Nao tutorial 1: First steps
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The purpose of this tutorial is to teach you the basic concepts of Nao. I assume that you are staring at the robot's box after (hopefully) buying it, and that you want to start making cool things with it, like conquering the world. You are wondering how to do that, but you don't even know how to plug the robot.
I will take you, step by step, through the first tasks that you should complete before going serious. Even if I will try to make it easy, certain previous knowledge is required, like basic programming and Linux concepts. Also, I would recommend you to read the official documentation and tutorials found here (section "Software") before going forth. In case of doubt, always trust them.
This tutorial is targeted for version 1.10.10 of the SDK and OS. Older versions like 1.8.16 or 1.6.13 will probably not work.
Putting everything ready
OK, the first thing you must do is to get a testing environment ready. By "testing environment" I mean a room with enough space, a computer running Linux (Debian or Ubuntu preferably), a network LAN connection with a router, and such. Be aware that Nao is very prone to fall if you do something wrong. Don't be afraid, but keep it in mind.
Place Nao somewhere in the middle of the room, so he has freedom of movement. Try to keep it apart from places or objects that could make him fall or get jammed. Also, note that you will need to plug it to the power this time (or whenever you need to recharge his battery), and to the LAN. The power connector is on Nao's back, facing downwards. In fact, you will be plugging it directly to the battery, which is behind the cover (it has 4 screws that you must remove in order to access it).
Finally, the Ethernet socket is behind the head. You may need to open the protective hatch, or completely remove the head's cover, whichever one you prefer.
Getting to know Nao
When everything is set, press Nao's chest button once to turn it on. His eyes will start blinking red, green and blue. Then, some other blue LEDs located on his ears will do the same, and the eyes will stop blinking. Later, the eyes and chest button will come alive again with a stable white light, and the robot will tell you that it has finished loading his system. The whole process lasts about two minutes and you will get soon tired of it, I promise.
If you plugged Nao to your LAN via Ethernet, he should have gotten an IP address by now, using DHCP.