PKGBUILD/pkg/sensor/dht22.go

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package sensor
import (
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"fmt"
"time"
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"github.com/MichaelS11/go-dht"
uuid "github.com/satori/go.uuid"
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"github.com/volker-raschek/flucky/pkg/types"
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)
// DHT22 is a sensor to measure humidity and temperature.
type DHT22 struct {
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*types.Sensor
}
// GetEnabled returns a boolen if the sensor is enabled or disabled
func (s *DHT22) GetEnabled() bool {
return s.SensorEnabled
}
// GetSensorModel returns the sensor model
func (s *DHT22) GetSensorModel() types.SensorModel {
return s.Sensor.SensorModel
}
// ReadHumidity measure the humidity
func (s *DHT22) ReadHumidity() (*types.Humidity, error) {
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err := dht.HostInit()
if err != nil {
return nil, fmt.Errorf("HostInit error: %v", err)
}
gpio, err := types.GPIOToString(*s.GPIONumber)
if err != nil {
return nil, err
}
dht, err := dht.NewDHT(gpio, dht.Celsius, "")
if err != nil {
return nil, fmt.Errorf("NewDHT error: %v", err)
}
humidityValue, _, err := dht.Read()
if err != nil {
return nil, fmt.Errorf("Read error: %v", err)
}
humidity := &types.Humidity{
HumidityID: uuid.NewV4().String(),
HumidityValue: humidityValue,
HumidityFromDate: time.Now(),
HumidityTillDate: time.Now(),
SensorID: s.SensorID,
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}
return humidity, nil
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}
// ReadTemperature measure the temperature
func (s *DHT22) ReadTemperature() (*types.Temperature, error) {
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err := dht.HostInit()
if err != nil {
return nil, fmt.Errorf("HostInit error: %v", err)
}
gpio, err := types.GPIOToString(*s.GPIONumber)
if err != nil {
return nil, err
}
dht, err := dht.NewDHT(gpio, dht.Celsius, "")
if err != nil {
return nil, fmt.Errorf("NewDHT error: %v", err)
}
_, temperatureValue, err := dht.Read()
if err != nil {
return nil, fmt.Errorf("Read error: %v", err)
}
temperature := &types.Temperature{
TemperatureID: uuid.NewV4().String(),
TemperatureValue: temperatureValue,
TemperatureFromDate: time.Now(),
TemperatureTillDate: time.Now(),
SensorID: s.SensorID,
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}
return temperature, nil
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}