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Hi Kirthik, I made your project and I am very happy because it works. I would not say that I did not have any difficulties to get it work. I would point out two things: in the sketch there are 4 LEDs, the pictures schow only 3 of them. The other one are the values shown on the serial monitor. They are very different from the ones in the sketch. But you can rewrite them. Maybe one more thing: the buzzer goes on at the max. level, but does not go off at the other levels.Anyway thanks for your work. It is not easy to find videos that really work, or I am still beginner.
Make your own solar powered led string lights. ($5 bucks max)