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SCA_DelaySensor(SCA_ISensor)
============================
base class --- :class:`SCA_ISensor`
.. class:: SCA_DelaySensor(SCA_ISensor)
The Delay sensor generates positive and negative triggers at precise time,
expressed in number of frames. The delay parameter defines the length of the initial OFF period. A positive trigger is generated at the end of this period.
The duration parameter defines the length of the ON period following the OFF period.
There is a negative trigger at the end of the ON period. If duration is 0, the sensor stays ON and there is no negative trigger.
The sensor runs the OFF-ON cycle once unless the repeat option is set: the OFF-ON cycle repeats indefinately (or the OFF cycle if duration is 0).
Use :class:`SCA_ISensor.reset` at any time to restart sensor.
.. attribute:: delay
length of the initial OFF period as number of frame, 0 for immediate trigger.
:type: integer.
.. attribute:: duration
length of the ON period in number of frame after the initial OFF period.
If duration is greater than 0, a negative trigger is sent at the end of the ON pulse.
:type: integer
.. attribute:: repeat
1 if the OFF-ON cycle should be repeated indefinately, 0 if it should run once.
:type: integer
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