Hi,
thanks for reply&help.
The motor is the same as in the headline. The driver board is a ULN2003 based tiny board (with 4 red leds), got in bundle from dx.com.
The power supply is a 240V AC/12V DC at 2A with stabilizer 7809 for the Nano and 7805 for the motor driver board. I guess it should be enough.
There should be 2 different speed values for the 2 directions.
The project has to have enough torque in the slow motion phase to run smooth with a camera on it and fast enough if parking back after exposure.
The motor is connected with a belt drive to the curved rod in order to avoid backlash btw. gears. The gear on the rod has to turn exactly with 1 RPM.
Just for information how a barn door tracker is looking like, here's an example (not mine): LINK
Thanks and regards:
Frigyes