Another plasma component...

#define BUFSIZE 1000 // maximum number of readings to average torch volts
double buf[BUFSIZE];

float avgarcvolts(double tvolts, int iscutting, int buffersize)
{
	// Calculates the moving average of buffersize readings
	
	static double *b, *p = &buf[0];	  // pointers for beginning of buffer and current position
	static double *e = &buf[buffersize];   // pointer for end of buffer
	static int   wascutting = 0;		// cutting state last time
    static double sumvolts = 0.0;		// Sum of readings in buffer
    static int numreadings = 0;			// number of readings in buffer
    
	if(!iscutting && wascutting){
		// Torch just turned off, so reset the variables
		p = b;
		sumvolts = 0.0;
		numreadings = 0;
		wascutting = iscutting; 		//and save the state
		return(0.0);
	}
	if(iscutting){		// Arc_OK is on so lets start gathering data to average
		*p++ = tvolts;	// Save volts to the buffer and increment pointer
		if(numreadings < buffersize)
			numreadings++;
		if(p > e)  // if we've gone past the end of the buffer, wrap to the beginning
			p = b;
		sumvolts += tvolts;	// add the new reading
		if(numreadings >= buffersize)
			sumvolts -= *p;  // subtract the oldest reading (which is this one)
	}
	wascutting = iscutting; 	//and save the state
	if(numreadings)					
		return(sumvolts/(double)numreadings);  // return Average volts
	else
		return (0.0);	// catch divide by zero errors
}