Added square of fire example

examples/square_fire.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"time"
+
+	"github.com/hybridgroup/gobot"
+	"github.com/hybridgroup/gobot/api"
+	"github.com/hybridgroup/gobot/platforms/gpio"
+	"github.com/hybridgroup/gobot/platforms/intel-iot/edison"
+)
+
+func main() {
+	gbot := gobot.NewGobot()
+	a := api.NewAPI(gbot)
+	a.Start()
+
+	board := edison.NewEdisonAdaptor("edison")
+	red := gpio.NewLedDriver(board, "red", "3")
+	green := gpio.NewLedDriver(board, "green", "5")
+	blue := gpio.NewLedDriver(board, "blue", "6")
+
+	button := gpio.NewButtonDriver(board, "button", "7")
+
+	enabled := true
+	work := func() {
+		red.Brightness(0xff)
+		green.Brightness(0x00)
+		blue.Brightness(0x00)
+
+		flash := false
+		on := true
+
+		gobot.Every(50*time.Millisecond, func() {
+			if enabled {
+				if flash {
+					if on {
+						red.Brightness(0x00)
+						green.Brightness(0xff)
+						blue.Brightness(0x00)
+						on = false
+					} else {
+						red.Brightness(0x00)
+						green.Brightness(0x00)
+						blue.Brightness(0xff)
+						on = true
+					}
+				}
+			}
+		})
+
+		gobot.On(button.Event("push"), func(data interface{}) {
+			flash = true
+		})
+
+		gobot.On(button.Event("release"), func(data interface{}) {
+			flash = false
+			red.Brightness(0x00)
+			green.Brightness(0x00)
+			blue.Brightness(0xff)
+		})
+	}
+
+	robot := gobot.NewRobot(
+		"square of fire",
+		[]gobot.Connection{board},
+		[]gobot.Device{red, green, blue, button},
+		work,
+	)
+
+	robot.AddCommand("enable", func(params map[string]interface{}) interface{} {
+		enabled = !enabled
+		return enabled
+	})
+
+	gbot.AddRobot(robot)
+
+	gbot.Start()
+}