106 lines
2.7 KiB
Go
106 lines
2.7 KiB
Go
package aio
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import (
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"time"
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"gobot.io/x/gobot"
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)
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// AnalogSensorDriver represents an Analog Sensor
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type AnalogSensorDriver struct {
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name string
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pin string
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halt chan bool
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interval time.Duration
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connection AnalogReader
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gobot.Eventer
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gobot.Commander
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}
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// NewAnalogSensorDriver returns a new AnalogSensorDriver with a polling interval of
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// 10 Milliseconds given an AnalogReader and pin.
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//
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// Optionally accepts:
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// time.Duration: Interval at which the AnalogSensor is polled for new information
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//
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// Adds the following API Commands:
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// "Read" - See AnalogSensor.Read
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func NewAnalogSensorDriver(a AnalogReader, pin string, v ...time.Duration) *AnalogSensorDriver {
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d := &AnalogSensorDriver{
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name: gobot.DefaultName("AnalogSensor"),
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connection: a,
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pin: pin,
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Eventer: gobot.NewEventer(),
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Commander: gobot.NewCommander(),
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interval: 10 * time.Millisecond,
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halt: make(chan bool),
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}
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if len(v) > 0 {
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d.interval = v[0]
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}
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d.AddEvent(Data)
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d.AddEvent(Error)
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d.AddCommand("Read", func(params map[string]interface{}) interface{} {
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val, err := d.Read()
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return map[string]interface{}{"val": val, "err": err}
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})
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return d
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}
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// Start starts the AnalogSensorDriver and reads the Analog Sensor at the given interval.
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// Emits the Events:
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// Data int - Event is emitted on change and represents the current reading from the sensor.
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// Error error - Event is emitted on error reading from the sensor.
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func (a *AnalogSensorDriver) Start() (err error) {
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var value int = 0
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go func() {
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timer := time.NewTimer(a.interval)
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timer.Stop()
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for {
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newValue, err := a.Read()
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if err != nil {
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a.Publish(a.Event(Error), err)
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} else if newValue != value && newValue != -1 {
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value = newValue
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a.Publish(a.Event(Data), value)
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}
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timer.Reset(a.interval)
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select {
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case <-timer.C:
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case <-a.halt:
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timer.Stop()
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return
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}
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}
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}()
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return
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}
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// Halt stops polling the analog sensor for new information
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func (a *AnalogSensorDriver) Halt() (err error) {
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a.halt <- true
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return
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}
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// Name returns the AnalogSensorDrivers name
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func (a *AnalogSensorDriver) Name() string { return a.name }
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// SetName sets the AnalogSensorDrivers name
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func (a *AnalogSensorDriver) SetName(n string) { a.name = n }
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// Pin returns the AnalogSensorDrivers pin
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func (a *AnalogSensorDriver) Pin() string { return a.pin }
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// Connection returns the AnalogSensorDrivers Connection
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func (a *AnalogSensorDriver) Connection() gobot.Connection { return a.connection.(gobot.Connection) }
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// Read returns the current reading from the Analog Sensor
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func (a *AnalogSensorDriver) Read() (val int, err error) {
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return a.connection.AnalogRead(a.Pin())
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}
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