package sensor import ( "fmt" "time" "github.com/volker-raschek/flucky/pkg/internal/format" "github.com/volker-raschek/flucky/pkg/types" "github.com/go-flucky/go-dht" uuid "github.com/satori/go.uuid" ) // DHT22 is a sensor to measure humidity and temperature. type DHT22 struct { *types.Sensor } // GetID returns the sensor id func (s *DHT22) GetID() string { return s.ID } // GetTicker returns a new ticker, which tick every when the sensor should be read func (s *DHT22) GetTicker() *time.Ticker { duration, err := time.ParseDuration(s.TickDuration) if err != nil { duration = time.Minute } return time.NewTicker(duration) } // Read measured values func (s *DHT22) Read() ([]*types.MeasuredValue, error) { err := dht.HostInit() if err != nil { return nil, fmt.Errorf("HostInit error: %v", err) } gpio, err := types.GPIOToString(*s.GPIONumber) if err != nil { return nil, err } dht, err := dht.NewDHT(gpio, dht.Celsius, "") if err != nil { return nil, fmt.Errorf("NewDHT error: %v", err) } humidityValue, temperatureValue, err := dht.Read() if err != nil { return nil, fmt.Errorf("Read error: %v", err) } measuredValues := []*types.MeasuredValue{ &types.MeasuredValue{ ID: uuid.NewV4().String(), Value: float64(humidityValue), ValueType: types.MeasuredValueTypeHumidity, FromDate: format.FormatedTime(), TillDate: format.FormatedTime(), SensorID: s.ID, }, &types.MeasuredValue{ ID: uuid.NewV4().String(), Value: float64(temperatureValue), ValueType: types.MeasuredValueTypeTemperature, FromDate: format.FormatedTime(), TillDate: format.FormatedTime(), SensorID: s.ID, }, } return measuredValues, nil }