fix(pkg/sensor): temperature measurement unit

cmd/temperature/read.go

@@ -9,6 +9,7 @@ import (
 	"github.com/go-flucky/flucky/pkg/config"
 	"github.com/go-flucky/flucky/pkg/logfile"
 	"github.com/go-flucky/flucky/pkg/sensor"
+	"github.com/go-flucky/flucky/pkg/types"
 	"github.com/spf13/cobra"
 )
 
@@ -34,7 +35,7 @@ var readTemperatureCmd = &cobra.Command{
 			temperatureSensors = cnf.GetTemperatureSensorsByName(args)
 		}
 
-		temperatures, err := sensor.ReadTemperatures(temperatureSensors, round)
+		temperatures, err := sensor.ReadTemperatures(temperatureSensors, types.DegreeCelsius, round)
 		if err != nil {
 			log.Fatalln(err)
 		}

pkg/daemon/daemon.go

@@ -38,7 +38,7 @@ func Start(cnf *config.Configuration, cleanCacheInterval time.Duration, compress
 	childContext, cancel := context.WithCancel(ctx)
 
 	// go sensor.ReadHumiditiesContinuously(cnf.GetHumiditySensors(config.ENABLED), humidityChannel, errorChannel)
-	go sensor.ReadTemperaturesContinuously(childContext, cnf.GetTemperatureSensors(config.ENABLED), round, temperatureChannel, errorChannel)
+	go sensor.ReadTemperaturesContinuously(childContext, cnf.GetTemperatureSensors(config.ENABLED), types.DegreeCelsius, round, temperatureChannel, errorChannel)
 
 	temperatureCache := make([]*types.Temperature, 0)
 

pkg/logfile/csv.go

@@ -8,6 +8,7 @@ import (
 	"strconv"
 	"time"
 
+	"github.com/go-flucky/flucky/pkg/sensor"
 	"github.com/go-flucky/flucky/pkg/types"
 )
 
@@ -63,7 +64,7 @@ func (cl *csvLogfile) ReadTemperatures() ([]*types.Temperature, error) {
 
 	for _, record := range records {
 		times := make([]time.Time, 0)
-		for _, j := range []int{2, 3} {
+		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)
@@ -76,25 +77,31 @@ func (cl *csvLogfile) ReadTemperatures() ([]*types.Temperature, error) {
 			return nil, fmt.Errorf("%v %v: %v", errorParseFloat, record[1], err)
 		}
 
+		measurementUnit, err := sensor.SelectTemperatureMeasurementUnit(record[2])
+		if err != nil {
+			return nil, fmt.Errorf("%v %v: %v", errorParseMeasurementUnit, record[2], err)
+		}
+
 		temperature := &types.Temperature{
-			TemperatureID:       record[0],
+			TemperatureID:       record[0],        // 0
-			TemperatureValue:    temperatureValue,
+			TemperatureValue:    temperatureValue, // 1
-			TemperatureFromDate: times[0],
+			TemperatureDegree:   measurementUnit,  // 2
-			TemperatureTillDate: times[1],
+			TemperatureFromDate: times[0],         // 3
-			SensorID:            record[4],
+			TemperatureTillDate: times[1],         // 4
+			SensorID:            record[5],        // 5
 		}
 
 		// Creation date
-		temperatureCreationDate, err := time.Parse(timeFormat, record[5])
+		temperatureCreationDate, err := time.Parse(timeFormat, record[6])
 		if err != nil {
 			return nil, fmt.Errorf("%v %v: %v", errorParseTime, record[5], err)
 		}
 		temperature.CreationDate = &temperatureCreationDate
 
-		if record[6] != "" {
+		if record[7] != "" {
-			temperatureUpdateDate, err := time.Parse(timeFormat, record[6])
+			temperatureUpdateDate, err := time.Parse(timeFormat, record[7])
 			if err != nil {
-				return nil, fmt.Errorf("%v %v: %v", errorParseTime, record[6], err)
+				return nil, fmt.Errorf("%v %v: %v", errorParseTime, record[7], err)
 			}
 
 			temperature.UpdateDate = &temperatureUpdateDate
@@ -151,6 +158,7 @@ func (cl *csvLogfile) WriteTemperatures(temperatures []*types.Temperature) error
 			record = []string{
 				fmt.Sprintf("%v", temperature.TemperatureID),
 				fmt.Sprintf("%v", temperature.TemperatureValue),
+				fmt.Sprintf("%v", temperature.TemperatureDegree),
 				fmt.Sprintf("%v", temperature.TemperatureFromDate.Format(timeFormat)),
 				fmt.Sprintf("%v", temperature.TemperatureTillDate.Format(timeFormat)),
 				fmt.Sprintf("%v", temperature.SensorID),
@@ -161,6 +169,7 @@ func (cl *csvLogfile) WriteTemperatures(temperatures []*types.Temperature) error
 			record = []string{
 				fmt.Sprintf("%v", temperature.TemperatureID),
 				fmt.Sprintf("%v", temperature.TemperatureValue),
+				fmt.Sprintf("%v", temperature.TemperatureDegree),
 				fmt.Sprintf("%v", temperature.TemperatureFromDate.Format(timeFormat)),
 				fmt.Sprintf("%v", temperature.TemperatureTillDate.Format(timeFormat)),
 				fmt.Sprintf("%v", temperature.SensorID),

pkg/logfile/errors.go

@@ -13,6 +13,7 @@ var errorLogfileUnmarshal = errors.New("Can not unmarshal values")
 var errorLogfileWrite = errors.New("Can not write with given writer")
 
 var errorParseFloat = errors.New("Can not parse float")
+var errorParseMeasurementUnit = errors.New("Can not parse mesaurement unit")
 var errorParseTime = errors.New("Can not parse time")
 
 var errorNoValidHumidityID = errors.New("No valid humidity id detected or available")

pkg/logfile/logfile_test.go

@@ -27,8 +27,8 @@ func TestConvert(t *testing.T) {
 	markupLanguages := []string{"csv", "json", "xml"}
 
 	for _, markupLanguageFrom := range markupLanguages {
-		testDir, cleanup := createTestDir(t)
+		testDir, _ := createTestDir(t)
-		defer cleanup()
+		//defer cleanup()
 
 		for _, markupLanguageTo := range markupLanguages {
 

pkg/logfile/test/csv/validTemperatures_01.csv

@@ -1,2 +1,2 @@
-a469503b-fc16-4e72-8d29-7eeee08ba957,24.562,2019-06-14 21:15:28.504051541 +0200,2019-06-14 21:18:07.384104493 +0200,84eac248-6927-4db6-b6f9-7891ce2d301e,2019-06-14 21:18:07.465885864 +0200,2019-06-14 21:18:07.46587076 +0200
+a469503b-fc16-4e72-8d29-7eeee08ba957,24.562,celsius,2019-06-14 21:15:28.504051541 +0200,2019-06-14 21:18:07.384104493 +0200,84eac248-6927-4db6-b6f9-7891ce2d301e,2019-06-14 21:18:07.465885864 +0200,2019-06-14 21:18:07.46587076 +0200
-5f119ba3-bcea-4c3b-aabb-0406ea70f7e1,24.375,2019-06-14 21:15:28.583856443 +0200,2019-06-14 21:18:07.463893776 +0200,efcd755e-82d1-4789-a50b-355b8735b8d8,2019-06-14 21:18:07.465885864 +0200,2019-06-14 21:18:07.46587701 +0200
+5f119ba3-bcea-4c3b-aabb-0406ea70f7e1,24.375,celsius,2019-06-14 21:15:28.583856443 +0200,2019-06-14 21:18:07.463893776 +0200,efcd755e-82d1-4789-a50b-355b8735b8d8,2019-06-14 21:18:07.465885864 +0200,2019-06-14 21:18:07.46587701 +0200

pkg/logfile/test/csv/validTemperatures_02.csv

@@ -1,2 +1,2 @@
-a469503b-fc16-4e72-8d29-7eeee08ba957,24.562,2019-06-14 21:15:28.504051541 +0200,2019-06-14 21:18:07.384104493 +0200,84eac248-6927-4db6-b6f9-7891ce2d301e,2019-06-14 21:18:07.465885864 +0200,2019-06-14 21:18:07.46587076 +0200
+a469503b-fc16-4e72-8d29-7eeee08ba957,24.562,celsius,2019-06-14 21:15:28.504051541 +0200,2019-06-14 21:18:07.384104493 +0200,84eac248-6927-4db6-b6f9-7891ce2d301e,2019-06-14 21:18:07.465885864 +0200,2019-06-14 21:18:07.46587076 +0200
-5f119ba3-bcea-4c3b-aabb-0406ea70f7e1,24.375,2019-06-14 21:15:28.583856443 +0200,2019-06-14 21:15:28.583856443 +0200,efcd755e-82d1-4789-a50b-355b8735b8d8,2019-06-14 21:18:07.465885864 +0200,
+5f119ba3-bcea-4c3b-aabb-0406ea70f7e1,24.375,celsius,2019-06-14 21:15:28.583856443 +0200,2019-06-14 21:15:28.583856443 +0200,efcd755e-82d1-4789-a50b-355b8735b8d8,2019-06-14 21:18:07.465885864 +0200,

pkg/logfile/test/json/faultyTemperatures_01.json

@@ -2,6 +2,7 @@
   {
     "temperature_id": "a469503b-fc16-4e72-8d29-7eeee08ba957",
     "temperature_value": "24.562",
+    "temperature_degree": "celsius",
     "temperature_from_date": "2019-10-01T00:00:00+02:00",
     "temperature_till_date": "2019-05-01T00:00:00+02:00",
     "sensor_id": "84eac248-6927-4db6-b6f9-7891ce2d301e",

pkg/logfile/test/json/faultyTemperatures_02.json

@@ -2,6 +2,7 @@
   {
     "temperature_id": "a469503b-fc16-4e72-8d29-7eeee08ba957",
     "temperature_value": "24.562",
+    "temperature_degree": "celsius",
     "temperature_from_date": "2019-05-01T00:00:00+02:00",
     "temperature_till_date": "2019-10-01T00:00:00+02:00",
     "sensor_id": "84eac248-6927-4db6-b6f9-7891ce2d301e",

pkg/logfile/test/json/faultyTemperatures_03.json

@@ -2,6 +2,7 @@
   {
     "temperature_id": "a469503b-fc16-4e72-8d29-7eeee08ba957",
     "temperature_value": "24.562",
+    "temperature_degree": "celsius",
     "temperature_from_date": "2019-05-01T00:00:00+02:00",
     "temperature_till_date": "2019-10-01T00:00:00+02:00",
     "sensor_id": "",

pkg/logfile/test/json/faultyTemperatures_04.json

@@ -2,6 +2,7 @@
   {
     "temperature_id": "a469503b-fc16-4e72-8d29-7eeee08ba957",
     "temperature_value": "0",
+    "temperature_degree": "celsius",
     "temperature_from_date": "2019-05-01T00:00:00+02:00",
     "temperature_till_date": "2019-10-01T00:00:00+02:00",
     "sensor_id": "84eac248-6927-4db6-b6f9-7891ce2d301e",

pkg/logfile/test/json/faultyTemperatures_05.json

@@ -2,6 +2,7 @@
   {
     "temperature_id": "",
     "temperature_value": "24.562",
+    "temperature_degree": "celsius",
     "temperature_from_date": "2019-05-01T00:00:00+02:00",
     "temperature_till_date": "2019-10-01T00:00:00+02:00",
     "sensor_id": "84eac248-6927-4db6-b6f9-7891ce2d301e",

pkg/logfile/test/json/validTemperatures_01.json

@@ -2,6 +2,7 @@
   {
     "temperature_id": "a469503b-fc16-4e72-8d29-7eeee08ba957",
     "temperature_value": "24.562",
+    "temperature_degree": "celsius",
     "temperature_from_date": "2019-06-14T21:15:28.504051541+02:00",
     "temperature_till_date": "2019-06-14T21:18:07.384104493+02:00",
     "sensor_id": "84eac248-6927-4db6-b6f9-7891ce2d301e",
@@ -11,6 +12,7 @@
   {
     "temperature_id": "5f119ba3-bcea-4c3b-aabb-0406ea70f7e1",
     "temperature_value": "24.375",
+    "temperature_degree": "celsius",
     "temperature_from_date": "2019-06-14T21:15:28.583856443+02:00",
     "temperature_till_date": "2019-06-14T21:18:07.463893776+02:00",
     "sensor_id": "efcd755e-82d1-4789-a50b-355b8735b8d8",

pkg/logfile/test/json/validTemperatures_02.json

@@ -2,6 +2,7 @@
   {
     "temperature_id": "a469503b-fc16-4e72-8d29-7eeee08ba957",
     "temperature_value": "24.562",
+    "temperature_degree": "celsius",
     "temperature_from_date": "2019-06-14T21:15:28.504051541+02:00",
     "temperature_till_date": "2019-06-14T21:18:07.384104493+02:00",
     "sensor_id": "84eac248-6927-4db6-b6f9-7891ce2d301e",
@@ -11,6 +12,7 @@
   {
     "temperature_id": "5f119ba3-bcea-4c3b-aabb-0406ea70f7e1",
     "temperature_value": "24.375",
+    "temperature_degree": "celsius",
     "temperature_from_date": "2019-06-14T21:15:28.583856443+02:00",
     "temperature_till_date": "2019-06-14T21:15:28.583856443+02:00",
     "sensor_id": "efcd755e-82d1-4789-a50b-355b8735b8d8",

pkg/logfile/test/xml/validTemperatures_01.xml

@@ -2,6 +2,7 @@
   <temperature>
     <temperature_id>a469503b-fc16-4e72-8d29-7eeee08ba957</temperature_id>
     <temperature_value>24.562</temperature_value>
+    <temperature_degree>celsius</temperature_degree>
     <temperature_from_date>2019-06-14T21:15:28.504051541+02:00</temperature_from_date>
     <temperature_till_date>2019-06-14T21:18:07.384104493+02:00</temperature_till_date>
     <sensor_id>84eac248-6927-4db6-b6f9-7891ce2d301e</sensor_id>
@@ -11,6 +12,7 @@
   <temperature>
     <temperature_id>5f119ba3-bcea-4c3b-aabb-0406ea70f7e1</temperature_id>
     <temperature_value>24.375</temperature_value>
+    <temperature_degree>celsius</temperature_degree>
     <temperature_from_date>2019-06-14T21:15:28.583856443+02:00</temperature_from_date>
     <temperature_till_date>2019-06-14T21:18:07.463893776+02:00</temperature_till_date>
     <sensor_id>efcd755e-82d1-4789-a50b-355b8735b8d8</sensor_id>

pkg/logfile/test/xml/validTemperatures_02.xml

@@ -2,6 +2,7 @@
   <temperature>
     <temperature_id>a469503b-fc16-4e72-8d29-7eeee08ba957</temperature_id>
     <temperature_value>24.562</temperature_value>
+    <temperature_degree>celsius</temperature_degree>
     <temperature_from_date>2019-06-14T21:15:28.504051541+02:00</temperature_from_date>
     <temperature_till_date>2019-06-14T21:18:07.384104493+02:00</temperature_till_date>
     <sensor_id>84eac248-6927-4db6-b6f9-7891ce2d301e</sensor_id>
@@ -11,6 +12,7 @@
   <temperature>
     <temperature_id>5f119ba3-bcea-4c3b-aabb-0406ea70f7e1</temperature_id>
     <temperature_value>24.375</temperature_value>
+    <temperature_degree>celsius</temperature_degree>
     <temperature_from_date>2019-06-14T21:15:28.583856443+02:00</temperature_from_date>
     <temperature_till_date>2019-06-14T21:15:28.583856443+02:00</temperature_till_date>
     <sensor_id>efcd755e-82d1-4789-a50b-355b8735b8d8</sensor_id>

pkg/sensor/dht11.go

@@ -87,7 +87,7 @@ func (s *DHT11) ReadHumidityContinously(ctx context.Context, round float64, humi
 }
 
 // ReadTemperature measure the temperature
-func (s *DHT11) ReadTemperature(round float64) (*types.Temperature, error) {
+func (s *DHT11) ReadTemperature(degree types.Degree, round float64) (*types.Temperature, error) {
 	err := dht.HostInit()
 	if err != nil {
 		return nil, fmt.Errorf("HostInit error: %v", err)
@@ -108,6 +108,9 @@ func (s *DHT11) ReadTemperature(round float64) (*types.Temperature, error) {
 		return nil, fmt.Errorf("Read error: %v", err)
 	}
 
+	// Convert temperature degree
+	temperatureValue = convertTemperatureMeasurementUnit(temperatureValue, types.DegreeCelsius, degree)
+
 	if round != 0 {
 		temperatureValue = math.Round(temperatureValue/round) * round
 	}
@@ -115,6 +118,7 @@ func (s *DHT11) ReadTemperature(round float64) (*types.Temperature, error) {
 	temperature := &types.Temperature{
 		TemperatureID:       uuid.NewV4().String(),
 		TemperatureValue:    temperatureValue,
+		TemperatureDegree:   degree,
 		TemperatureFromDate: time.Now(),
 		TemperatureTillDate: time.Now(),
 		SensorID:            s.SensorID,
@@ -124,12 +128,12 @@ func (s *DHT11) ReadTemperature(round float64) (*types.Temperature, error) {
 }
 
 // ReadTemperatureWriteIntoChannel and write values into a channel
-func (s *DHT11) ReadTemperatureWriteIntoChannel(round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error, wg *sync.WaitGroup) {
+func (s *DHT11) ReadTemperatureWriteIntoChannel(degree types.Degree, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error, wg *sync.WaitGroup) {
 	if wg != nil {
 		defer wg.Done()
 	}
 
-	temperature, err := s.ReadTemperature(round)
+	temperature, err := s.ReadTemperature(degree, round)
 	if err != nil {
 		errorChannel <- err
 		return
@@ -138,14 +142,14 @@ func (s *DHT11) ReadTemperatureWriteIntoChannel(round float64, temperatureChanne
 }
 
 // ReadTemperatureContinously into a channel until context closed
-func (s *DHT11) ReadTemperatureContinously(ctx context.Context, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error) {
+func (s *DHT11) ReadTemperatureContinously(ctx context.Context, degree types.Degree, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error) {
 	for {
 		select {
 		case <-ctx.Done():
 			errorChannel <- fmt.Errorf("%v: Context closed: %v", s.SensorName, ctx.Err())
 			return
 		default:
-			s.ReadTemperatureWriteIntoChannel(round, temperatureChannel, errorChannel, nil)
+			s.ReadTemperatureWriteIntoChannel(degree, round, temperatureChannel, errorChannel, nil)
 		}
 	}
 }

pkg/sensor/dht22.go

@@ -87,7 +87,7 @@ func (s *DHT22) ReadHumidityContinously(ctx context.Context, round float64, humi
 }
 
 // ReadTemperature measure the temperature
-func (s *DHT22) ReadTemperature(round float64) (*types.Temperature, error) {
+func (s *DHT22) ReadTemperature(degree types.Degree, round float64) (*types.Temperature, error) {
 	err := dht.HostInit()
 	if err != nil {
 		return nil, fmt.Errorf("HostInit error: %v", err)
@@ -108,6 +108,9 @@ func (s *DHT22) ReadTemperature(round float64) (*types.Temperature, error) {
 		return nil, fmt.Errorf("Read error: %v", err)
 	}
 
+	// Convert temperature degree
+	temperatureValue = convertTemperatureMeasurementUnit(temperatureValue, types.DegreeCelsius, degree)
+
 	// round
 	if round != 0 {
 		temperatureValue = math.Round(temperatureValue/round) * round
@@ -116,6 +119,7 @@ func (s *DHT22) ReadTemperature(round float64) (*types.Temperature, error) {
 	temperature := &types.Temperature{
 		TemperatureID:       uuid.NewV4().String(),
 		TemperatureValue:    temperatureValue,
+		TemperatureDegree:   degree,
 		TemperatureFromDate: time.Now(),
 		TemperatureTillDate: time.Now(),
 		SensorID:            s.SensorID,
@@ -125,12 +129,12 @@ func (s *DHT22) ReadTemperature(round float64) (*types.Temperature, error) {
 }
 
 // ReadTemperatureWriteIntoChannel and write values into a channel
-func (s *DHT22) ReadTemperatureWriteIntoChannel(round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error, wg *sync.WaitGroup) {
+func (s *DHT22) ReadTemperatureWriteIntoChannel(degree types.Degree, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error, wg *sync.WaitGroup) {
 	if wg != nil {
 		defer wg.Done()
 	}
 
-	temperature, err := s.ReadTemperature(round)
+	temperature, err := s.ReadTemperature(degree, round)
 	if err != nil {
 		errorChannel <- err
 		return
@@ -139,14 +143,14 @@ func (s *DHT22) ReadTemperatureWriteIntoChannel(round float64, temperatureChanne
 }
 
 // ReadTemperatureContinously into a channel until context closed
-func (s *DHT22) ReadTemperatureContinously(ctx context.Context, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error) {
+func (s *DHT22) ReadTemperatureContinously(ctx context.Context, degree types.Degree, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error) {
 	for {
 		select {
 		case <-ctx.Done():
 			errorChannel <- fmt.Errorf("%v: Context closed: %v", s.SensorName, ctx.Err())
 			return
 		default:
-			s.ReadTemperatureWriteIntoChannel(round, temperatureChannel, errorChannel, nil)
+			s.ReadTemperatureWriteIntoChannel(degree, round, temperatureChannel, errorChannel, nil)
 		}
 	}
 }

pkg/sensor/ds18b20.go

@@ -31,7 +31,7 @@ func (s *DS18B20) GetSensor() *types.Sensor {
 }
 
 // ReadTemperature measure the temperature
-func (s *DS18B20) ReadTemperature(round float64) (*types.Temperature, error) {
+func (s *DS18B20) ReadTemperature(degree types.Degree, round float64) (*types.Temperature, error) {
 
 	data, err := ioutil.ReadFile(filepath.Join("/sys/bus/w1/devices", *s.WireID, "/w1_slave"))
 	if err != nil {
@@ -52,6 +52,9 @@ func (s *DS18B20) ReadTemperature(round float64) (*types.Temperature, error) {
 
 	temperatureValue := c / 1000
 
+	// Convert temperature degree
+	temperatureValue = convertTemperatureMeasurementUnit(temperatureValue, types.DegreeCelsius, degree)
+
 	// round
 	if round != 0 {
 		temperatureValue = math.Round(temperatureValue/round) * round
@@ -60,6 +63,7 @@ func (s *DS18B20) ReadTemperature(round float64) (*types.Temperature, error) {
 	temperature := &types.Temperature{
 		TemperatureID:       uuid.NewV4().String(),
 		TemperatureValue:    temperatureValue,
+		TemperatureDegree:   degree,
 		TemperatureFromDate: time.Now(),
 		TemperatureTillDate: time.Now(),
 		SensorID:            s.SensorID,
@@ -70,12 +74,12 @@ func (s *DS18B20) ReadTemperature(round float64) (*types.Temperature, error) {
 }
 
 // ReadTemperatureWriteIntoChannel and write values into a channel
-func (s *DS18B20) ReadTemperatureWriteIntoChannel(round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error, wg *sync.WaitGroup) {
+func (s *DS18B20) ReadTemperatureWriteIntoChannel(degree types.Degree, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error, wg *sync.WaitGroup) {
 	if wg != nil {
 		defer wg.Done()
 	}
 
-	temperature, err := s.ReadTemperature(round)
+	temperature, err := s.ReadTemperature(degree, round)
 	if err != nil {
 		errorChannel <- err
 		return
@@ -84,14 +88,14 @@ func (s *DS18B20) ReadTemperatureWriteIntoChannel(round float64, temperatureChan
 }
 
 // ReadTemperatureContinously into a channel until context closed
-func (s *DS18B20) ReadTemperatureContinously(ctx context.Context, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error) {
+func (s *DS18B20) ReadTemperatureContinously(ctx context.Context, degree types.Degree, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error) {
 	for {
 		select {
 		case <-ctx.Done():
 			errorChannel <- fmt.Errorf("%v: Context closed: %v", s.SensorName, ctx.Err())
 			return
 		default:
-			s.ReadTemperatureWriteIntoChannel(round, temperatureChannel, errorChannel, nil)
+			s.ReadTemperatureWriteIntoChannel(degree, round, temperatureChannel, errorChannel, nil)
 		}
 	}
 }

pkg/sensor/interfaces.go

@@ -18,7 +18,7 @@ type HumiditySensor interface {
 // TemperatureSensor is a interface to describe required functions to measure temperatures
 type TemperatureSensor interface {
 	GetSensorModel() types.SensorModel
-	ReadTemperature(round float64) (*types.Temperature, error)
+	ReadTemperature(degree types.Degree, round float64) (*types.Temperature, error)
-	ReadTemperatureWriteIntoChannel(round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error, wg *sync.WaitGroup)
+	ReadTemperatureWriteIntoChannel(degree types.Degree, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error, wg *sync.WaitGroup)
-	ReadTemperatureContinously(ctx context.Context, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error)
+	ReadTemperatureContinously(ctx context.Context, degree types.Degree, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error)
 }

pkg/sensor/sensor.go

@@ -55,7 +55,7 @@ func ReadHumiditiesContinuously(ctx context.Context, humiditySensors []HumidityS
 }
 
 // ReadTemperatures returns a list of measured temperatures by temperature sensors
-func ReadTemperatures(temperatureSensors []TemperatureSensor, round float64) ([]*types.Temperature, error) {
+func ReadTemperatures(temperatureSensors []TemperatureSensor, degree types.Degree, round float64) ([]*types.Temperature, error) {
 	temperatureChannel := make(chan *types.Temperature, len(temperatureSensors))
 	errorChannel := make(chan error, len(temperatureSensors))
 
@@ -63,7 +63,7 @@ func ReadTemperatures(temperatureSensors []TemperatureSensor, round float64) ([]
 	wg.Add(len(temperatureSensors))
 
 	for _, temperatureSensor := range temperatureSensors {
-		go temperatureSensor.ReadTemperatureWriteIntoChannel(round, temperatureChannel, errorChannel, wg)
+		go temperatureSensor.ReadTemperatureWriteIntoChannel(degree, round, temperatureChannel, errorChannel, wg)
 	}
 
 	wg.Wait()
@@ -79,21 +79,82 @@ func ReadTemperatures(temperatureSensors []TemperatureSensor, round float64) ([]
 }
 
 // ReadTemperaturesWriteIntoChannel reads the temperature values of temperature sensors and writes them into a channel
-func ReadTemperaturesWriteIntoChannel(ctx context.Context, temperatureSensors []TemperatureSensor, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error, wg *sync.WaitGroup) {
+func ReadTemperaturesWriteIntoChannel(ctx context.Context, temperatureSensors []TemperatureSensor, degree types.Degree, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error, wg *sync.WaitGroup) {
 	for _, temperatureSensor := range temperatureSensors {
-		temperatureSensor.ReadTemperatureWriteIntoChannel(round, temperatureChannel, errorChannel, wg)
+		temperatureSensor.ReadTemperatureWriteIntoChannel(degree, round, temperatureChannel, errorChannel, wg)
 	}
 }
 
 // ReadTemperaturesContinuously reads the temperature values of temperature sensors continuously and writes them into a chann
-func ReadTemperaturesContinuously(ctx context.Context, temperatureSensors []TemperatureSensor, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error) {
+func ReadTemperaturesContinuously(ctx context.Context, temperatureSensors []TemperatureSensor, degree types.Degree, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error) {
 	for {
 		select {
 		case <-ctx.Done():
 			errorChannel <- fmt.Errorf("Context closed: %v", ctx.Err())
 			return
 		default:
-			ReadTemperaturesWriteIntoChannel(ctx, temperatureSensors, round, temperatureChannel, errorChannel, nil)
+			ReadTemperaturesWriteIntoChannel(ctx, temperatureSensors, degree, round, temperatureChannel, errorChannel, nil)
 		}
 	}
 }
+
+func convertTemperatureMeasurementUnit(value float64, fromDegree types.Degree, toDegree types.Degree) float64 {
+
+	switch fromDegree {
+	// Celsius
+	case types.DegreeCelsius:
+		switch toDegree {
+		// Celsius -> Celsius
+		case types.DegreeCelsius:
+			return value
+		// Celsius -> Fahrenheit
+		case types.DegreeFahrenheit:
+			return (value * 9 / 5) + 32
+		// Celsius -> Kelvin
+		case types.DegreeKelvin:
+			return value + 273.15
+		}
+
+		// Fahrenheit
+	case types.DegreeFahrenheit:
+		switch toDegree {
+		// Fahrenheit -> Celsius
+		case types.DegreeCelsius:
+			return (value - 32) * 5 / 9
+		// Fahrenheit -> Fahrenheit
+		case types.DegreeFahrenheit:
+			return value
+		// Fahrenheit -> Kelvin
+		case types.DegreeKelvin:
+			return (value-32)*5/9 + 273.15
+		}
+
+	case types.DegreeKelvin:
+		switch toDegree {
+		// Kelvin -> Celsius
+		case types.DegreeCelsius:
+			return value - 273.15
+		// Kelvin -> Fahrenheit
+		case types.DegreeFahrenheit:
+			return (value-273.15)*9/5 + 32
+		// Kevin -> Kelvin
+		case types.DegreeKelvin:
+			return value
+		}
+	}
+
+	return value
+}
+
+func SelectTemperatureMeasurementUnit(unit string) (types.Degree, error) {
+	switch unit {
+	case "celsius":
+		return types.DegreeCelsius, nil
+	case "fahrenheit":
+		return types.DegreeFahrenheit, nil
+	case "kelvin":
+		return types.DegreeKelvin, nil
+	default:
+		return "", fmt.Errorf("Can not determine temperature measurement unit")
+	}
+}

pkg/types/temperature.go

@@ -8,9 +8,24 @@ import (
 type Temperature struct {
 	TemperatureID       string     `json:"temperature_id" xml:"temperature_id"`
 	TemperatureValue    float64    `json:"temperature_value,string" xml:"temperature_value,string"`
+	TemperatureDegree   Degree     `json:"temperature_degree" xml:"temperature_degree"`
 	TemperatureFromDate time.Time  `json:"temperature_from_date" xml:"temperature_from_date"`
 	TemperatureTillDate time.Time  `json:"temperature_till_date" xml:"temperature_till_date"`
 	SensorID            string     `json:"sensor_id" xml:"sensor_id"`
 	CreationDate        *time.Time `json:"creation_date" xml:"creation_date"`
 	UpdateDate          *time.Time `json:"update_date" xml:"update_date"`
 }
+
+// Degree unit of measurement for temperature
+type Degree string
+
+const (
+	// DegreeCelsius indicates the temperature in Celsius
+	DegreeCelsius Degree = "celsius"
+
+	// DegreeFahrenheit indicates the temperature in Fahrenheit
+	DegreeFahrenheit = "fahrenheit"
+
+	// DegreeKelvin indicates the temperature in Kelvin
+	DegreeKelvin = "kelvin"
+)