I'm gonna build a 3d printed rollercoaster! The idea is that the train rides on the track based on an arduino nano, with smartphone control through bluetooth. The problem is that I'm very new to arduino, I found some tutorials from a arduino uno, but the train must be so compact as possible! Can someone help me out? It only has to have 1 dc motor beacuse the only way is forward and no steering because it follows the track.