101 lines
2.4 KiB
Go
101 lines
2.4 KiB
Go
package sensor
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import (
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"log"
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"time"
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"github.com/d2r2/go-bsbmp"
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"github.com/d2r2/go-i2c"
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"github.com/d2r2/go-logger"
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"github.com/volker-raschek/flucky/pkg/internal/format"
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"github.com/volker-raschek/flucky/pkg/types"
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uuid "github.com/satori/go.uuid"
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)
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// BME280 is a sensor to measure humidity and temperature.
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type BME280 struct {
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*types.Sensor
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}
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// GetID returns the sensor id
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func (s *BME280) GetID() string {
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return s.ID
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}
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// GetTicker returns a new ticker, which tick every when the sensor should be read
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func (s *BME280) GetTicker() *time.Ticker {
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duration, err := time.ParseDuration(s.TickDuration)
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if err != nil {
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duration = time.Minute
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}
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return time.NewTicker(duration)
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}
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// Read measured values
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func (s *BME280) Read() ([]*types.MeasuredValue, error) {
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// Create new connection to i2c-bus on 1 line with address 0x76.
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// Use i2cdetect utility to find device address over the i2c-bus
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i2c, err := i2c.NewI2C(*s.I2CAddress, *s.I2CBus)
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if err != nil {
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log.Fatal(err)
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}
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defer i2c.Close()
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logger.ChangePackageLogLevel("i2c", logger.InfoLevel)
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sensor, err := bsbmp.NewBMP(bsbmp.BME280, i2c)
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if err != nil {
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log.Fatal(err)
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}
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logger.ChangePackageLogLevel("bsbmp", logger.InfoLevel)
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temperatureValue, err := sensor.ReadTemperatureC(bsbmp.ACCURACY_STANDARD)
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if err != nil {
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log.Fatal(err)
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}
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pressureValue, err := sensor.ReadPressurePa(bsbmp.ACCURACY_STANDARD)
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if err != nil {
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log.Fatal(err)
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}
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// pressureValueRound := math.Round(float64(pressureValue)/10*0.25) * 10 / 0.25
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_, humidityValue, err := sensor.ReadHumidityRH(bsbmp.ACCURACY_STANDARD)
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if err != nil {
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log.Fatal(err)
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}
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measuredValues := []*types.MeasuredValue{
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&types.MeasuredValue{
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ID: uuid.NewV4().String(),
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Value: float64(humidityValue),
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ValueType: types.MeasuredValueTypeHumidity,
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FromDate: format.FormatedTime(),
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TillDate: format.FormatedTime(),
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SensorID: s.ID,
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},
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&types.MeasuredValue{
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ID: uuid.NewV4().String(),
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Value: float64(pressureValue),
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ValueType: types.MeasuredValueTypePressure,
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FromDate: format.FormatedTime(),
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TillDate: format.FormatedTime(),
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SensorID: s.ID,
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},
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&types.MeasuredValue{
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ID: uuid.NewV4().String(),
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Value: float64(temperatureValue),
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ValueType: types.MeasuredValueTypeTemperature,
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FromDate: format.FormatedTime(),
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TillDate: format.FormatedTime(),
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SensorID: s.ID,
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},
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}
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return measuredValues, nil
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}
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