25w13 Make Musical Note Using Buzzer with Arduino

We continue PJ021: Make Music Box with the Buzzer and Arduino, and starting from this session, we make musical notes using the buzzer, this is challenging, because the students need to understand a little about the musical theory and the formula to calculate the note pitch & duration, we have provided good instruction on the webpage, and starting from this time, we leave some "FIX ME" holes in the example codes, so that the students have to think hard to fix the faults and debug the result until working correctly, this is fun and very helpful! Oh, we find that a few students also quietly use AI tool to help fixing the code errors, we don't know what to guide at the moment, but we don't oppose this method, let's see how the new technologies affects our traditional learning activities.