Flot is a JavaScript plotting library for jQuery, with a focus on simple usage, attractive looks and interactive features 7. Generally, it supports all browsers that support the HTML5 canvas tag. In our design, Flot is used to visualize sensor data in both static and dynamic real-time graphical displays. In the real-time display mode, instead of refreshing and redrawing entire web page, Flot provides the capability to only update the chart with new data that are fetched periodically from the server. Ajax and jQuery are used in our design to feed the Flot charting functions with continuous flow of data from the MySQL database on the server via the web services written in PHP. The data is serialized into the JSON (JavaScript Object Notation) format to be communicated between server and client.