123 lines
2.9 KiB
Go
123 lines
2.9 KiB
Go
package sensor
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import (
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"context"
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"fmt"
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"log"
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"math"
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"sync"
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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/go-flucky/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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// GetSensorModel returns the sensor model
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func (s *BME280) GetSensorModel() types.SensorModel {
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return s.Sensor.SensorModel
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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.Humidity{
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HumidityID: uuid.NewV4().String(),
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HumidityValue: float64(humidityValue),
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HumidityFromDate: time.Now(),
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HumidityTillDate: time.Now(),
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SensorID: s.SensorID,
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},
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&types.Pressure{
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PressureID: uuid.NewV4().String(),
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PressureValue: pressureValueRound,
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PressureFromDate: time.Now(),
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PressureTillDate: time.Now(),
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SensorID: s.SensorID,
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},
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&types.Temperature{
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TemperatureID: uuid.NewV4().String(),
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TemperatureValue: float64(temperatureValue),
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TemperatureFromDate: time.Now(),
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TemperatureTillDate: time.Now(),
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SensorID: s.SensorID,
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},
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}
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return measuredValues, nil
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}
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// ReadChannel reads the measured values from the sensor and writes them to a
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// channel.
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func (s *BME280) ReadChannel(measuredValuesChannel chan<- []types.MeasuredValue, errorChannel chan<- error, wg *sync.WaitGroup) {
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if wg != nil {
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defer wg.Done()
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}
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measuredValues, err := s.Read()
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if err != nil {
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errorChannel <- err
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return
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}
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measuredValuesChannel <- measuredValues
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}
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// ReadContinously reads the measured values continously from the sensor and
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// writes them to a channel.
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func (s *BME280) ReadContinously(ctx context.Context, measuredValuesChannel chan<- []types.MeasuredValue, errorChannel chan<- error) {
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for {
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select {
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case <-ctx.Done():
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errorChannel <- fmt.Errorf("%v: Context closed: %v", s.SensorName, ctx.Err())
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return
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default:
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s.ReadChannel(measuredValuesChannel, errorChannel, nil)
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}
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}
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}
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