add notes from 2024-03-28 meeting

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+# Notes
+
+## Plan
+- [ ] Test speaker without Arduino
+ - can be done by using a function generator and 3.3V square wave
+   with variable frequency
+- [ ] Write AVR C code to generate a square wave of varying frequency
+   via Timer1
+ - Timer1 is used so that a pre-scalar and its calculations don't
+   need to be done
+- [ ] Use a table/array that stores frequencies and the indices correspond to
+   the buttons on the sound board
+- [ ] Create buffers to add recording/saving/playing functionality
+ - the buffers are a sequence of notes (which are the indices of the previous
+   table) that is terminated by some other byte
+- [ ] Figure out how the LCD in the starter kit is programmed
+- [ ] Show the current and surrounding notes in the currently selected buffer
+   (or the note of the soundboard button that was just pressed)
+- [ ] Add a menu on the second row to select the memory buffer (maybe 1-5)
+ - it is controlled by left and right buttons
+
+## 2024-03-28
+![](2024-03-28_notes.jpg)