Add buzzer example

examples/firmata_buzzer.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"time"
+
+	"github.com/hybridgroup/gobot"
+	"github.com/hybridgroup/gobot/platforms/firmata"
+	"github.com/hybridgroup/gobot/platforms/gpio"
+)
+
+func main() {
+	gbot := gobot.NewGobot()
+
+	firmataAdaptor := firmata.NewFirmataAdaptor("arduino", "/dev/ttyACM0")
+	buzzer := gpio.NewBuzzerDriver(firmataAdaptor, "buzzer", "3")
+
+	work := func() {
+		type note struct {
+			tone     float64
+			duration float64
+		}
+
+		song := []note{
+			{gpio.C4, gpio.Quarter},
+			{gpio.C4, gpio.Quarter},
+			{gpio.G4, gpio.Quarter},
+			{gpio.G4, gpio.Quarter},
+			{gpio.A4, gpio.Quarter},
+			{gpio.A4, gpio.Quarter},
+			{gpio.G4, gpio.Half},
+			{gpio.F4, gpio.Quarter},
+			{gpio.F4, gpio.Quarter},
+			{gpio.E4, gpio.Quarter},
+			{gpio.E4, gpio.Quarter},
+			{gpio.D4, gpio.Quarter},
+			{gpio.D4, gpio.Quarter},
+			{gpio.C4, gpio.Half},
+		}
+
+		for _, val := range song {
+			buzzer.Tone(val.tone, val.duration)
+			<-time.After(10 * time.Millisecond)
+		}
+	}
+
+	robot := gobot.NewRobot("bot",
+		[]gobot.Connection{firmataAdaptor},
+		[]gobot.Device{buzzer},
+		work,
+	)
+
+	gbot.AddRobot(robot)
+
+	gbot.Start()
+}