Electrical Engineering 145M - Spring 2000 - Derenzo - Midterm 1

Electrical Engineering 145M - Spring 2000 - Derenzo - Midterm 1

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Name (Last, First) Student ID number EECS145M 2000 Midterm #1 Page 1 Derenzo UNIVERSITY OF CALIFORNIA College of Engineering Electrical Engineering and Computer Sciences Department EECS 145M: Microcomputer Interfacing Laboratory Spring Midterm #1 (Closed book- calculators OK) Wednesday, March 1, 2000 PROBLEM 1 (30 points) In Laboratory Exercise 2 you measured the human reaction time between a visual prompt on the display screen and the pressing of the return key. This is an imperfect design due to random delays in refreshing the display screen (60 Hz) and the use of a slow (9600 baud) serial port to detect the pressing of the return key. You decide to use a parallel I/O port, a mechanical push button for user input, and a high-power, bright LED (light emitting diode) for the visual prompt. Assume the following: 1 The first press of the button alerts the computer that the user is ready. 2 The computer program then waits a random time from 5 s to 10 s and then lights the LED. 3 The user presses the button a second time to respond to the LED prompt. 4
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Electrical Engineering 145M - Spring 2000 - Derenzo - Midterm 1

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