FergusInLondon / ELK-BLEDOM

Go package for interacting with the "ELK" Bluetooth Low Energy RGB LED Controller

Go interactions for the ELK-BLEDOM RGB LED Controller

This repository contains information on the common (and cheap) ELK-BLEDOM Bluetooth Low Energy RGB LED controller, as well as a Go package for interacting with it.

Bluetooth interactions have been reverse engineered from the Android app. See PROTOCOL.md for more information on both the hardware and how it can be controlled.

Example

func main() {
	ctx, cancel := context.WithCancel(context.Background())
	d := device.NewBleDomRGBController(ctx, device.Options{})

	if err := d.Connect(time.Duration(time.Minute)); err != nil {
		panic(err)
	}

	gracefulTermination(cancel, d)

	// Don't terminate until device has been cleanly shutdown
	defer func() {
		fmt.Println("waiting for device disconnection")
		d.Done()
		fmt.Println("device disconnected: terminating app")
	}()

	// Configure state polling; retrieve state every 30 seconds and log
	// it to stdout.
	d.PollState(time.Duration(30)*time.Second, func(state []byte) {
		fmt.Println("recieved latest state from device", state)
	})

	fmt.Println("setting brightness to maximum")
	d.WriteCommand(device.BrightnessCommandFromValue(96)) // 96%

	i := 1
	t := time.NewTimer(time.Second)
	for {
		select {
		case <-ctx.Done():
			fmt.Println("context cancelled: stopping commands")
			t.Stop()
			return
		case <-t.C:
			cmd := commands[i%len(commands)]
			fmt.Println("changing colour: ", cmd.Red, cmd.Green, cmd.Blue)
			d.WriteCommand(cmd)

			i = i + 1
			t.Reset(time.Second)
		}
	}
}

See colours.go.