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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 linke 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 tutorial on H-bridge drivers
(Please read all 3 parts of the above tutorial)
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.
Optional: Browse this "application note" on
Thyristors from Teccor (now part of Littlefuse)
and even more on Thyristors here
Optional: DC Motor Tutorial
Optional: Control of Stepping Motors
(This copy might print better on your printer.)
Scan over these application notes from National
Semiconductor on transmission lines. Read
The section in AN-807 on the "tabular method."
AN-806, and AN-807, and AN-808.
Do 2.1 and 2.6 in the handout linked above.
On 3/9, as per classroom discussion, the due
date was changed from 3/11 to 3/25.
On 3/23 at about 10 PM the due date was again
postponed, this time to April 1 (no foolin').
We will discuss this more in class on Thursday.
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 DDB.
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
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: 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)