diff --git a/pkg/logfile/csv.go b/pkg/logfile/csv.go
index 2ff1d3b..1b41475 100644
--- a/pkg/logfile/csv.go
+++ b/pkg/logfile/csv.go
@@ -1,175 +1,182 @@
 package logfile
 
-// type csvLogfile struct {
-// 	logfile string
-// }
+import (
+	"encoding/csv"
+	"fmt"
+	"os"
+	"strconv"
+	"time"
 
-// func (cl *csvLogfile) GetLogfile() string {
-// 	return cl.logfile
-// }
+	"github.com/go-flucky/flucky/pkg/types"
+)
 
-// func (cl *csvLogfile) ReadHumidities() ([]*types.Humidity, error) {
-// 	if _, err := os.Stat(cl.logfile); os.IsNotExist(err) {
-// 		return nil, fmt.Errorf("%v: %v", errorLogfileNotFound, cl.logfile)
-// 	}
+type csvLogfile struct {
+	logfile string
+}
 
-// 	humidities := make([]*types.Humidity, 0)
+func (cl *csvLogfile) Append(compression bool, measuredValues []types.MeasuredValue) error {
 
-// 	f, err := os.Open(cl.logfile)
-// 	if err != nil {
-// 		return nil, fmt.Errorf("%v: %v", errorLogfileOpen, cl.logfile)
-// 	}
-// 	defer f.Close()
+	allMeasuredValues, err := cl.Read()
+	if err != nil {
+		return err
+	}
 
-// 	jsonDecoder := json.NewDecoder(f)
-// 	err = jsonDecoder.Decode(&humidities)
-// 	if err != nil {
-// 		return nil, fmt.Errorf("%v: %v", errorLogfileDecode, err)
-// 	}
+	allMeasuredValues = append(allMeasuredValues, measuredValues...)
 
-// 	return humidities, nil
-// }
+	if compression {
+		allMeasuredValues = Compression(allMeasuredValues)
+	}
 
-// func (cl *csvLogfile) ReadTemperatures() ([]*types.Temperature, error) {
+	err = cl.Write(allMeasuredValues)
+	if err != nil {
+		return err
 
-// 	if _, err := os.Stat(cl.logfile); os.IsNotExist(err) {
-// 		return nil, fmt.Errorf("%v %v: %v", errorLogfileNotFound, cl.logfile, err)
-// 	}
+	}
 
-// 	temperatures := make([]*types.Temperature, 0)
+	return nil
+}
 
-// 	f, err := os.Open(cl.logfile)
-// 	if err != nil {
-// 		return nil, fmt.Errorf("%v %v: %v", errorLogfileOpen, cl.logfile, err)
-// 	}
-// 	defer f.Close()
+func (cl *csvLogfile) Read() ([]types.MeasuredValue, error) {
+	if _, err := os.Stat(cl.logfile); os.IsNotExist(err) {
+		return nil, fmt.Errorf("%v: %v", errorLogfileNotFound, cl.logfile)
+	}
 
-// 	r := csv.NewReader(f)
-// 	records, err := r.ReadAll()
-// 	if err != nil {
-// 		return nil, fmt.Errorf("%v %v: %v", errorLogfileDecode, cl.logfile, err)
-// 	}
+	f, err := os.Open(cl.logfile)
+	if err != nil {
+		return nil, fmt.Errorf("%v: %v", errorLogfileOpen, cl.logfile)
+	}
+	defer f.Close()
 
-// 	for _, record := range records {
-// 		times := make([]time.Time, 0)
-// 		for _, j := range []int{3, 4} {
-// 			time, err := time.Parse(timeFormat, record[j])
-// 			if err != nil {
-// 				return nil, fmt.Errorf("%v %v: %v", errorParseTime, record[j], err)
-// 			}
-// 			times = append(times, time)
-// 		}
+	r := csv.NewReader(f)
+	records, err := r.ReadAll()
+	if err != nil {
+		return nil, fmt.Errorf("%v %v: %v", errorLogfileDecode, cl.logfile, err)
+	}
 
-// 		temperatureValue, err := strconv.ParseFloat(record[1], 64)
-// 		if err != nil {
-// 			return nil, fmt.Errorf("%v %v: %v", errorParseFloat, record[1], err)
-// 		}
+	measuredValues := make([]types.MeasuredValue, 0)
 
-// 		measurementUnit, err := sensor.SelectTemperatureMeasurementUnit(record[2])
-// 		if err != nil {
-// 			return nil, fmt.Errorf("%v %v: %v", errorParseMeasurementUnit, record[2], err)
-// 		}
+	for _, record := range records {
 
-// 		temperature := &types.Temperature{
-// 			TemperatureID:       record[0],        // 0
-// 			TemperatureValue:    temperatureValue, // 1
-// 			TemperatureUnit:     measurementUnit,  // 2
-// 			TemperatureFromDate: times[0],         // 3
-// 			TemperatureTillDate: times[1],         // 4
-// 			SensorID:            record[5],        // 5
-// 		}
+		// Value
+		value, err := strconv.ParseFloat(record[2], 64)
+		if err != nil {
+			return nil, fmt.Errorf("%v %v: %v", errorParseFloat, record[2], err)
+		}
 
-// 		// Creation date
-// 		temperatureCreationDate, err := time.Parse(timeFormat, record[6])
-// 		if err != nil {
-// 			return nil, fmt.Errorf("%v %v: %v", errorParseTime, record[5], err)
-// 		}
-// 		temperature.CreationDate = &temperatureCreationDate
+		// Times
+		times := make([]time.Time, 0)
+		for _, i := range []int{3, 4} {
+			time, err := time.Parse(timeFormat, record[i])
+			if err != nil {
+				return nil, fmt.Errorf("%v %v: %v", errorParseTime, record[i], err)
+			}
+			times = append(times, time)
+		}
 
-// 		if record[7] != "" {
-// 			temperatureUpdateDate, err := time.Parse(timeFormat, record[7])
-// 			if err != nil {
-// 				return nil, fmt.Errorf("%v %v: %v", errorParseTime, record[7], err)
-// 			}
+		switch record[1] {
+		case fmt.Sprint(types.MeasuredValueTypeHumidity):
+			measuredValue := &types.Humidity{
+				HumidityID: record[0], // 0
+				// 1 - MeasuredValue
+				HumidityValue:    value,     // 2
+				HumidityFromDate: times[0],  // 3
+				HumidityTillDate: times[1],  // 4
+				SensorID:         record[5], // 5
+			}
 
-// 			temperature.UpdateDate = &temperatureUpdateDate
-// 		}
+			// CreationDate
+			creationDate, err := time.Parse(timeFormat, record[6])
+			if err != nil {
+				return nil, fmt.Errorf("%v %v: %v", errorParseTime, record[6], err)
+			}
+			measuredValue.CreationDate = &creationDate
 
-// 		temperatures = append(temperatures, temperature)
-// 	}
+			// UpdateDate
+			if record[7] != "null" {
+				updateDate, err := time.Parse(timeFormat, record[7])
+				if err != nil {
+					return nil, fmt.Errorf("%v %v: %v", errorParseTime, record[7], err)
+				}
+				measuredValue.UpdateDate = &updateDate
+			}
 
-// 	return temperatures, nil
-// }
+			measuredValues = append(measuredValues, measuredValue)
 
-// func (cl *csvLogfile) WriteHumidities(humidities []*types.Humidity) error {
+		case fmt.Sprint(types.MeasuredValueTypeTemperature):
+			measuredValue := &types.Temperature{
+				TemperatureID: record[0], // 0
+				// 1 - MeasuredValue
+				TemperatureValue:    value,     // 2
+				TemperatureFromDate: times[0],  // 3
+				TemperatureTillDate: times[1],  // 4
+				SensorID:            record[5], // 5
+			}
 
-// 	f, err := os.Create(cl.logfile)
-// 	if err != nil {
-// 		return fmt.Errorf("%v: %v", errorLogfileCreate, cl.logfile)
-// 	}
-// 	defer f.Close()
+			// CreationDate
+			creationDate, err := time.Parse(timeFormat, record[6])
+			if err != nil {
+				return nil, fmt.Errorf("%v %v: %v", errorParseTime, record[6], err)
+			}
+			measuredValue.CreationDate = &creationDate
 
-// 	w := csv.NewWriter(f)
+			// UpdateDate
+			if record[7] != "null" {
+				updateDate, err := time.Parse(timeFormat, record[7])
+				if err != nil {
+					return nil, fmt.Errorf("%v %v: %v", errorParseTime, record[7], err)
+				}
+				measuredValue.UpdateDate = &updateDate
+			}
 
-// 	for _, humidity := range humidities {
-// 		w.Write([]string{
-// 			fmt.Sprintf("%v", humidity.HumidityID),
-// 			fmt.Sprintf("%v", humidity.HumidityValue),
-// 			fmt.Sprintf("%v", humidity.HumidityFromDate.Format(timeFormat)),
-// 			fmt.Sprintf("%v", humidity.HumidityTillDate.Format(timeFormat)),
-// 			fmt.Sprintf("%v", humidity.SensorID),
-// 			fmt.Sprintf("%v", humidity.CreationDate.Format(timeFormat)),
-// 			fmt.Sprintf("%v", humidity.UpdateDate.Format(timeFormat)),
-// 		})
-// 	}
+			measuredValues = append(measuredValues, measuredValue)
+		default:
+			continue
+		}
 
-// 	w.Flush()
+	}
 
-// 	return nil
-// }
+	return measuredValues, nil
 
-// func (cl *csvLogfile) WriteTemperatures(temperatures []*types.Temperature) error {
-// 	f, err := os.Create(cl.logfile)
-// 	if err != nil {
-// 		return fmt.Errorf("%v: %v", errorLogfileCreate, cl.logfile)
-// 	}
-// 	defer f.Close()
+}
 
-// 	writeCreationDate(temperatures)
+func (cl *csvLogfile) Write(measuredValues []types.MeasuredValue) error {
+	f, err := os.Create(cl.logfile)
+	if err != nil {
+		return fmt.Errorf("%v: %v", errorLogfileCreate, cl.logfile)
+	}
+	defer f.Close()
 
-// 	w := csv.NewWriter(f)
+	writeCreationDate(measuredValues)
 
-// 	for _, temperature := range temperatures {
-// 		record := make([]string, 0)
+	w := csv.NewWriter(f)
 
-// 		if temperature.UpdateDate != nil {
-// 			record = []string{
-// 				fmt.Sprintf("%v", temperature.TemperatureID),
-// 				fmt.Sprintf("%v", temperature.TemperatureValue),
-// 				fmt.Sprintf("%v", temperature.TemperatureUnit),
-// 				fmt.Sprintf("%v", temperature.TemperatureFromDate.Format(timeFormat)),
-// 				fmt.Sprintf("%v", temperature.TemperatureTillDate.Format(timeFormat)),
-// 				fmt.Sprintf("%v", temperature.SensorID),
-// 				fmt.Sprintf("%v", temperature.CreationDate.Format(timeFormat)),
-// 				fmt.Sprintf("%v", temperature.UpdateDate.Format(timeFormat)),
-// 			}
-// 		} else {
-// 			record = []string{
-// 				fmt.Sprintf("%v", temperature.TemperatureID),
-// 				fmt.Sprintf("%v", temperature.TemperatureValue),
-// 				fmt.Sprintf("%v", temperature.TemperatureUnit),
-// 				fmt.Sprintf("%v", temperature.TemperatureFromDate.Format(timeFormat)),
-// 				fmt.Sprintf("%v", temperature.TemperatureTillDate.Format(timeFormat)),
-// 				fmt.Sprintf("%v", temperature.SensorID),
-// 				fmt.Sprintf("%v", temperature.CreationDate.Format(timeFormat)),
-// 				fmt.Sprintf(""),
-// 			}
-// 		}
+	for _, measuredValue := range measuredValues {
 
-// 		w.Write(record)
-// 	}
+		record := []string{
+			measuredValue.GetID(),
+			fmt.Sprintf("%v", measuredValue.GetMeasuredValueType()),
+			fmt.Sprintf("%v", measuredValue.GetValue()),
+			measuredValue.GetFromDate().Format(timeFormat),
+			measuredValue.GetTillDate().Format(timeFormat),
+			measuredValue.GetSensorID(),
+		}
 
-// 	w.Flush()
+		if measuredValue.GetCreationDate() != nil {
+			record = append(record, measuredValue.GetCreationDate().Format(timeFormat))
+		} else {
+			record = append(record, "null")
+		}
 
-// 	return nil
-// }
+		if measuredValue.GetUpdateDate() != nil {
+			record = append(record, measuredValue.GetUpdateDate().Format(timeFormat))
+		} else {
+			record = append(record, "null")
+		}
+
+		w.Write(record)
+	}
+
+	w.Flush()
+
+	return nil
+}
diff --git a/pkg/logfile/interfaces.go b/pkg/logfile/interfaces.go
index b66a0d1..2589174 100644
--- a/pkg/logfile/interfaces.go
+++ b/pkg/logfile/interfaces.go
@@ -7,7 +7,5 @@ import (
 type Logfile interface {
 	Append(compression bool, measuredValues []types.MeasuredValue) error
 	Read() ([]types.MeasuredValue, error)
-	// ReadCustom(r io.Reader) ([]types.MeasuredValue, error)
 	Write(measuredValues []types.MeasuredValue) error
-	// WriteCustom(w io.Writer, measuredValues []types.MeasuredValue) error
 }
diff --git a/pkg/logfile/logfile.go b/pkg/logfile/logfile.go
index cef5d8f..12ab8b0 100644
--- a/pkg/logfile/logfile.go
+++ b/pkg/logfile/logfile.go
@@ -71,13 +71,13 @@ func Compression(measuredValues []types.MeasuredValue) []types.MeasuredValue {
 // into the correct format.
 func New(logfile string) Logfile {
 
-	ext := filepath.Join(logfile)
+	ext := filepath.Ext(logfile)
 
 	switch ext {
-	// case ".csv":
-	// 	return &csvLogfile{
-	// 		logfile: logfile,
-	// 	}
+	case ".csv":
+		return &csvLogfile{
+			logfile: logfile,
+		}
 	case ".json":
 		return &jsonLogfile{
 			logfile: logfile,
diff --git a/pkg/types/humidity.go b/pkg/types/humidity.go
index 2905a2e..a8e1cd2 100644
--- a/pkg/types/humidity.go
+++ b/pkg/types/humidity.go
@@ -37,6 +37,10 @@ func (h *Humidity) GetCreationDate() *time.Time {
 	return h.CreationDate
 }
 
+func (h *Humidity) GetUpdateDate() *time.Time {
+	return h.UpdateDate
+}
+
 func (h *Humidity) GetMeasuredValueType() MeasuredValueType {
 	return MeasuredValueTypeHumidity
 }
diff --git a/pkg/types/measuredValue.go b/pkg/types/measuredValue.go
index 26f0a5e..7c40d38 100644
--- a/pkg/types/measuredValue.go
+++ b/pkg/types/measuredValue.go
@@ -4,14 +4,16 @@ import "time"
 
 type MeasuredValue interface {
 	GetID() string
-	GetCreationDate() *time.Time
 	GetMeasuredValueType() MeasuredValueType
+	GetValue() float64
 	GetFromDate() time.Time
 	GetTillDate() time.Time
 	GetSensorID() string
-	GetValue() float64
-	SetCreationDate(date *time.Time)
+	GetCreationDate() *time.Time
+	GetUpdateDate() *time.Time
+
 	SetTillDate(date time.Time)
+	SetCreationDate(date *time.Time)
 	SetUpdateDate(date *time.Time)
 }
 
diff --git a/pkg/types/temperature.go b/pkg/types/temperature.go
index 2faef2e..b001474 100644
--- a/pkg/types/temperature.go
+++ b/pkg/types/temperature.go
@@ -1,6 +1,8 @@
 package types
 
-import "time"
+import (
+	"time"
+)
 
 // Temperature ...
 type Temperature struct {
@@ -37,6 +39,10 @@ func (t *Temperature) GetCreationDate() *time.Time {
 	return t.CreationDate
 }
 
+func (t *Temperature) GetUpdateDate() *time.Time {
+	return t.UpdateDate
+}
+
 func (t *Temperature) GetMeasuredValueType() MeasuredValueType {
 	return MeasuredValueTypeTemperature
 }