PKGBUILD/pkg/sensor/bme280.go

91 lines
2.0 KiB
Go

package sensor
import (
"fmt"
"sync"
"github.com/d2r2/go-bsbmp"
"github.com/d2r2/go-i2c"
"github.com/d2r2/go-logger"
uuid "github.com/satori/go.uuid"
"git.cryptic.systems/volker.raschek/flucky/pkg/internal/format"
"git.cryptic.systems/volker.raschek/flucky/pkg/types"
)
// BME280 is a sensor to measure humidity and temperature.
type BME280 struct {
*types.Sensor
mutex *sync.Mutex
}
// Read measured values
func (bme280 *BME280) Read() ([]*types.MeasuredValue, error) {
// Lock multiple access
bme280.mutex.Lock()
defer bme280.mutex.Unlock()
// 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(*bme280.I2CAddress, *bme280.I2CBus)
if err != nil {
return nil, err
}
defer i2c.Close()
// Reduce loglevel
for _, pkg := range []string{"bsbmp", "i2c"} {
err = logger.ChangePackageLogLevel(pkg, logger.InfoLevel)
if err != nil {
return nil, fmt.Errorf("Failed to change package log level: %v", err)
}
}
sensor, err := bsbmp.NewBMP(bsbmp.BME280, i2c)
if err != nil {
return nil, err
}
temperatureValue, err := sensor.ReadTemperatureC(bsbmp.ACCURACY_STANDARD)
if err != nil {
return nil, err
}
pressureValue, err := sensor.ReadPressurePa(bsbmp.ACCURACY_STANDARD)
if err != nil {
return nil, err
}
_, humidityValue, err := sensor.ReadHumidityRH(bsbmp.ACCURACY_STANDARD)
if err != nil {
return nil, err
}
measuredValues := []*types.MeasuredValue{
{
ID: uuid.NewV4().String(),
Value: float64(humidityValue),
ValueType: "humidity",
Date: format.FormatedTime(),
SensorID: bme280.ID,
},
{
ID: uuid.NewV4().String(),
Value: float64(pressureValue),
ValueType: "pressure",
Date: format.FormatedTime(),
SensorID: bme280.ID,
},
{
ID: uuid.NewV4().String(),
Value: float64(temperatureValue),
ValueType: "temperature",
Date: format.FormatedTime(),
SensorID: bme280.ID,
},
}
return measuredValues, nil
}