Office Neighbor Shield with Arduino

#include "Global.h"

const int DELTA_THRESHOLD = 5;    // Any change below this threshold will not be performed, to smooth random noise in readings
const float STEPPER_RATIO = 0.15;  // Mapping ration between potentiometer and stepper movement
const int STEP_INTERVAL   = 1000; // Stepper Driver timing in us (probably no need to change this parameter)
int curPos = 0;                   // Remember the stepper's current position
const int numReadings = 500;
int readings[numReadings];      // the readings from the analog input
int readIndex = 0;              // the index of the current reading
int total = 0;                  // the running total
int average = 0;                // the average




void setup() {
  // Setup Serial which is useful for debugging
  // Use the Serial Monitor to view printed messages
  Serial.begin(9600);
  Serial.println("start");
    for (int thisReading = 0; thisReading < numReadings; thisReading++) {
    readings[thisReading] = 0;
  }
  stepperMotor.write(0, 1000, STEP_INTERVAL);

}

void loop() {
  int mappedPotVal = potentiometer.read();
  mappedPotVal = map(mappedPotVal, 221, 950, 0, 1024);
 
 // subtract the last reading:
  total = total - readings[readIndex];
  // read from the sensor:
  readings[readIndex] = mappedPotVal;
  // add the reading to the total:
  total = total + readings[readIndex];
  // advance to the next position in the array:
  readIndex = readIndex + 1;

  // if we're at the end of the array...
  if (readIndex >= numReadings) {
    // ...wrap around to the beginning:
    readIndex = 0;
  }

  // calculate the average:
  average = total / numReadings;
  // send it to the computer as ASCII digits
// Serial.println(average);


  



  int targetPos = mappedPotVal * STEPPER_RATIO;
  int deltaPos = targetPos - curPos;


  // if the difference is pos is very small, don't do anything
  if (abs(deltaPos) < DELTA_THRESHOLD)
  {
    delay(1);
    return;
  }

  // Determine correct direction to move
  if (deltaPos > 0)
    stepperMotor.write(1, abs(deltaPos), STEP_INTERVAL);
  else
    stepperMotor.write(0, abs(deltaPos), STEP_INTERVAL);

  curPos = targetPos;


}