There is no better way to learn electronics than building your own gadgets using platforms such as Arduino and Raspberry Pi. Star Track by gocivici is a star tracker and pointer powered by Arduino units. It can track any object in the sky.
More gadgets like this: here
Star Track has 3D printed parts. The developer used 2 Arduinos, a gyro, RTC module, and stepper motors to complete this project. More info is available on Instuctables.
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