couch_potato

Trying to build a machine that does multiple things: GPS, touch screen, computing, microphone, camera, motor control, wireless internet, etc. Any advice? I've heard Raspberry Pi, Arduino, etc. New to this whole thing...

Thanks. Very cool. I don't think they can latch on to the tracks if in supposed scenario the train is upside down... or will it?

Might seem like a simple question but when I thought about it, I think how the wheels of the train stay on track needs to be elaborated. Sure, if the train travels only in one track, it has a steep extrusion at the middle of the wheel which allow it to stay in track, but... If it crosses another railway, how can we make sure it stays in track? Go here if you don't know what I mean: https://farm3.staticflickr.com/2513/3874671000_349f1f4b18_z.jpg?zz=1 http://static.panoramio.com/photos/large/58668679.jpg

See attached pic. I understand how the R(Thev) was calculated, but I don't know how V(Thev) was calculated? What am I doing wrong?