Using Flow Control boxes

Here is an example of the use of 2 Programming > Logic boxes: Counter and Wait For Signals.

Flow Control boxes are very useful when you want to create more complex behaviors.

Create the following behavior: while introducing himself, NAO nods two times, then when both are done, NAO starts to wave.

Step	Action
	Drag and drop a Speech> Creation > Say box. Write NAO‘s introduction sentence (e.g. “Hello I am NAO the little robot and I am ready to serve you, master!”) Connect its input to the main input of the behavior. For further details, see: How to make NAO say something.
	Create a new Timeline box, call it “Nod”. Create a simple nodding movement behavior with its Motion Timeline. Connect its input to the main input of the behavior. For further details, see: How to create a Timeline box and Tutorial about movements.
Test	If you use a real robot, you have to stiffen your robot first. For further details, see: How to wake up your NAO. Click the Play button: NAO nods once and introduces himself.
	Add a Programming > Logic > Counter box to your behavior. Set its Final value parameter to 2. Connect it to your “Nod” box as below (outputs with inputs):
Test	NAO nods two times and talk. It’s not bad but we also want NAO to start waving after he has finished nodding and talking. This is quite simple: a Wait For Signals box should be used.
	Add a Programming > Logic > Wait For Signals box. Connect the onStopped output of Say box to its Signal 1 input and the onStopped output of For to its Signal 2 input. The Wait For Signals box stimulates its output once the two inputs are stimulated.
	Add a Animation > Animation Library > Dialog animations** > Affirmation > NAO > GatherBothHandsInFront_01 box.
Test	NAO starts waving after he has finished nodding and talking!
	As a final exercise, you could create a single box that perform all these actions. For further details, see: How to group several boxes into a single one.