Update the data in your graphs in real-time, without refreshing your browser. PLOTLY

I need to display live reading of a sensor, in real time, without refreshing the browser, using plotly.

https://github.com/plotly/electricimp-streaming is an available code example. There are other tutorials out there if you search for them online.

If you embed a plot.ly chart into your website or log onto plot.ly to view your chart, it will handle the live data updates for you without need for browser refresh.