Computer Engineering: Interfacing Activities Grade 12 Summer Institute 2002

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Computer EngineeringInterfacing
ActivitiesGrade 12Summer Institute2002

• Graham Smyth
• smythel_at_mnsi.net

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Computer Engineering Units
Grade 12 Five Hands-0n Units

• 1. Hardware
• 2. Networking
• 3. Integrated Circuits
• 4. Programming
• 5. Interfaces

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Breadboard
Top Rail Connected
Connected In Fives
Bottom Rail Connected
Divider
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Interfacing System Unit 5
Computer Interface Peripheral

• Parallelport

• LED's
• Motors
• Lights
• Robots

• Wires
• ICs
• Resistors
• Capacitors
• Transistors

Wires
Software
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Hands-on Activities

• Motor Control
• Inputting Data
• Stop Lights

Student Project Demonstrations

• Intersection DC
• Intersection AC
• Music Box

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Parallelport(printer port)
Input I0 I3
Output D0 D7
13 12 11 10 9 8 7 6
5 4 3 2 1
25 24 23 22 21 20 19 18 17
16 15 14
Input I4
Grounds 18 - 25
View from back of Computer
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Stop Lights Interfaced
To Pins 2 3 4 18
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Stop Light Software Answer 1 Version 1

• parallelput (1) Red light
• delay (500)
• parallelput (2) Yellow light
• delay (500)
• parallelput (4) Green light
• delay (500)

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Stop Light Software Answer 2 Advanced Green

• parallelput (1) Red light
• delay (500)
• parallelput (2) Yellow light
• delay (500)
• for counter 1 .. 5
• parallelput (4) Green light on
• delay (300)
• parallelput (0) Green light off
• delay (300)
• end for

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Motor Control (physical)
From Pin 2
From Pin 18
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Motor Question

• Write a program that will
• Turn the motor ON for 3 seconds
• Turn the motor OFF for 2 seconds
• Turn the motor ON for 4 seconds
• Turn the motor off.

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Motor Software Answer

• parallelput (1) motor on
• delay (3000) for 3 seconds
• parallelput (0) motor off
• delay (2000) for 2 seconds
• parallelput (1) motor on
• delay (4000) for 4 seconds
• parallelput (0) motor off

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Input Wiring
I3 - Pin 13 Orange/Red I2 - Pin 12
Brown/White I1 - Pin 11 White/Orange I0 - Pin
10 Red/ Orange GND Pin 18 Gray/ White I4 -
Pin 15 White/ Blue
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Inputting Data Physical
10 11 12 13 15 18
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Inputting Software Assignment
Write a program that will continuously scan for
values input on the parallelport.
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Inputting Software Code
loop start of infinite loop put
parallelget returns a value from pins 10,
11, 12, 13, and 15. end loop end of loop
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Inputting Data Matrix
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Interfacing Activities

• Grade 12
• One byte
• LED intersection
• Stop Lights AC?
• Security systems
• Drag strips
• Music Boxes
• Latches
• Marquees
• GUIs
• Mouse control

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Addresses
smythel_at_mnsi.net www.classictech.on.ca www.holts
oft.com