105 lines
2.5 KiB
Go
105 lines
2.5 KiB
Go
package gpio
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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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// PIRMotionDriver represents a digital Proximity Infra Red (PIR) motion detecter
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type PIRMotionDriver struct {
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Active bool
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pin string
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name string
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halt chan bool
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interval time.Duration
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connection DigitalReader
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gobot.Eventer
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}
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// NewPIRMotionDriver returns a new PIRMotionDriver with a polling interval of
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// 10 Milliseconds given a DigitalReader and pin.
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//
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// Optionally accepts:
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// time.Duration: Interval at which the PIRMotionDriver is polled for new information
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func NewPIRMotionDriver(a DigitalReader, pin string, v ...time.Duration) *PIRMotionDriver {
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b := &PIRMotionDriver{
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name: gobot.DefaultName("PIRMotion"),
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connection: a,
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pin: pin,
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Active: false,
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Eventer: gobot.NewEventer(),
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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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b.interval = v[0]
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}
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b.AddEvent(MotionDetected)
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b.AddEvent(MotionStopped)
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b.AddEvent(Error)
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return b
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}
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// Start starts the PIRMotionDriver and polls the state of the sensor at the given interval.
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//
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// Emits the Events:
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// MotionDetected - On motion detected
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// MotionStopped int - On motion stopped
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// Error error - On button error
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//
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// The PIRMotionDriver will send the MotionDetected event over and over,
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// just as long as motion is still being detected.
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// It will only send the MotionStopped event once, however, until
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// motion starts being detected again
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func (p *PIRMotionDriver) Start() (err error) {
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go func() {
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for {
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newValue, err := p.connection.DigitalRead(p.Pin())
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if err != nil {
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p.Publish(Error, err)
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}
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switch newValue {
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case 1:
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if !p.Active {
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p.Active = true
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p.Publish(MotionDetected, newValue)
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}
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case 0:
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if p.Active {
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p.Active = false
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p.Publish(MotionStopped, newValue)
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}
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}
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select {
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case <-time.After(p.interval):
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case <-p.halt:
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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 button for new information
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func (p *PIRMotionDriver) Halt() (err error) {
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p.halt <- true
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return
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}
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// Name returns the PIRMotionDriver name
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func (p *PIRMotionDriver) Name() string { return p.name }
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// SetName sets the PIRMotionDriver name
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func (p *PIRMotionDriver) SetName(n string) { p.name = n }
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// Pin returns the PIRMotionDriver pin
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func (p *PIRMotionDriver) Pin() string { return p.pin }
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// Connection returns the PIRMotionDriver Connection
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func (p *PIRMotionDriver) Connection() gobot.Connection { return p.connection.(gobot.Connection) }
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