The idea was having a sensor determine and calibrate de stepper motor on startup of the system. From there all the positions are relative to position (0) the sensor. Works fine but, for the moment, ...

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The project is at an early stage – thus far, laying out how to set up an Arduino Uno using a potentiometer to control the speed of a stepper motor, which rotates the turntable.

There are many ways to use an Arduino on a model railroad. These tiny, inexpensive, programmable computers can perform functions such as controlling signals, routing turnouts, and running animations.

This week’s selection is “More Intermediate Arduino and 3D Print Model Railroad Projects” by Paul and David Bradt.

After that's done, the Arduino moves the device's motors, which in turn move the flashlight. It then shines light upon a miniature cement moon, which shows the phase for the day from the operator ...