Try building your own Arduino Sunflower (solar tracking) step by step, suitable for beginners.
I watched a video, in which the sunflower moves along with the sun. I had a sudden insight then. Why can't I make a electronic device inmitating this biomechanism. So I began to carry out my solar tracker project. At last, I tested with the LED on my phone. It worked perfectly.
I was so excited and posted the demo video on the social media. I was surprised that many people liked and shared this video, and some of them even sent me messages saying that they want to make this projects too.
So I redid this projects and make a specific tutorial to let more people make this project.