/**
     * Creates a list that populates sensor combo boxes
     * @param cellNumber The column to get data from
     * @return sensorList Populates the sensor combo box
     */
    public static List setSensorList(Sheet sheet, int cellNumber) {

            int i = 1;
            sensorList.clear();

            // A loop to get data from the column until it hits an empty cell
            do {
                row = sheet.getRow(i);
                cell = row.getCell(cellNumber);
                if (cell != null) {
                    sensorList.add(cell.toString());
                    System.out.println(cell);
                }
                i++;
            } while (cell != null);

        return sensorList;
    }