How much sensor data can be stored on the SecurityProbe?
There are two modes of data storage/graphing on the SecurityProbe: RRD and JavaScript. If JavaScript graphing is used, the device has enough memory to save 8,640 data points for each sensor. This corresponds to 90 days at a frequency of 15 minutes, or 6 days at a frequency of 1 minute. 35,040 data points for each sensor can be stored in the RRD Tools database. If data is recorded every 15 minutes, then there will be enough data to display measurements for up to 1 year. Besides the increased data capacity, RRD is a highly versatile memory storage tool. Graphs can be plotted by the RRD Tool, into the web-based user interface. The individual graph (day, week, month, and year) for each sensor type can be customized, simply by modifying the script template used to generate a particular graph. On our Linux devices, the flash partition for sensor data / graph storage is 32Mbytes. We cannot change this until we start shipping with larger flash. That will probably happen in a month or so – we a
