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I came across this article by chance:   http://fermentationriot.com/arduinopid.php The article describes a very sophisticated Arduino data collection and display system for a home brewing setup. The data display, in a browser window, interested me because it exploits  free to use  javascript modules, developed and hosted by Google. This post concentrates on one particular module which draws analog meter displays, or gauges: https://developers.google.com/chart/inte ...