EGR 304 Homework

DORDT UNIVERSITY ENGINEERING DEPARTMENT
EMBEDDED MICROCONTROLLER SYSTEMS--EGR 304
(Spring 2020)

PROBLEM SETS

(Last update: 5/04/2020 5:14 pm)

PS #	Assigned	Due	Returned	Assignment
10	5/04	---	---	Topics: Privacy & Security in Embedded Sys Message Brokering Services Read: Chapter 17 in our textbook. Also read Message Brokers from IBM.
9	4/15	4/24	4/28	Topics: Synchronous serial interfacing, USB Browse: the Universal Serial Bus Specification version 2.0 (Click the link above and download the zip file. Then within the zip file find file usb20.pdf. Browse that file.) Read: Selected pages of the above file as suggested in the essay questions. Download these essay questions. Use a word-processor to answer the essay questions. Then upload your file (click link) to Canvas. Optional: Browse the entire web site of usb.org The specs. are in the "document library" which can be accessed from a small link in the fine-print near the bottom of the home page.
8	3/27	4/03	Graded auto- matic- ally Nothing to return	Topics: Synchronous serial interfacing, Ethernet Read this Ethernet Tutorial. Take this twenty-question quiz on Ethernet. E-mail your quiz grade to Prof. De Boer. You are encouraged to repeat the quiz until you get a perfect grade. Turn in only your best grade. Optional: Example Python sockets using TCP/IP Optional: Books in Dordt's Library Optional: Wikipedia article Ethernet
7	2/28	3/27	4/01	Topics: Task scheduling, Measuring freq, period Memory, AC load control, Serial interfacing and RS-232, Ethernet Read RS-232 in Wikipedia Do this problem: Plot voltage vs. time of the Tx line in RS-232 for sending this text: "Z#" (without the quotation marks, with a capital "Z"). Assume ±12 V signal voltages, 53 kbaud, eight data bits, and one stop bit. Be sure to label your axes properly. An ASCII table can be found in many places, e.g. http://www.asciitable.com Note that the illustration in the Wikipedia reading does not have properly labeled axes. Specifically the the independent axis lacks scale and units. Optional: The entire RS-232 standard is available from Dordt's library. Interface Between Data Terminal Equipment And Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange TK7887.5 .I57 1997 Optional: Read about teleprinters. Very Optional: Listen to a Teletype machine. And see a Teletype machine connected to a Digital Equipment Corporation (DEC, a brand) model PDP-8/e computer. This computer could be booted "manually" via a bank of switches that allows the direct entry of machine code word-by word, executing each instruction as fast as the operator can enter the code. Wow, that's fast! Optional: Example of RS-232 debug ports in various products leaving security vulnerabilities. Turn in your homework HERE On Tuesday, 3/17, the due date on this assignment was changed from 3/20 to 3/27 to accommodate the recent efforts related to slow the spread of corona virus.
6	2/14	2/28	3/02	Topics: Position sensing, interrupts Read: Class notes on position sensing including relative vs. absolute position, issues with vibration, quadrature sensing, V-scan and U-scan techniques. Also read Section 10.2 in Lee and Seshia Also read this overview on interrupts and this on Arduino interrupt programming Do these problems on encoders and interrupts. Hints on Problem 3.19 Optional related information: Details on a particular relative encoder Wikipedia article: "Rotary encoder" Detail of a 13-bit grey code absolute encoder. Wikipedia on Single-track grey code If you are a fan of the Raspberry Pi and/or Multithreaded programming (a foundation for object-oriented programming) you might like to look at Ch 11 in Lee and Seshia.
5	1/31	2/14	2/19	Topics: Digital-to-analog conversion, actuators solenoids, motors Scan through Chapters 2 and 3 of The Data Conversion Handbook, 2005 ed. Walt Kester. Read: Freescale's tutorials on motors. DC Motors Brushless DC Motors Stepper Motors Switched Reluctance Motors Brushless AC Motors (Now hosted by NXP, which bought out Freescale.) A few caveats about the above tutorials. . . In the illustration of the "Switched Reluctance" motor, the rotor will assume an induced magnetic field to oppose the applied magnetic field. This is not illustrated, probably because it might imply that the rotor is permanently magnetized, which it is not. It is just iron (or a steel alloy). In the illustration of the "AC Induction Motor" the coloration of the induced magnetic field in the rotor is backwards. According to Lens' Law, the induced field will oppose the applied magnetic field from the stator. Thus the red (north) pole of the stator will face a green (south) pole on the rotor, just as in any other motor. Also read Jones on Stepping Motors Do these problems on motors Helpful link: Lin model 211-13-01 and note the "Torque Curves" tab. (On 2/05 the due date on this assignment was changed from 2/07 to 2/14.)
4	1/24	1/31	2/12	Topics: Driving powerful loads, switch debouncing source modeling, decibels, signals and wiring, single-ended vs. differential analog-to-digital conversion, aliasing. Read: Classroom slides. Lee & Sechia, all of Ch 7, and in Ch. 10 Sections 10.1.1, 10.1.2, 10.1.4, 10.1.5. Do in Lee & Sachia on page 207, Ex. 2, 3. Also draw a schematic to show to connect a hex-pad to an Arduino and be able to read the key-presses. Assume that the loop() program will repeat rapidly (at least 100 times a second). Specify how to connect the keypad to specific GPIO pins of the Arduino, how to set up each GPIO pin, and how to collect the key- presses in the loop procedure. Here is a typical hex keypad Turn in your work on paper in class on Friday, 1/31
3	1/17	1/24	2/03	Topics: Parallel Interfacing, I/O drivers Read: Classroom slides. Multiplexing and Charlieplexing, Multiplexing a Keypad, Debouncing a switch or keyboard (don't miss p2) Do Problem Set #3 found here. LED (LTL4243) information you will need is here. Use "Test Condition" or "Typical" data. Nominal forward current is 10 mA. (Abs. max. data is the verge of breakdown.) Turn in your work on paper in class on Friday, 1/24
2	1/13	1/17	1/27 Results shown via the link above	Topics: Version control of software Read: Classroom slides This assignment is designed to be worked mostly during the lab on Wed. 1/15. Follow this guide. Your finished work will be in dDB's repo. No other work needs to be turned in.
1	1/10	1/13	1/27 Since this was an elec- tronic sub- miss- ion, no physical item to return	Read the Preface and Chapter 1 from the Lee & Seshia textbook. View "Development Environments Overview" Briefly browse Getting Started with Arduino. Briefly browse this datasheet. Do the introductory problems Note the microcontroller chip on the Arduino Uno is part number "ATmega328P-PU" Turn this problem set in electronically. Save your answers as doc or docx format. Upload the file to Canvas via this link.

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