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This application note discusses digital filter implementation of Proportional, Integral, Differential (PID) control algorithms. The implementation takes advantage of the control-oriented digital signal processing capabilities of the Motorola M68HC16 family of modular microcontrollers.Microcontrollers have come a long way in the past two decades. Once relegated strictly to computer applications, these devices have steadily encroached on domains previously dominated by analog technology. Closed-loop control systems are among the most recent bastions to fall. Control systems based on digital processing of measured values are inherently less sensitive to changes in temperature and to aging thansystems implemented with analog circuitry. In addition, digital system performance can be changed by developing new software rather than by physically altering a PC board. In fact, many emerging controller technologies, such as adaptive control, would be economically unattainable if not for digital processing capabilities.
