Actually I am working on the electronics, which will control the stepper. As the "barn door" parts will be ready this weekend, the electronics should at least be able to drive it for a quick test.

A Finite State Machine will be used to control the whole thing. Two push buttons should allow enough interaction. These states are implemented:

• Init (initialisation and homing the barn)
• Manual mode
  • Manual up
  • Manual down
• Automatic mode
• Automatic up (tracking mode)
• Automatic down (homing the barn)

Pressing both buttons simultaneously will switch between auto and manual mode. Pressing one of the buttons will either move the barn up or down. Below you find a quick snap of my (really messy) workbench.