There is no better way to learn robotics and electronics than building and programming your own robots. Cardinaels Rob has shared a guide that shows you how to build a wall climbing robot. You are going to need an Arduino Uno, WiFi module, micro motors, LED strip, and a few other components to get started.
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GECO - Wall climbing robot - Fully open-source
As you can see, the robot moves smoothly on flat surfaces. You can find out more about this project on Instructables.
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