@Serac, @fruitloaf – Thank you for your help and for sharing this informations!
To clarify:
- there is a single 12V DC motor
- there is a single rotation direction that we want to control the motor

I will meet this evening with my coleagues and will follow soon with our progress

Hello, We are a group of students working at a new project. A blessed soul has donated us 120 $ that we intend to use to buy 4 Raspberry Pi. What we want is, first, to find out if we can control a 12V DC motor connecting the RbP directly to it (if possible) and second if an app, for Android OS, can ...