PKGBUILD/pkg/sensor/dht22.go

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