I am in the process of thinkering about making an home made equatorial mount to take deep sky images.
An equatorial mount is basically a 4 axis motorized things in which only one axis moves to compensate the movement of the earth. To achieve it the motor should move smoothly and constantly at a very low speed (around 15 degrees per hour).
My camera + telescope weight approximately 2kg but I would like to make a solution that can handle 5kg without problems (in case of future upgrades). Based on my actual design the distance between the motor mount and telescope is ~8cm with a gear ratio between pulley #1 and #2 of around ~4. I am planning to operate it at 12/24V.
I have a few experiences with steppers but unfortunately I have never used a DC motor (with Arduino).
As we know steppers motors moves with steps so from a logical point of view they have already lost at the beginning in this case but using reduction gears they can actually be used (and they are used by other DIY and some commercial equipment).
At the beginning I was going to use the 17HS4401 stepper, which has these characteristics:
I would have used it with a worm gear without microstepping
Then I have been tempted by DC motor with/without encoder.
As driver a fast search brought me to the L298N which can control 2 motors and is very cheap, or the DRV8838 and TB6612.
I am opening this topic because I would like to receive a few suggestions and discuss which kind of motor to use: DC vs stepper motor.
Please feel free to share your thoughts