mirror of
https://github.com/KevinMidboe/python-gpiozero.git
synced 2025-10-29 17:50:37 +00:00
e52ad37200
The prototypes in the docs are rigged to make out the first parameter as mandatory (as it effectively is); however this does mean you've got to remember to update the prototype when you modify it in the code! :)
702 lines
22 KiB
Python
702 lines
22 KiB
Python
from __future__ import (
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unicode_literals,
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print_function,
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absolute_import,
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division,
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)
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import warnings
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from time import sleep
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from threading import Lock
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from itertools import repeat, cycle, chain
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from RPi import GPIO
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from .exc import OutputDeviceError, GPIODeviceError, GPIODeviceClosed
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from .devices import GPIODevice, GPIOThread, CompositeDevice, SourceMixin
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class OutputDevice(SourceMixin, GPIODevice):
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"""
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Represents a generic GPIO output device.
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This class extends :class:`GPIODevice` to add facilities common to GPIO
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output devices: an :meth:`on` method to switch the device on, and a
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corresponding :meth:`off` method.
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:param int pin:
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The GPIO pin (in BCM numbering) that the device is connected to. If
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this is ``None`` a :exc:`GPIODeviceError` will be raised.
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:param bool active_high:
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If ``True`` (the default), the :meth:`on` method will set the GPIO to
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HIGH. If ``False``, the :meth:`on` method will set the GPIO to LOW (the
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:meth:`off` method always does the opposite).
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:param bool initial_value:
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If ``False`` (the default), the device will be off initially. If
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``None``, the device will be left in whatever state the pin is found in
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when configured for output (warning: this can be on). If ``True``, the
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device will be switched on initially.
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"""
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def __init__(self, pin=None, active_high=True, initial_value=False):
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self._active_high = active_high
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super(OutputDevice, self).__init__(pin)
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self._active_state = GPIO.HIGH if active_high else GPIO.LOW
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self._inactive_state = GPIO.LOW if active_high else GPIO.HIGH
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try:
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# NOTE: catch_warnings isn't thread-safe but hopefully no-one's
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# messing around with GPIO init within background threads...
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with warnings.catch_warnings(record=True) as w:
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# This is horrid, but we can't specify initial=None with setup
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if initial_value is None:
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GPIO.setup(pin, GPIO.OUT)
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else:
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GPIO.setup(pin, GPIO.OUT, initial=
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[self._inactive_state, self._active_state][bool(initial_value)])
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GPIO.setup(pin, GPIO.OUT)
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# The only warning we want to squash is a RuntimeWarning that is
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# thrown when setting pins 2 or 3. Anything else should be replayed
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for warning in w:
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if warning.category != RuntimeWarning or pin not in (2, 3):
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warnings.showwarning(
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warning.message, warning.category, warning.filename,
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warning.lineno, warning.file, warning.line
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)
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except:
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self.close()
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raise
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def _write(self, value):
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if not self.active_high:
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value = not value
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try:
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GPIO.output(self.pin, bool(value))
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except ValueError:
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self._check_open()
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raise
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def on(self):
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"""
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Turns the device on.
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"""
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self._write(True)
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def off(self):
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"""
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Turns the device off.
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"""
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self._write(False)
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@property
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def value(self):
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return super(OutputDevice, self).value
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@value.setter
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def value(self, value):
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self._write(value)
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@property
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def active_high(self):
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return self._active_high
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def __repr__(self):
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try:
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return '<gpiozero.%s object on pin=%d, active_high=%s, is_active=%s>' % (
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self.__class__.__name__, self.pin, self.active_high, self.is_active)
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except:
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return super(OutputDevice, self).__repr__()
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class DigitalOutputDevice(OutputDevice):
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"""
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Represents a generic output device with typical on/off behaviour.
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This class extends :class:`OutputDevice` with a :meth:`toggle` method to
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switch the device between its on and off states, and a :meth:`blink` method
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which uses an optional background thread to handle toggling the device
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state without further interaction.
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"""
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def __init__(self, pin=None, active_high=True, initial_value=False):
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self._blink_thread = None
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super(DigitalOutputDevice, self).__init__(pin, active_high, initial_value)
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self._lock = Lock()
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def close(self):
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self._stop_blink()
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super(DigitalOutputDevice, self).close()
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def on(self):
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self._stop_blink()
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self._write(True)
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def off(self):
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self._stop_blink()
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self._write(False)
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def toggle(self):
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"""
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Reverse the state of the device. If it's on, turn it off; if it's off,
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turn it on.
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"""
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with self._lock:
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if self.is_active:
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self.off()
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else:
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self.on()
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def blink(self, on_time=1, off_time=1, n=None, background=True):
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"""
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Make the device turn on and off repeatedly.
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:param float on_time:
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Number of seconds on. Defaults to 1 second.
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:param float off_time:
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Number of seconds off. Defaults to 1 second.
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:param int n:
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Number of times to blink; ``None`` (the default) means forever.
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:param bool background:
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If ``True`` (the default), start a background thread to continue
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blinking and return immediately. If ``False``, only return when the
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blink is finished (warning: the default value of *n* will result in
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this method never returning).
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"""
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self._stop_blink()
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self._blink_thread = GPIOThread(
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target=self._blink_led, args=(on_time, off_time, n)
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)
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self._blink_thread.start()
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if not background:
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self._blink_thread.join()
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self._blink_thread = None
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def _stop_blink(self):
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if self._blink_thread:
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self._blink_thread.stop()
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self._blink_thread = None
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def _blink_led(self, on_time, off_time, n):
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iterable = repeat(0) if n is None else repeat(0, n)
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for i in iterable:
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self._write(True)
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if self._blink_thread.stopping.wait(on_time):
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break
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self._write(False)
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if self._blink_thread.stopping.wait(off_time):
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break
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class LED(DigitalOutputDevice):
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"""
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Extends :class:`DigitalOutputDevice` and represents a light emitting diode
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(LED).
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Connect the cathode (short leg, flat side) of the LED to a ground pin;
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connect the anode (longer leg) to a limiting resistor; connect the other
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side of the limiting resistor to a GPIO pin (the limiting resistor can be
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placed either side of the LED).
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The following example will light the LED::
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from gpiozero import LED
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led = LED(17)
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led.on()
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:param int pin:
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The GPIO pin which the LED is attached to. See :doc:`notes` for valid
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pin numbers.
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:param bool active_high:
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If ``True`` (the default), the LED will operate normally with the
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circuit described above. If ``False`` you should wire the cathode to
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the GPIO pin, and the anode to a 3V3 pin (via a limiting resistor).
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:param bool initial_value:
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If ``False`` (the default), the LED will be off initially. If
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``None``, the LED will be left in whatever state the pin is found in
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when configured for output (warning: this can be on). If ``True``, the
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LED will be switched on initially.
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"""
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pass
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LED.is_lit = LED.is_active
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class Buzzer(DigitalOutputDevice):
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"""
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Extends :class:`DigitalOutputDevice` and represents a digital buzzer
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component.
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Connect the cathode (negative pin) of the buzzer to a ground pin; connect
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the other side to any GPIO pin.
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The following example will sound the buzzer::
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from gpiozero import Buzzer
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bz = Buzzer(3)
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bz.on()
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:param int pin:
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The GPIO pin which the buzzer is attached to. See :doc:`notes` for
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valid pin numbers.
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:param bool active_high:
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If ``True`` (the default), the buzzer will operate normally with the
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circuit described above. If ``False`` you should wire the cathode to
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the GPIO pin, and the anode to a 3V3 pin.
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:param bool initial_value:
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If ``False`` (the default), the buzzer will be silent initially. If
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``None``, the buzzer will be left in whatever state the pin is found in
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when configured for output (warning: this can be on). If ``True``, the
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buzzer will be switched on initially.
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"""
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pass
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Buzzer.beep = Buzzer.blink
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class PWMOutputDevice(OutputDevice):
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"""
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Generic output device configured for pulse-width modulation (PWM).
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:param int pin:
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The GPIO pin which the device is attached to. See :doc:`notes` for
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valid pin numbers.
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:param bool active_high:
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If ``True`` (the default), the :meth:`on` method will set the GPIO to
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HIGH. If ``False``, the :meth:`on` method will set the GPIO to LOW (the
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:meth:`off` method always does the opposite).
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:param bool initial_value:
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If ``0`` (the default), the device's duty cycle will be 0 initially.
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Other values between 0 and 1 can be specified as an initial duty cycle.
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Note that ``None`` cannot be specified (unlike the parent class) as
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there is no way to tell PWM not to alter the state of the pin.
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:param int frequency:
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The frequency (in Hz) of pulses emitted to drive the device. Defaults
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to 100Hz.
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"""
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def __init__(self, pin=None, active_high=True, initial_value=0, frequency=100):
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self._pwm = None
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self._blink_thread = None
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if not 0 <= initial_value <= 1:
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raise OutputDeviceError("initial_value must be between 0 and 1")
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super(PWMOutputDevice, self).__init__(pin, active_high)
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try:
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self._pwm = GPIO.PWM(self.pin, frequency)
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self._value = initial_value
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if not active_high:
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initial_value = 1 - initial_value
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self._pwm.start(100 * initial_value)
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self._frequency = frequency
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except:
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self.close()
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raise
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def close(self):
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if self._pwm:
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# Ensure we wipe out the PWM object so that re-runs don't attempt
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# to re-stop the PWM thread (otherwise, the fact that close is
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# called from __del__ can easily result in us stopping the PWM
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# on *another* instance on the same pin)
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p = self._pwm
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self._pwm = None
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p.stop()
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super(PWMOutputDevice, self).close()
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def _read(self):
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self._check_open()
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if self.active_high:
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return self._value
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else:
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return 1 - self._value
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def _write(self, value):
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if not self.active_high:
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value = 1 - value
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if not 0 <= value <= 1:
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raise OutputDeviceError("PWM value must be between 0 and 1")
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try:
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self._pwm.ChangeDutyCycle(value * 100)
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except AttributeError:
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self._check_open()
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raise
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self._value = value
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@property
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def value(self):
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"""
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The duty cycle of the PWM device. 0.0 is off, 1.0 is fully on. Values
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in between may be specified for varying levels of power in the device.
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"""
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return self._read()
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@value.setter
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def value(self, value):
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self._stop_blink()
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self._write(value)
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def on(self):
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self._stop_blink()
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self._write(1)
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def off(self):
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self._stop_blink()
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self._write(0)
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def toggle(self):
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"""
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Toggle the state of the device. If the device is currently off
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(:attr:`value` is 0.0), this changes it to "fully" on (:attr:`value` is
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1.0). If the device has a duty cycle (:attr:`value`) of 0.1, this will
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toggle it to 0.9, and so on.
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"""
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self._stop_blink()
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self.value = 1.0 - self.value
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@property
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def is_active(self):
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"""
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Returns ``True`` if the device is currently active (:attr:`value` is
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non-zero) and ``False`` otherwise.
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"""
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return self.value > 0.0
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@property
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def frequency(self):
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"""
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The frequency of the pulses used with the PWM device, in Hz. The
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default is 100Hz.
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"""
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return self._frequency
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@frequency.setter
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def frequency(self, value):
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self._pwm.ChangeFrequency(value)
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self._frequency = value
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def blink(
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self, on_time=1, off_time=1, fade_in_time=0, fade_out_time=0,
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n=None, background=True):
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"""
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Make the device turn on and off repeatedly.
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:param float on_time:
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Number of seconds on. Defaults to 1 second.
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:param float off_time:
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Number of seconds off. Defaults to 1 second.
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:param float fade_in_time:
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Number of seconds to spend fading in. Defaults to 0.
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:param float fade_out_time:
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Number of seconds to spend fading out. Defaults to 0.
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:param int n:
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Number of times to blink; ``None`` (the default) means forever.
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:param bool background:
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If ``True`` (the default), start a background thread to continue
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blinking and return immediately. If ``False``, only return when the
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blink is finished (warning: the default value of *n* will result in
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this method never returning).
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"""
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self._stop_blink()
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self._blink_thread = GPIOThread(
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target=self._blink_led,
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args=(on_time, off_time, fade_in_time, fade_out_time, n)
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)
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self._blink_thread.start()
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if not background:
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self._blink_thread.join()
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self._blink_thread = None
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def _stop_blink(self):
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if self._blink_thread:
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self._blink_thread.stop()
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self._blink_thread = None
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def _blink_led(
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self, on_time, off_time, fade_in_time, fade_out_time, n, fps=50):
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sequence = []
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if fade_in_time > 0:
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sequence += [
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(i * (1 / fps) / fade_in_time, 1 / fps)
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for i in range(int(fps * fade_in_time))
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]
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sequence.append((1, on_time))
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if fade_out_time > 0:
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sequence += [
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(1 - (i * (1 / fps) / fade_out_time), 1 / fps)
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for i in range(int(fps * fade_out_time))
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]
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sequence.append((0, off_time))
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sequence = (
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cycle(sequence) if n is None else
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chain.from_iterable(repeat(sequence, n))
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)
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for value, delay in sequence:
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self._write(value)
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if self._blink_thread.stopping.wait(delay):
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break
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class PWMLED(PWMOutputDevice):
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"""
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Extends :class:`PWMOutputDevice` and represents a light emitting diode
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(LED) with variable brightness.
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A typical configuration of such a device is to connect a GPIO pin to the
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anode (long leg) of the LED, and the cathode (short leg) to ground, with
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an optional resistor to prevent the LED from burning out.
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:param int pin:
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The GPIO pin which the LED is attached to. See :doc:`notes` for
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valid pin numbers.
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:param bool active_high:
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If ``True`` (the default), the :meth:`on` method will set the GPIO to
|
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HIGH. If ``False``, the :meth:`on` method will set the GPIO to LOW (the
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:meth:`off` method always does the opposite).
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:param bool initial_value:
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If ``0`` (the default), the LED will be off initially. Other values
|
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between 0 and 1 can be specified as an initial brightness for the LED.
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Note that ``None`` cannot be specified (unlike the parent class) as
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there is no way to tell PWM not to alter the state of the pin.
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:param int frequency:
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The frequency (in Hz) of pulses emitted to drive the LED. Defaults
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to 100Hz.
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"""
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pass
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PWMLED.is_lit = PWMLED.is_active
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def _led_property(index, doc=None):
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return property(
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lambda self: getattr(self._leds[index], 'value'),
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lambda self, value: setattr(self._leds[index], 'value', value),
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doc
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)
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class RGBLED(SourceMixin, CompositeDevice):
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"""
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Extends :class:`CompositeDevice` and represents a full color LED component
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(composed of red, green, and blue LEDs).
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Connect the common cathode (longest leg) to a ground pin; connect each of
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the other legs (representing the red, green, and blue anodes) to any GPIO
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pins. You can either use three limiting resistors (one per anode) or a
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single limiting resistor on the cathode.
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The following code will make the LED purple::
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from gpiozero import RGBLED
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led = RGBLED(2, 3, 4)
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led.color = (1, 0, 1)
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:param int red:
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The GPIO pin that controls the red component of the RGB LED.
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:param int green:
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The GPIO pin that controls the green component of the RGB LED.
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:param int blue:
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The GPIO pin that controls the blue component of the RGB LED.
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:param bool active_high:
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If ``True`` (the default), the :meth:`on` method will set the GPIOs to
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HIGH. If ``False``, the :meth:`on` method will set the GPIOs to LOW
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(the :meth:`off` method always does the opposite).
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"""
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def __init__(self, red=None, green=None, blue=None, active_high=True):
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if not all([red, green, blue]):
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raise OutputDeviceError('red, green, and blue pins must be provided')
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super(RGBLED, self).__init__()
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self._leds = tuple(PWMLED(pin, active_high) for pin in (red, green, blue))
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|
|
red = _led_property(0)
|
|
green = _led_property(1)
|
|
blue = _led_property(2)
|
|
|
|
@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.
|
|
|
|
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)
|
|
|
|
@value.setter
|
|
def value(self, value):
|
|
self.red, self.green, self.blue = value
|
|
|
|
@property
|
|
def is_active(self):
|
|
"""
|
|
Returns ``True`` if the LED is currently active (not black) and
|
|
``False`` otherwise.
|
|
"""
|
|
return self.value != (0, 0, 0)
|
|
|
|
color = value
|
|
|
|
def on(self):
|
|
"""
|
|
Turn the device on. This equivalent to setting the device color to
|
|
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)``.
|
|
"""
|
|
self.value = (0, 0, 0)
|
|
|
|
def close(self):
|
|
for led in self._leds:
|
|
led.close()
|
|
|
|
|
|
class Motor(SourceMixin, CompositeDevice):
|
|
"""
|
|
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]):
|
|
raise OutputDeviceError(
|
|
'forward and backward pins must be provided'
|
|
)
|
|
super(Motor, self).__init__()
|
|
self._forward = PWMOutputDevice(forward)
|
|
self._backward = PWMOutputDevice(backward)
|
|
|
|
def close(self):
|
|
self._forward.close()
|
|
self._backward.close()
|
|
|
|
@property
|
|
def closed(self):
|
|
return self._forward.closed and self._backward.closed
|
|
|
|
@property
|
|
def forward_device(self):
|
|
"""
|
|
Returns the `PWMOutputDevice` representing the forward pin of the motor
|
|
controller.
|
|
"""
|
|
return self._forward
|
|
|
|
@property
|
|
def backward_device(self):
|
|
"""
|
|
Returns the `PWMOutputDevice` representing the backward pin of the
|
|
motor controller.
|
|
"""
|
|
return self._backward
|
|
|
|
@property
|
|
def value(self):
|
|
"""
|
|
Represents the speed of the motor as a floating point value between -1
|
|
(full speed backward) and 1 (full speed forward).
|
|
"""
|
|
return self._forward.value - self._backward.value
|
|
|
|
@value.setter
|
|
def value(self, value):
|
|
if not -1 <= value <= 1:
|
|
raise OutputDeviceError("Motor value must be between -1 and 1")
|
|
if value > 0:
|
|
self.forward(value)
|
|
elif value < 0:
|
|
self.backward(-value)
|
|
else:
|
|
self.stop()
|
|
|
|
@property
|
|
def is_active(self):
|
|
"""
|
|
Returns ``True`` if the motor is currently running and ``False``
|
|
otherwise.
|
|
"""
|
|
return self.value != 0
|
|
|
|
def forward(self, speed=1):
|
|
"""
|
|
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.
|
|
|
|
: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
|
|
|
|
def reverse(self):
|
|
"""
|
|
Reverse the current direction of the motor. If the motor is currently
|
|
idle this does nothing. Otherwise, the motor's direction will be
|
|
reversed at the current speed.
|
|
"""
|
|
self.value = -self.value
|
|
|
|
def stop(self):
|
|
"""
|
|
Stop the motor.
|
|
"""
|
|
self._forward.off()
|
|
self._backward.off()
|