package sensor import ( "fmt" "sync" "github.com/go-flucky/go-dht" uuid "github.com/satori/go.uuid" "github.com/volker-raschek/flucky/pkg/internal/format" "github.com/volker-raschek/flucky/pkg/types" ) // DHT22 is a sensor to measure humidity and temperature. type DHT22 struct { *types.Sensor mutex *sync.Mutex } // Read measured values func (dht22 *DHT22) Read() ([]*types.MeasuredValue, error) { // Lock multiple access dht22.mutex.Lock() defer dht22.mutex.Unlock() err := dht.HostInit() if err != nil { return nil, fmt.Errorf("Failed to initialize periph: %v", err) } dht, err := dht.NewDHT(dht22.GPIONumber, dht.Celsius, "") if err != nil { return nil, fmt.Errorf("Failed to initialize new DHT22 sensor: %v", err) } humidityValue, temperatureValue, err := dht.Read() if err != nil { return nil, fmt.Errorf("Read error: %v", err) } measuredValues := []*types.MeasuredValue{ { ID: uuid.NewV4().String(), Value: float64(humidityValue), ValueType: "humidity", FromDate: format.FormatedTime(), TillDate: format.FormatedTime(), SensorID: dht22.ID, }, { ID: uuid.NewV4().String(), Value: float64(temperatureValue), ValueType: "temperature", FromDate: format.FormatedTime(), TillDate: format.FormatedTime(), SensorID: dht22.ID, }, } return measuredValues, nil }