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Get the trend of a barometer over time

Package Exports

  • signalk-barometer-trend

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (signalk-barometer-trend) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

signalk-barometer-trend

Calculate the pressure trend of a barometer. Are there foul weather on the way?

Install & Use

Note: To use this plugin you need a barometer connected to SignalK, i.e. the bme680, outputting the sentence 'environment.outside.pressure'.

Install the plugin through the SignalK plugin interface.
After installation you may want to 'Activate' it through the SignalK Plugin Config interface.

The plugin will output two new SignalK values:

'environment.outside.pressure.trend'
'environment.outside.pressure.trend.text'

From the environment.outside.pressure.trend value you could for example setup an alarm (using another plugin) if the trend is changing fast, possibly indicating foul weather.

PS: It might take a couple of minutes before the plugin show any data, as it need to collect pressure readings to calculate a trend. The plugin is setup to read the pressure every 1 minute. Pressure readings older than three hours will be discarded.

A real world example

This is actual data while developing the plugin. A tropical wave, OT-48, was moving through the Caribbean creating local heavy rainfall and stormy wind in Guadeloupe.

SigK Pressure Trend

Meteo France - Guadeloupe Radar NOAA Satelitte Photo

The above GIF-animation is actual radar image from Meteo France at the time.
The above satelitte photo animation is from NOAA.

Possible values are

FALLING: RISING:
FALLING.STEADY RISING.STEADY
FALLING.SLOW RISING.SLOW
FALLING.CHANGING RISING.CHANGING
FALLING.QUICKLY RISING.QUICKLY
FALLING.RAPIDLY RISING.RAPIDLY

Contribute

Please feel free to contribute to this plugin by creating a Pull Request including test code.

Disclaimer

This plugin is based on the GitHub project 'barometer-trend', also by the same author.