Mercurial > mbsePi-apps / file diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/brewco/pid.h	Wed Nov 25 22:49:35 2015 +0100
@@ -0,0 +1,31 @@
+#ifndef	PID_H
+#define	PID_H
+
+#define	PID_MODE_NONE		0	/* Process control off				*/
+#define	PID_MODE_AUTO		1	/* Process control auto				*/
+#define	PID_MODE_BOO		2	/* Process control Bang On/Off			*/
+
+#define	PID_TIMES		60	/* 60 calculations per minute			*/
+#define	PID_WINDUP_GUARD	10.0	/* Error windup guard				*/
+
+
+typedef struct _pid_var {
+	double		iMax;		/* Maximum allowable integrator state		*/
+	double		iGain;		/* Integral gain				*/
+	double		pGain;		/* Proportional gain				*/
+	double		dGain;		/* Derivative gain				*/
+
+	double		Input;		/* Input value					*/
+	double		Err;		/* Error, diff between input and set point	*/
+	double		ErrLast;	/* Error from last pass				*/
+	double		iState;		/* Error from next last pass			*/
+	double		SetP;		/* Set point					*/
+	double		OutP;		/* Output of PID algorithm			*/
+	int		Mode;		/* Value is 'PID_AUTO' if loop is automatic	*/
+} pid_var;
+
+
+void InitPID( pid_var *);
+void UpdatePID( pid_var *);
+
+#endif