I should explain the meaning of the calculations in the feed processing, as we are just trying it out.
the minmax feed calculations take a single valued feed (ie: not a json object, just a json numeric value), and generate the minimum, maximum and moving average values. Currently, the only parameter on minmax calculations is the maximum number of messages before min and max are set. The time constant for the moving average is .05, but will be a parameter.
When fed into the 270dial widget, the min max and moving average are displayed as two small dots and one big dot in the bezel.
The color of the big dot, the moving average, changes from red to green depending on if the change in the moving average is +ve or -ve thus showing how the signal is trending up or down.
My apologies for the lack of docs, thanks for your patience.