microbit: add example showing gpio Button and LED

Signed-off-by: deadprogram <ron@hybridgroup.com>

examples/microbit_io_button.go

@@ -0,0 +1,39 @@
+// +build example
+//
+// Do not build by default.
+
+package main
+
+import (
+	"os"
+
+	"gobot.io/x/gobot"
+	"gobot.io/x/gobot/drivers/gpio"
+	"gobot.io/x/gobot/platforms/ble"
+	"gobot.io/x/gobot/platforms/microbit"
+)
+
+func main() {
+	bleAdaptor := ble.NewClientAdaptor(os.Args[1])
+
+	ubit := microbit.NewIOPinDriver(bleAdaptor)
+	button := gpio.NewButtonDriver(ubit, "0")
+	led := gpio.NewLedDriver(ubit, "1")
+
+	work := func() {
+		button.On(gpio.ButtonPush, func(data interface{}) {
+			led.On()
+		})
+		button.On(gpio.ButtonRelease, func(data interface{}) {
+			led.Off()
+		})
+	}
+
+	robot := gobot.NewRobot("buttonBot",
+		[]gobot.Connection{bleAdaptor, ubit},
+		[]gobot.Device{ubit, button, led},
+		work,
+	)
+
+	robot.Start()
+}