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In the freestyle mode, you can play any song you want. The LED corresponding to the piano key you pressed will light up imediatelly.
In the teaching mode, the LED corresponding to the piano key on which you have to press will light up. If you pressed the correct piano key, the keyboard will move to the next note. Otherwise, all LEDS will change their color to red.
Using the active feedback way of learning (based on the repetition of all the notes learned until then) you will learn the desired song you always wanted.
For this project, I used: