poor man's telescope tracker

This is a very cheap telesope tracker with the base components cost less than 10$.
It is made for a EQ-5 mount but can probably be adapted to others.
Part list:
- arduino nano or clone
- stepper motor type 28BYJ-48 incl driver pcb ULN2003
- 200mm closed "GT2" belt
- some sort of power supply (I use a single li-io cell, 3.7V)
- 3 pushbuttons of any size for fast forward, backward, lunar vs stellar speed
- printed parts
- a few screws

I actually drilled a hole into my telescope mount and cut a M4 thread into it to fix the base (see photos). You may want to re-design the base to do this less invasive.
The 16 teeth pulley fits onto the stepper without any screw, the 64 teeth one can be fixed with a screw at the hour-axis drive (see photos). I also used an M4 screw there.

The included little arduino project is made for a 144 teeth main gear as featured on the EQ-5 mount. For other tooth counts, this can be patched.

Electrical connections:
pins 9,10,11,12 from the ardui