KevinMidboe/python-gpiozero
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Fix #143

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Add active_high parameter to PWMOutputDevice (there's no reason PWM
devices can't be wired active low after all)
This commit is contained in:
Dave Jones
2016-01-31 14:58:01 +00:00
parent 741a9b48ed
commit de5dff3c1d
1 changed files with 14 additions and 6 deletions
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20
gpiozero/output_devices.py
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@@ -245,10 +245,10 @@ class PWMOutputDevice(OutputDevice):
The frequency (in Hz) of pulses emitted to drive the device. Defaults
to 100Hz.
"""
def __init__(self, pin=None, frequency=100):
def __init__(self, pin=None, active_high=True, frequency=100):
self._pwm = None
self._blink_thread = None
super(PWMOutputDevice, self).__init__(pin)
super(PWMOutputDevice, self).__init__(pin, active_high)
try:
self._pwm = GPIO.PWM(self.pin, frequency)
self._pwm.start(0.0)
@@ -289,12 +289,18 @@ class PWMOutputDevice(OutputDevice):
The duty cycle of the PWM device. 0.0 is off, 1.0 is fully on. Values
in between may be specified for varying levels of power in the device.
"""
return self._read()
if self.active_high:
return self._read()
else:
return 1 - self._read()
@value.setter
def value(self, value):
self._stop_blink()
self._write(value)
if self._active_high:
self._write(value)
else:
self._write(1 - value)
def on(self):
self._stop_blink()
@@ -392,6 +398,8 @@ class PWMOutputDevice(OutputDevice):
for i in range(int(50 * fade_out_time))
]
sequence.append((0.0, off_time))
if not self.active_high:
sequence = [(1 - value, delay) for (value, delay) in sequence]
sequence = (
cycle(sequence) if n is None else
chain.from_iterable(repeat(sequence, n))
@@ -458,11 +466,11 @@ class RGBLED(SourceMixin, CompositeDevice):
:param int blue:
The GPIO pin that controls the blue component of the RGB LED.
"""
def __init__(self, red=None, green=None, blue=None):
def __init__(self, red=None, green=None, blue=None, active_high=True):
if not all([red, green, blue]):
raise OutputDeviceError('red, green, and blue pins must be provided')
super(RGBLED, self).__init__()
self._leds = tuple(PWMLED(pin) for pin in (red, green, blue))
self._leds = tuple(PWMLED(pin, active_high) for pin in (red, green, blue))
red = _led_property(0)
green = _led_property(1)