[[File:PID en.svg|right|thumb|400x400px|A [[block diagram]] of a PID controller in a feedback loop, r(''t'') is the desired process value or "set point", and y(''t'') is the measured process value.]]
A '''proportional–integral–derivative controller ''' ('''PID controller''') is a [[control loop]] [[feedback mechanism]] control technique widely used in control systems.
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A proportional–integral–derivative controller (PID controller) is a control loop feedback mechanism control technique widely used in control systems.