(This is the last modification in a larger series on writing a solid PID algorithm) The Problem The processes the PID will be connected to fall into two groups: direct acting and reverse acting. All the examples I've shown so far have been direct acting. That is, an increase in the output causes an increase in the input. For reverse acting processes the opposite is true. In a refrigerator for example, an increase in cooling causes the temperature to go down. To make the beginner PID work with a
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