The SparkFun Photon Weather Shield is an easy-to-use add-on board that grants you access to barometric pressure, relative humidity, and temperature. There are also connections on this shield to optional sensors such as wind speed, direction, rain gauge and soil readings!
These Weather Shields utilize the Si7021 temperature/humidity and MPL3115A2 barometric pressure sensors. Each shield comes with two RJ11 connectors (for optional hookup of rain and wind sensors) and a 3-pin soil temperature and moisture hookup. Finally, each Weather Shield can attach effectively and easily to your Photon in no time at all!
The Particle Photon is a tiny WiFi development kit for creating connected projects and products. Sporting a 120MHz ARM Cortex M3 and built-in WiFi, the Photon is not only powerful but easy to use. The small form factor is ideal for IoT projects with cloud connectivity.
If you are finding that the barometric pressure readings you are getting are off, you may need to correct pressure for altitude. For instance, In Denver, if the pressure is measured by NOAA 29.92"Hg it's already been corrected for altitude. The weather shield is going to read actual pressure, not pressure that has been corrected for altitude and you should expect to see a reading of about 24.73"Hg. Below is a link to a calculator that will give you a correction factor for whatever altitude your station is at. Link to calculator
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This works with the Particle.io Photon (wifi) and Electron (3G cellular) . As you are aware 3G service is going away . The Particle.io 4g Boron is not pin compatible with this this board. Yes it can be used but it requires a lash up of jumper wires and small changes to the pin out assignments of my code. It would be nice if it were updated!