drive the motor forwards.
:param float speed:
The speed at which the motor should turn. Can be any value between
0 (stopped) and the default 1 (maximum speed).
"""
self._backward.off()
self._forward.value = speed
def backward(self, speed=1):
"""
Drive the motor backwards
Drive the motor backwards.
:param float speed:
The speed at which the motor should turn. Can be any value between
0 (stopped) and the default 1 (maximum speed).
"""
self._forward.off()
self._backward.value = speed
@@ -460,7 +555,7 @@ class Motor(SourceMixin, CompositeDevice):
def stop(self):
"""
Stop the motor
Stop the motor.
"""
self._forward.off()
self._backward.off()