#
including relative vs. absolute, two sensors,
binary vs. grey code, single-track codes,
v-scan, u-scan.
Optional related links:
Details on a particular relative encoder
Wikipedia article: "Rotary encoder"
Detail of a 13-bit grey code absolute encoder.
V-scan and U-scan encoding
Topics not covered this semester:
LCD Displays
Digital-to-Analog and Analog-to-Digital
View "55 Minute Alias" from You Tube.
Try this Java Applet, "Demonstration of Aliasing"
Try this Java Applet, "Sigma-Delta ADC Tutorial"
(Above links may require Internet Explorer.)
Optional: See this "multimedia article" from
IEEE Spectrum Online: "the Future of Music"
The IEEE link gives a perspective on the
dynamic range in the master mix. For an
opposing point of view see this article which
claims compression, "can make pop recordings or
live sound mixes sound musically better. . ."
Also read this application note on triacs (and
some other thyristors).
read Control of Stepping Motors and
read about Microstepping Myths
(A slightly differrent version of the same article.)
Do this problem:
Modify this H-bridge circuit to so that the
two bits of input to the driver are D for
direction and E for energize. These will
replace the existing inputs W1 and W2.
If E = 1 then the motor should be powered.
If E = 0 then the motor should freewheel.
The uC may then use pulse-width modulation on
E to control the motor's speed.
Hints: All the resistors and transistors will
remain interconnected exactly as shown in the
given schematic. The changes pertain to the
intput signals and the logic gates.
As given in Figure 1.a. . .
A logic-1 at pin 1 of U3 will turn Q5 on.
A logic-0 at pin 8 of U1 will turn Q6 on.
ATmega196V data book. (Pages 15–22.)
The Architectural Overview (pages 7, 8) may
also be helpful. Also to help you understand
what you are reading refer to these articles:
Wikipedea on Static RAM, and ROM,
and EPROM, and EEPROM, and FLASH memory,
and DRAM, and the first 24 slides (Through
"DRAM Evolution" and up to "Outline") of this
DRAM Tutorial (Hint: save the PDF to your
drive. Then open it in Acrobat Reader and use
"View | Rotate View. . ." from the top menu bar.
Also, Using Flash Memory in Embedded Apps.
Do problems on memories in the ATmega169.
Also read Smiley's Workshop Part 8
Do these problems on interrupts
in the library (Select "books" on the library's
web page, then enter "Universal Serial Bus" in
the search box) or available from USB.org.
Do these short essays on USB.
Optional: You may turn the assignment in
electronically via courses@dordt.
Optional Reading: USB article in Wikipedia
Take this twenty-question quiz.
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: Books in Dordt's Library
Optional: Wikipedia article Ethernet
Read about the IBM-PC Parallel Port
Read about the IEEE-488 interface bus
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: Listen to a teletype machine.
Optional: Read about teleprinters.
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
Read "Integrated development environment"
Read "AVR Butterfly Evaluation Kit: User Guide"
Do the introductory problems
Turn this problem set in electronically via
courses@dordt. (Maximum file size is 1 MB)
(This assignment was origianally posted with incorrect
"assigned" and "due" dates. They were corrected at
about 3:30 PM on Thursday, 1/13.)