I am currently trying to build a line follower robot that is designed to solve maze. This maze has a loop, thus it needs to know distance it already travelling (or at least I assume so, please let me know otherwise).
I am aware of a rotary encoder motor from Polulu (for example) but it's not available in my country and shipping price is too expensive.
So I need to find way around it. Should I use Stepper motor? Is there any other way? Thanks in advance.