Wavetronix SmartSensor V User Manual page 73

CHAPTER 7 • DATA COLLECTION
72
Step 1: Configure Data Storage
The Interval (Bin) Size option specifies the interval of time over which traffic variables like
volume, speed, occupancy and classification are aggregated. This type of data is called inter-
val data. The minimum interval allowed is five seconds.
By default, the checkbox next to Memory Overwrite is checked. This means that your study
will run indefinitely and repeatedly overwrite the flash memory onboard storage. This
means that in order to not lose collected data, you must download it to a log on your com-
puter before it is overwritten.
Alternatively, you can uncheck the Memory Overwrite checkbox. In this case, the study will
run only until the sensor's flash memory has been filled with interval data.
Note
Once the flash memory buffer is full, it must be erased before it can be reused. Before
you erase the stored data, you will want to download the data to a log file on your
computer.
The third line under Step 1 displays the Flash Storage Time. This shows the duration of
interval data that a full flash buffer holds, calculated for you as a number of days and hours.
Because of the way flash memory is managed, the Flash Storage Time will vary based on
whether or not you have Memory Overwrite enabled.
Step 2: Configure the Sensor
When you are ready to begin the study, click on the Start button to:
˽ Enable flash storage
˽ Save the selected settings to the sensor
˽ Synchronize the sensor date and time
˽ Erase stored data from both SRAM and flash memory
It will take several seconds before the study actually begins. When the study does begin, the
start time will be displayed in the status bar at the bottom of the screen.
Note
If the start time does not coincide directly with the beginning of an interval, the first
interval in memory will contain a partial aggregation of data.