for my final project , I want to make a seperation unit, which one I can throw things into it and seperate them by itself.Because of the time is short , so I have to make an easier one, which can seperate different kind of coins.

I choose the photo senser and a LED to recogenize what kind of coin it is, also use the value that the senser get to set the joystick left or right.

I use the 3d printer to make the joystick.