Transcription of AN937, Implementing a PID Controller Using a PIC18 MCU
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AN937, Implementing a PID Controller Using a PIC18 MCU
2004 Microchip Technology 1AN937 INTRODUCTIONC ontinuous processes have been controlled byfeedback loops since the late 1700 s. In 1788, JamesWatt used a flyball governor on his steam engine toregulate its speed. The Taylor Instrument Companyimplemented the first fully functional Proportional,Integral and Derivative (PID) Controller in feedback control has come a long way sinceJames Watt, the basic approach and system elementshave not changed. There are several elements within afeedback system; for discussion purposes, we will usea home heating temperature control system as ourmodel in the descriptions below. Plant The physical heating and cooling parts of the system. Sensors The devices (thermistors measuring temperature) that measure the variables within the Plant.
2004 Microchip Technology Inc. DS00937A-page 3 AN937 Firmware Variables and Constants The list of firmware variables and constants and their definitions that are discussed in this application note
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