I am very new to the forums community. I have decided to post this here since I wasn't really able to get enough info on the topic.
I have been doing Astrophotography for a while now, and have actually been able to produce some really good images only with a DSLR and tripod.
But I thought it's time I get a tracker, and since most if not all commercially available ones are out of my pocket, I have seen that Barn door trackers seem to be a really good alternative to that.
I have been studying them for a couple of days now, with there being the single arm version and the double arm barn door tracker. I have so far been able to gather a stepper motor and an arduino since that seemed to be a common electronics setup and some gears and threaded rod.
Seeing that there are a lot of different schematics available for the single arm barn door tracker, I was going to stick to that until I realised that they don't exactly give a long duration (without errors) at higher focal lengths (200mm+).
Bended threaded rod one was my next go to, but then I stumbled upon the benefits of the double arm.
So, I decided to look at the double arm version, and it seems that Dave Trott's type 4 is the way to go. But I feel the plans for building it aren't really out there.
I am seeing, that the most commonly mentioned error is the tangent error, that's eliminated with the double arm version.
My first question, is it possible to eliminate the tangent error on a single arm, with changing the speed of the stepper motor periodically with the help of the arduino (in accordance to the calculations), if so, would it work even better than a double arm that way? [Double arm already seems to be really good]
If not, any help with the dimensions for building the double arm type 4 would be appreciated.
Any other suggestions regarding my next step are appreciated too!
[I am sorry if I am unaware of any of the facts, I am a noob and much of this seems new to me]