Model railway turntable

Turntable for model railway. Up to 4 rail stubs or rays can be memorised and manual positioning with a rotary encoder. Servo controlled magnetic uncoupling or wagon braking is incorporated The servo may be omitted.
Arduino controlled. Diagrams show an Arduino pro mini, a Arduino Uno may be substituted. Arduino IDE may be downloaded free and is well documented across the internet.
See files for assembly, parts list and operation.