PROJECT: Press The Button (PTB2)

Buttons and multi-colored LEDs, oh my!

Do note, the productive way to go about this project involves taking the following steps:

• starting early
• reading the project page
• asking questions regarding things you do not know, are not clear on, or are confused about
• as information, concepts, processes become clear, that is something you can contribute to the project documentation (so you can better remember)

If you start too late, and do not ask questions, and do not have enough time and don't know what is going on, you are not doing the project correctly.

Taking our knowledge of LEDs and buttons:

• wire up the multicolored LED (3 separate wiringPi GPIO pins)
  • we are going to use software PWM to control this, which will give us 100 levels of adjustment
• wire up 3 buttons to individual wiringPi GPIOs (one for red, one for green, one for blue)
• wire up the rocker switch to its own wiringPi GPIO
  • one direction will indicate positive
  • the other direction will indicate negative
• implement logic so that, with the rocker switch in a given position, when pressing one of the color buttons, it adjusts that component of the multicolor LED in the appropriate direction (by a step of 10).
  • if a color value exceeds or dips below the allowed range, cycle it to the opposite end

To assist with consistency across all implementations, data files for use with this project are available on lab46 via the grabit tool. Be sure to obtain it and ensure your implementation properly works with the provided data.

lab46:~/src/SEMESTER/DESIG$ grabit DESIG PROJECT

You will want to go here to edit and fill in the various sections of the document:

• https://lab46.g7n.org/notes/c4eng/fall2023/projects/ptb2

The general flow of the process (one way of going about it, anyway) can be described as follows:

SET REDVAL, GRNVAL, BLUVAL TO ZERO
REPEAT INFINITELY:
    SHOULD THE INCREMENT POSITION ON THE SWITCH BE SET:
        SET DIRECTION TO POSITIVE ONE
    OTHERWISE:
        SET DIRECTION TO NEGATIVE ONE

    SHOULD THE RED BUTTON BE PRESSED:
        ADJUST REDVAL BY (TEN TIMES DIRECTION)

    SHOULD THE GREEN BUTTON BE PRESSED:
        ADJUST GRNVAL BY (TEN TIMES DIRECTION)

    SHOULD THE BLUE BUTTON BE PRESSED:
        ADJUST BLUVAL BY (TEN TIMES DIRECTION)

    ACTIVATE MULTICOLOR LED TO RGB VALUES CURRENTLY SET
    
    DELAY AT LEAST FIFTY MILLISECONDS

COMMENT: INFINITE REPEAT BLOCK CONCLUDES

To be successful in this project, the following criteria (or their equivalent) must be met:

• Project must be submit on time, by the deadline.
  • Late submissions will lose 33% credit per day, with the submission window closing on the 3rd day following the deadline.
• All code must compile cleanly (no warnings or errors)
  • Compile with the -Wall and –std=gnu18 compiler flags
  • all requested functionality must conform to stated requirements (either on this document or in a comment banner in source code files themselves).
• Executed programs must display in a manner similar to provided output
  • output formatted, where applicable, must match that of project requirements
• Processing must be correct based on input given and output requested
• Output, if applicable, must be correct based on values input
• Code must be nicely and consistently indented
• Code must be consistently written, to strive for readability from having a consistent style throughout
• Code must be commented
  • Any “to be implemented” comments MUST be removed
    • these “to be implemented” comments, if still present at evaluation time, will result in points being deducted.
    • Sufficient comments explaining the point of provided logic MUST be present
• No global variables (without instructor approval), no goto statements, no calling of main()!
• Track/version the source code in your lab46 semester repository
• Submit a copy of your source code to me using the submit tool (make submit on lab46 will do this) by the deadline.

Let's say you have completed work on the project, and are ready to submit, you would do the following (assuming you have a program called uom0.c):

lab46:~/src/SEMESTER/DESIG/PROJECT$ make submit

You should get some sort of confirmation indicating successful submission if all went according to plan. If not, check for typos and or locational mismatches.

I'll be evaluating the project based on the following criteria:

65:ptb2:final tally of results (65/65)
*:ptb2:used grabit to obtain project by the Sunday prior to duedate [6/6]
*:ptb2:clean compile, no compiler messages [7/7]
*:ptb2:switch is read and adjusts color level direction [13/13]
*:ptb2:each button adjusts its pertinent color level [13/13]
*:ptb2:multicolor LED displays current set RGB levels [13/13]
*:ptb2:code tracked in lab46 semester repo [13/13]

• each class member is to participate in the contribution of relevant information and formatting of the documentation
  • minimal member contributions consist of:
    • near the class average edits (a value of at least four productive edits)
    • near the average class content change average (a value of at least 256 bytes (absolute value of data content change))
    • near the class content contribution average (a value of at least 1kiB)
    • no adding in one commit then later removing in its entirety for the sake of satisfying edit requirements
  • adding and formatting data in an organized fashion, aiming to create an informative and readable document that anyone in the class can reference
  • content contributions will be factored into a documentation coefficient, a value multiplied against your actual project submission to influence the end result:
    • no contributions, co-efficient is 0.50
    • less than minimum contributions is 0.75
    • met minimum contribution threshold is 1.00

• Solutions not abiding by spirit of project will be subject to a 50% overall deduction
• Solutions not utilizing descriptive why and how comments will be subject to a 25% overall deduction
• Solutions not utilizing indentation to promote scope and clarity or otherwise maintaining consistency in code style and presentation will be subject to a 25% overall deduction
• Solutions not organized and easy to read (assume a terminal at least 90 characters wide, 40 characters tall) are subject to a 25% overall deduction