University of Pennsylvania, ESE 5190: Intro to Embedded Systems, Lab 2A

Zeyu Gu
    zeyugu@seas.upenn.edu
Tested on: Lenovo XiaoXinPro 16ACH 2021, Windows 11 21H2

1. Question 3.2 lab 2_3.2.pdf

2. Modeling Decisions Color: 0000 0100 1010 1101 0101 0101 0100 1101

    Modeling response: 
            What basic circuitry does a WS2812 LED need to operate?
   
            Intelligent digital port data latch, signal reshaping amplification drive circuit, precision internal oscillator, 12V voltage programmable constant
            current control.
            
            How do you send a single 1 or 0 bit to the WS2812?
   
            Wide positive pulse for 1, narrow positive pulse for 0, very long negative pulse for latch enable.
            
            How do you tell a WS2812 you’re done sending data?
   
            A long negative pulse latches the pixel data into the LEDs (RESET).
   

3. Refllect

    What were some strengths/weaknesses of working with paper?
   
    Working with paper really makes you focus to understand what is happening from a conceptual level. However, this ends up
    taking a lot of time.
    
    What were some strengths/weaknesses of working with spreadsheets?
   
    Excel can organize a great amount of registers in a clean format. However, it's not convenient to draw.
    
   
    I think the data sheet of 2040 and the data sheet of C SDK are very good sources to understand the data transmission mode and working principle of each       
    register.