package sensor import ( "fmt" "time" "github.com/MichaelS11/go-dht" uuid "github.com/satori/go.uuid" "github.com/volker-raschek/flucky/pkg/types" ) // DHT22 is a sensor to measure humidity and temperature. type DHT22 struct { *types.Sensor } // GetSensorModel returns the sensor model func (s *DHT22) GetSensorModel() types.SensorModel { return s.Sensor.SensorModel } // ReadHumidity measure the humidity func (s *DHT22) ReadHumidity() (*types.Humidity, 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, _, err := dht.Read() if err != nil { return nil, fmt.Errorf("Read error: %v", err) } humidity := &types.Humidity{ HumidityID: uuid.NewV4().String(), HumidityValue: humidityValue, HumidityFromDate: time.Now(), HumidityTillDate: time.Now(), SensorID: s.SensorID, } return humidity, nil } // ReadTemperature measure the temperature func (s *DHT22) ReadTemperature() (*types.Temperature, 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) } _, temperatureValue, err := dht.Read() if err != nil { return nil, fmt.Errorf("Read error: %v", err) } temperature := &types.Temperature{ TemperatureID: uuid.NewV4().String(), TemperatureValue: temperatureValue, TemperatureFromDate: time.Now(), TemperatureTillDate: time.Now(), SensorID: s.SensorID, } return temperature, nil }