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 }