Decoder to control an elevator (lift) for model trains.
The print includes two micro controllers.
The ATMEGA 328 is used to control two stepper motor drivers (X and Y = left and right). Software is intended to be [GRBL](https://github.com/gnea/grbl/wiki). Limit switches can be connected via two [opto-couplers](https://github.com/gnea/grbl/wiki/Wiring-Limit-Switches).
The ATMEGA 2560 is the main...
To get rid of the many internal wires inside my grbl /driver switch box i decided to develop a complete solution with an arduino nano and optocouplers like shown on https://github.com/gnea/grbl/wiki/Wiring-Limit-Switches.
I want give the OK's a chance because of bad experiences with alarm triggers due electrical static or magnetism from other machines.
Also i plan to make a power distribution bo...
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