Today I have been experimenting with the Particle Photon and logging environment data to the internet via the Data.SparkFun.com. Data.SparkFun.com is a free service for posting, storing, and reading sets of data. It’s powered by Phant, an open-source, Node.js-based tool that can be run on any server or computer. Once the data data feed has some data  I can start charting it using a number of free services. Following Sparkfuns tutorial I am using Googles Charts to graph live data on my web site. Adding a barometric sensor to this wouldn't be hard and would make for some interesting weather studies.

Sparkfun Tutorial

Graphing Live Data With Google Charts Tutorial

Sample Live Chart, updated every 60 seconds, from my experiment