mirror of
https://github.com/KevinMidboe/python-gpiozero.git
synced 2025-10-29 17:50:37 +00:00
83fb6ae8b4
Implements support for the HC-SR04 ultrasonic sensor as an input device class named DistanceSensor
83 lines
1.9 KiB
ReStructuredText
83 lines
1.9 KiB
ReStructuredText
==========
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Exceptions
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==========
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.. currentmodule:: gpiozero
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The following exceptions are defined by GPIO Zero. Please note that multiple
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inheritance is heavily used in the exception hierarchy to make testing for
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exceptions easier. For example, to capture any exception generated by GPIO
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Zero's code::
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from gpiozero import *
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led = PWMLED(17)
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try:
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led.value = 2
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except GPIOZeroError:
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print('A GPIO Zero error occurred')
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Since all GPIO Zero's exceptions descend from :exc:`GPIOZeroError`, this will
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work. However, certain specific errors have multiple parents. For example, in
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the case that an out of range value is passed to :attr:`OutputDevice.value` you
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would expect a :exc:`ValueError` to be raised. In fact, a
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:exc:`OutputDeviceBadValue` error will be raised. However, note that this
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descends from both :exc:`GPIOZeroError` (indirectly) and from :exc:`ValueError`
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so you can still do::
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from gpiozero import *
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led = PWMLED(17)
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try:
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led.value = 2
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except ValueError:
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print('Bad value specified')
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.. autoexception:: GPIOZeroError
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.. autoexception:: CompositeDeviceError
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.. autoexception:: GPIODeviceError
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.. autoexception:: GPIODeviceClosed
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.. autoexception:: GPIOPinInUse
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.. autoexception:: GPIOPinMissing
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.. autoexception:: GPIOBadQueueLen
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.. autoexception:: GPIOBadSampleWait
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.. autoexception:: InputDeviceError
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.. autoexception:: OutputDeviceError
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.. autoexception:: OutputDeviceBadValue
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.. autoexception:: PinError
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.. autoexception:: PinFixedFunction
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.. autoexception:: PinInvalidFunction
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.. autoexception:: PinInvalidState
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.. autoexception:: PinInvalidPull
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.. autoexception:: PinInvalidEdges
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.. autoexception:: PinSetInput
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.. autoexception:: PinFixedPull
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.. autoexception:: PinEdgeDetectUnsupported
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.. autoexception:: PinPWMError
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.. autoexception:: PinPWMUnsupported
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.. autoexception:: PinPWMFixedValue
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