digraph blackbox_v1 {
	splines = ortho;
	rankdir = LR;


	node [shape = box, label = "MCU"] mcu;
	node [shape = plaintext, label = "Wireless Adapter"] wireless_adapter;
	node [shape = plaintext, label = "Display"] video;
	node [shape = plaintext, label = "Speaker"] audio;
	node [shape = box, label = "Phone Application"] app;
	

	mcu -> {audio, video};
	wireless_adapter -> mcu;
	app -> wireless_adapter;

}