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haas:fall2024:c4eng:projects:stl0

Corning Community College

ENGR1050 C for Engineers

PROJECT: Seeing The Light (STL0)

OBJECTIVE

We commence on our exploration of the electronics kit, by creating and controlling an LED with a C program on our pi.

PROCESS

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.

TASK

After exploring, assembling, and testing the intended circuit, adapt the provided C code to blink the LED on the circuit, cycling on/off at least once every second.

GRABIT

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

EDIT

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

STL0

PREPARATION

INSTALL CUSTOM WIRINGPI
yourpi:~$ wget https://project-downloads.drogon.net/wiringpi-latest.deb

NOTE: domain is “dr-OH-gon”, it does NOT say “dragon”

yourpi:~$ sudo dpkg -i wiringpi-latest.deb
ACCESSING STL0 FROM YOUR PI

After finishing the set up of your pi and all updates have been downloaded and installed onto your pi, you then need to access a command prompt on your pi. Next, you will enter in the command prompt “wget https://lab46.g7n.org/~wedge/piph/download -O piph”. Then in order to run piph after it has been downloaded you enter the command “bash ./piph”. Then when asked for a password phrase simply hit the “enter” button and then follow the rest of the prompts given. After this has been downloaded and installed successfully then run the command “getconf LONG_BIT”, this will allow you to know what version of Raspberry Pi OS you are running. Based on this number (either 32 or 64) you will then either enter “wget https://lab46.g7n.org/~wedge/wiringpi_3.10_armhf.deb” then “sudo dpkg -i wiringpi_3.10_armhf.deb” (for the 32 version) or “wget https://lab46.g7n.org/~wedge/wiringpi_3.10_arm64.deb” then “sudo dpkg -i wiringpi_3.10_arm64.deb” (for the 64 version). After this you should be be able to cd directly into src, fall2024 and any other directories you have created as though you are on a non pi lab 46 shell. As well, if you have not already run the grabit command in order to get the stl0 project file you can do this now and have access to the project file for stl0 on your pi.

USING WIRINGPI: THE gpio TOOL
USING WIRINGPI: SETTING MODE OF PINS
USING WIRINGPI: WRITING TO PINS

ELECTRICITY

VOLTAGE / VOLTS

Voltage is the difference in electrical potential. In ohmic materials, V=IR, or voltage is equal to the product of the electric current times resistance. 1 volt equals 1 joule per coulomb.

GROUND

A physical connection between an electrical circuit and the ground, or some other body that acts as a safe path for excess electrical energy. Can also be a reference point from which voltage or electric potential is measured.

AMPERAGE / AMPS

Measurement of current through a circuit. 1 ampere is equivalent to 1 coulomb per second.

RESISTANCE / OHMS

A measure of how an object opposes the flow of electrical current. The units of resistance are ohms. One ohm is equal to one volt/ampere and can be calculated with V-IR → R=V/I which is voltage divided by current. Hence once ohm equals one volt/ampere.

DIGITAL ELECTRONICS

LIGHT EMITTING DIODE

A hardware component composed of a plastic covering over a small light source. Whenever electrons flow through the diode, they power the light source when the Light Emitting Diode (or LED) is connected to a motherboard or breadboard. The electrons can only flow one way through the wire; if the LED is not lighting up despite being hooked up to a working power source, the usual method to fix the issue is to simply switch the ends of the LED into their respective sockets to allow electron flow. LEDs can only be lit up for a limited amount of time; the longer they are lit and/or the brighter they are, the shorter their “lifespan.”

RESISTOR

A hardware device that limits the amount of electrons flowing through the circuit so as not to let the other components connected to the same power source be damaged by excessive electricity, which can cause irreparable damage to the system and result in one or multiple components needing to be replaced.

SERIES CIRCUIT

COMPONENTS

BREADBOARD
T-COBBLER / INTERFACE TO PI GPIO PINS
LED

An LED is actually just an acronym for “Light Emitting Diode”.

RESISTOR

TARGET CIRCUIT

 

SUBMISSION

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.

Submit Tool Usage

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.

RUBRIC

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

65:stl0:final tally of results (65/65)
*:stl0:used grabit to obtain project by the Sunday prior to duedate [16/16]
*:stl0:clean compile, no compiler messages [16/16]
*:stl0:program conforms to project specifications [17/17]
*:stl0:code tracked in lab46 semester repo [16/16]

Pertaining to the collaborative authoring of project documentation

  • 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

Additionally

  • 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
haas/fall2024/c4eng/projects/stl0.txt · Last modified: 2024/09/02 15:03 by 127.0.0.1