3.1.2 Filtering and Detection Algorithm
Parameters
PIR_WARMUP_TIME
This parameter sets the
PIR warm-up time. This parameter should be adjusted to match the warm-up
time needed for the selected PIR sensor in the application.
PIR_DETECTION_THRESHOLD
This parameter sets the
detection threshold of the application. Decreasing this parameter can
increase the effective range that the system can detect movement on, but
at the same time increase the chance of false detections due to sudden
changes in ambient temperatures or other disturbances. Increasing this
parameter decreases the range, but the likelihood of false detections
will be lower. Setting this parameter too high can result in no
detections.
PIR_LONG_TERM_FILTER_RANGE
This parameter sets the
length of the long term filter. Changes to this parameter need to be
done carefully while also considering the PIR_SHORT_TERM_FILTER_RANGE
and PIR_DETECTION_THRESHOLD parameters. Changes can affect the effective
range of the system and increase power consumption.
PIR_SHORT_TERM_FILTER_RANGE
This parameter sets the
length of the short term filter. Changes to this parameter need to be
done carefully while also considering the PIR_LONG_TERM_FILTER_RANGE and
PIR_DETECTION_THRESHOLD parameters. Changes can affect the effective
range of the system and increase power consumption.
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