PKGBUILD/pkg/sensor/dht22.go

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package sensor
import (
"context"
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"fmt"
"math"
"sync"
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"time"
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"github.com/go-flucky/flucky/pkg/types"
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"github.com/go-flucky/go-dht"
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uuid "github.com/satori/go.uuid"
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)
// DHT22 is a sensor to measure humidity and temperature.
type DHT22 struct {
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*types.Sensor
}
// GetSensorModel returns the sensor model
func (s *DHT22) GetSensorModel() types.SensorModel {
return s.Sensor.SensorModel
}
// ReadHumidity measure the humidity
func (s *DHT22) ReadHumidity(round float64) (*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)
}
if round != 0 {
humidityValue = math.Round(humidityValue/round) * round
}
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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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}
// ReadHumidityWriteIntoChannel and write values into a channel
func (s *DHT22) ReadHumidityWriteIntoChannel(round float64, humidityChannel chan<- *types.Humidity, errorChannel chan<- error, wg *sync.WaitGroup) {
if wg != nil {
defer wg.Done()
}
humidity, err := s.ReadHumidity(round)
if err != nil {
errorChannel <- err
return
}
humidityChannel <- humidity
}
// ReadHumidityContinously into a channel until context closed
func (s *DHT22) ReadHumidityContinously(ctx context.Context, round float64, humidityChannel chan<- *types.Humidity, errorChannel chan<- error) {
for {
select {
case <-ctx.Done():
errorChannel <- fmt.Errorf("%v: Context closed: %v", s.SensorName, ctx.Err())
return
default:
s.ReadHumidityWriteIntoChannel(round, humidityChannel, errorChannel, nil)
}
}
}
// ReadTemperature measure the temperature
func (s *DHT22) ReadTemperature(degree types.Degree, round float64) (*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)
}
// Convert temperature degree
temperatureValue = convertTemperatureMeasurementUnit(temperatureValue, types.DegreeCelsius, degree)
// round
if round != 0 {
temperatureValue = math.Round(temperatureValue/round) * round
}
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temperature := &types.Temperature{
TemperatureID: uuid.NewV4().String(),
TemperatureValue: temperatureValue,
TemperatureDegree: degree,
TemperatureFromDate: time.Now(),
TemperatureTillDate: time.Now(),
SensorID: s.SensorID,
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}
return temperature, nil
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}
// ReadTemperatureWriteIntoChannel and write values into a channel
func (s *DHT22) ReadTemperatureWriteIntoChannel(degree types.Degree, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error, wg *sync.WaitGroup) {
if wg != nil {
defer wg.Done()
}
temperature, err := s.ReadTemperature(degree, round)
if err != nil {
errorChannel <- err
return
}
temperatureChannel <- temperature
}
// ReadTemperatureContinously into a channel until context closed
func (s *DHT22) ReadTemperatureContinously(ctx context.Context, degree types.Degree, round float64, temperatureChannel chan<- *types.Temperature, errorChannel chan<- error) {
for {
select {
case <-ctx.Done():
errorChannel <- fmt.Errorf("%v: Context closed: %v", s.SensorName, ctx.Err())
return
default:
s.ReadTemperatureWriteIntoChannel(degree, round, temperatureChannel, errorChannel, nil)
}
}
}