add some more notes

notes.md

@@ -1,7 +1,7 @@
 # Notes
 
 ## Plan
-- [ ] Test speaker without Arduino
+- [x] 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
@@ -13,7 +13,8 @@
 - [ ] 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
+- [x] Figure out how the LCD in the starter kit is programmed
+ - we did this in lab 10 on April 10 and are allowed to use that code
 - [ ] 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)
@@ -49,3 +50,16 @@
   buttons for the pins on the Uno.
  - We can ask same for a shift register.
 - We looked into how to use the LCD display and got some Pseudo code from GPT to help.
+
+## 2024-04-12
+- tested new speaker and it works very well with square waves
+ - so sine waves via Fast PWM+RC filter no longer needs to be done
+- soldered speaker to a solderboard
+
+## 2024-04-13
+- started working on the project's poster
+
+## 2024-04-14
+- since we don't know if we can even get the shift registers on time,
+  it's possible to make our own via another Arduino that has all the buttons
+  connected to it and it sends the data over USART to the speaker Arduino