PKGBUILD/pkg/sensor/dht22.go

76 lines
1.7 KiB
Go

package sensor
import (
"fmt"
"time"
"github.com/go-flucky/flucky/pkg/internal/format"
"github.com/go-flucky/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
}