Thanks for the comments, I Thanks for the comments, I am building a big robot too (big compared with this, aprox 10 inchs tall), a cilinder with hands and a lot of optics sensors, I will upload some pics too.
Thanks, it only takes 5 volts of USB port, the port has 4 pins, the external pins are 0 a 5V, you can use it to power a circuit, the circuit must be low current, if not the port maybe burns.