Surfing the Web I came across a blog by a Malaysian amateur astronomer who developed two interesting DIY projects at low cost.
We come to the first, what it calls himself “a star-tracker ultra portable”:
The project is inviting saw the result in astronomical photos and shooting wide, and the project can be consulted at this address: https://nightskyinfocus.com/diyprojects/ultra-portable-tracker-setup/
While the other project that I wanted to tell you is to realise an autoguider using an arduino, but is still under development, this direct link: https://nightskyinfocus.com/diyprojects/diy-autoguider-home-built-autoguider-project/
A project that I got to try although years ago and with less powerful hardware than available currently on the market at low price is iAstrohub, available with either a hardware tvbox and chipsets “Android compatible” which then evolved on platform Rasberry, hence the fork PiAstrohub
IAstrohub page on sourceforge: https://sourceforge.net/projects/iastrohub/
And the link to the main page of http://www.cloudynights.com/topic/385710-piastrohub-raspberrypi version: Rasberry-for-autoguidingdslrgoto/#entry4936734