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package gpio
import "gobot.io/x/gobot"
// RelayDriver represents a digital relay
type RelayDriver struct {
pin string
name string
connection DigitalWriter
high bool
Inverted bool
gobot.Commander
}
// NewRelayDriver return a new RelayDriver given a DigitalWriter and pin.
//
// Adds the following API Commands:
// "Toggle" - See RelayDriver.Toggle
// "On" - See RelayDriver.On
// "Off" - See RelayDriver.Off
func NewRelayDriver(a DigitalWriter, pin string) *RelayDriver {
l := &RelayDriver{
name: gobot.DefaultName("Relay"),
pin: pin,
connection: a,
high: false,
Inverted: false,
Commander: gobot.NewCommander(),
}
l.AddCommand("Toggle", func(params map[string]interface{}) interface{} {
return l.Toggle()
})
l.AddCommand("On", func(params map[string]interface{}) interface{} {
return l.On()
})
l.AddCommand("Off", func(params map[string]interface{}) interface{} {
return l.Off()
})
return l
}
// Start implements the Driver interface
func (l *RelayDriver) Start() (err error) { return }
// Halt implements the Driver interface
func (l *RelayDriver) Halt() (err error) { return }
// Name returns the RelayDrivers name
func (l *RelayDriver) Name() string { return l.name }
// SetName sets the RelayDrivers name
func (l *RelayDriver) SetName(n string) { l.name = n }
// Pin returns the RelayDrivers name
func (l *RelayDriver) Pin() string { return l.pin }
// Connection returns the RelayDrivers Connection
func (l *RelayDriver) Connection() gobot.Connection {
return l.connection.(gobot.Connection)
}
// State return true if the relay is On and false if the relay is Off
func (l *RelayDriver) State() bool {
if l.Inverted {
return !l.high
}
return l.high
}
// On sets the relay to a high state.
func (l *RelayDriver) On() (err error) {
if err = l.connection.DigitalWrite(l.Pin(), 1); err != nil {
return
}
if l.Inverted {
l.high = false
} else {
l.high = true
}
return
}
// Off sets the relay to a low state.
func (l *RelayDriver) Off() (err error) {
if err = l.connection.DigitalWrite(l.Pin(), 0); err != nil {
return
}
if l.Inverted {
l.high = true
} else {
l.high = false
}
return
}
// Toggle sets the relay to the opposite of it's current state
func (l *RelayDriver) Toggle() (err error) {
if l.State() {
err = l.Off()
} else {
err = l.On()
}
return
}
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