ECE482 Final Project Spring 03

Specification Design a digital thermometer to report the temperature in the room in degrees Fahrenheit. The PC should update the room temperature once each second. A display as simple as the following is acceptable: Present room temperature is 78 degrees Fahrenheit. While you can have this message scrolling downward, it would be better if the message was updated in place. Work in teams of 3 (your choosing). You will demonstrate your project and give a brief oral presentation either before or after the final exam on Mon May 5 (6:30 – 8:10 pm). I would prefer that the presentations take place prior to the exam if possible.

Design of a Digital Thermometer

LM34 Thermometer IC

PC Extender Card

Buffering I/O Address Range 300H-31FH

Side View of Extender Card

Interface Trainer Decoding Circuitry

Connector and Cable

I/O Port Addresses Decoded by Trainer

PC Interface Trainer Module

PC Interface Trainer Connection

Simple Program to Test Port A

8255 PPI Chip Pinout

8255 Control Word

Example 4-5

Example 4-6

Writing a Character to the Screen

Writing a Character String to the Screen

Binary to Decimal to ASCII Conversion