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