2019-02-22 12:08:58 +00:00
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package sensor
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import (
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"fmt"
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2019-06-17 21:37:48 +00:00
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"io/ioutil"
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"path/filepath"
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"strconv"
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"strings"
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2020-01-10 18:42:19 +00:00
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"time"
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2019-02-22 12:08:58 +00:00
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2019-08-20 19:37:45 +00:00
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"github.com/go-flucky/flucky/pkg/internal/format"
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2019-06-15 13:58:41 +00:00
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"github.com/go-flucky/flucky/pkg/types"
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2019-02-22 12:08:58 +00:00
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uuid "github.com/satori/go.uuid"
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)
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2019-06-13 19:25:32 +00:00
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// DS18B20 is a sensor to measure humidity and temperature.
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2019-02-22 12:08:58 +00:00
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type DS18B20 struct {
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*types.Sensor
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}
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2020-01-10 21:03:49 +00:00
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// GetID returns the sensor id
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func (s *DS18B20) 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 *DS18B20) 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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2019-06-13 19:25:32 +00:00
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}
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2019-06-25 20:22:34 +00:00
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// Read measured values
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2019-07-02 20:33:01 +00:00
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func (s *DS18B20) Read() ([]*types.MeasuredValue, error) {
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2019-02-22 12:08:58 +00:00
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2019-06-27 07:17:34 +00:00
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if s.WireID == nil {
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2020-01-10 21:03:49 +00:00
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return nil, fmt.Errorf("WireID is not specified for sensor %v", s.Name)
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2019-06-27 07:17:34 +00:00
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}
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2019-06-17 21:37:48 +00:00
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data, err := ioutil.ReadFile(filepath.Join("/sys/bus/w1/devices", *s.WireID, "/w1_slave"))
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2019-02-22 12:08:58 +00:00
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if err != nil {
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2020-01-10 21:03:49 +00:00
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return nil, fmt.Errorf("Can not read data from sensor %v", s.Name)
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2019-06-17 21:37:48 +00:00
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}
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raw := string(data)
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i := strings.LastIndex(raw, "t=")
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if i == -1 {
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2020-01-10 18:42:19 +00:00
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return nil, errorReadData
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2019-06-17 21:37:48 +00:00
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}
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2019-06-18 21:02:11 +00:00
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c, err := strconv.ParseFloat(raw[i+2:len(raw)-1], 64)
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2019-06-17 21:37:48 +00:00
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if err != nil {
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2020-01-10 18:42:19 +00:00
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return nil, errorParseData
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2019-02-22 12:08:58 +00:00
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}
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2019-06-18 21:02:11 +00:00
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temperatureValue := c / 1000
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2019-07-02 20:33:01 +00:00
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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(temperatureValue),
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ValueType: types.MeasuredValueTypeTemperature,
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2019-08-20 19:37:45 +00:00
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FromDate: format.FormatedTime(),
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TillDate: format.FormatedTime(),
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2020-01-10 21:03:49 +00:00
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SensorID: s.ID,
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2019-06-25 20:22:34 +00:00
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},
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2019-02-22 12:08:58 +00:00
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}
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2019-06-25 20:22:34 +00:00
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return measuredValues, nil
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2020-01-10 18:42:19 +00:00
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}
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