PKGBUILD/pkg/sensor/bme280.go

101 lines
2.4 KiB
Go

package sensor
import (
"log"
"time"
"github.com/d2r2/go-bsbmp"
"github.com/d2r2/go-i2c"
"github.com/d2r2/go-logger"
"github.com/volker-raschek/flucky/pkg/internal/format"
"github.com/volker-raschek/flucky/pkg/types"
uuid "github.com/satori/go.uuid"
)
// BME280 is a sensor to measure humidity and temperature.
type BME280 struct {
*types.Sensor
}
// GetID returns the sensor id
func (s *BME280) GetID() string {
return s.ID
}
// GetTicker returns a new ticker, which tick every when the sensor should be read
func (s *BME280) GetTicker() *time.Ticker {
duration, err := time.ParseDuration(s.TickDuration)
if err != nil {
duration = time.Minute
}
return time.NewTicker(duration)
}
// Read measured values
func (s *BME280) Read() ([]*types.MeasuredValue, error) {
// Create new connection to i2c-bus on 1 line with address 0x76.
// Use i2cdetect utility to find device address over the i2c-bus
i2c, err := i2c.NewI2C(*s.I2CAddress, *s.I2CBus)
if err != nil {
log.Fatal(err)
}
defer i2c.Close()
logger.ChangePackageLogLevel("i2c", logger.InfoLevel)
sensor, err := bsbmp.NewBMP(bsbmp.BME280, i2c)
if err != nil {
log.Fatal(err)
}
logger.ChangePackageLogLevel("bsbmp", logger.InfoLevel)
temperatureValue, err := sensor.ReadTemperatureC(bsbmp.ACCURACY_STANDARD)
if err != nil {
log.Fatal(err)
}
pressureValue, err := sensor.ReadPressurePa(bsbmp.ACCURACY_STANDARD)
if err != nil {
log.Fatal(err)
}
// pressureValueRound := math.Round(float64(pressureValue)/10*0.25) * 10 / 0.25
_, humidityValue, err := sensor.ReadHumidityRH(bsbmp.ACCURACY_STANDARD)
if err != nil {
log.Fatal(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(pressureValue),
ValueType: types.MeasuredValueTypePressure,
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
}