SECOND VERSION
The Ranger, with the help of the Potentiometer, will act as a fan, and can switch it on and off, as well as regulate the speed.
The Makeblock fan, like most Arduino binary engines, only has two states, switch on and off, and it is not possible to regulate the speed. However, it can regulate at regular intervals of time, determined with the potentiometer, stop for a brief moment the engine, we will manage to regulate its speed accurately.
To make the activity more attractive, we have incorporated an ultrasonic sensor that when you put your hand or other object near it, the engines of the Ranger wheels will activate, which will start to rotate as if it were a standing fan.
