Computer Engineering Activities Infra Red Security Interface SI 2004

1
Computer Engineering ActivitiesInfra Red
Security InterfaceSI 2004

• Graham Smyth
• smythel_at_mnsi.net

2
Computer Engineering Units

• Grade 10/11/12
• 1. Hardware
• 2. Networking
• 3. Integrated Circuits
• 4. Programming
• 5. Interfaces

3
Interfacing Activities

• Grade 10
• One bit
• Three LEDs
• LED simulators
• ASCII
• Binary counting
• Light patterns
• Intersections
• AC ???

• Grade 11
• One bit
• One byte
• DC motor
• Bi-directional
• LED traffic light
• LED intersection
• Demultiplexer
• GUIs
• Mouse control
• AC ??

4
Interfacing Activities

• Grade 12
• One byte
• LED intersection
• Stop Lights AC?
• Vehicles
• Security systems
• Drag strips
• Music Box
• Latches
• Marquees
• GUIs/Mouse Control

5
Introduction to Traffic Lights
6
Traffic Lights
7
Traffic Lights
8
Introduction to Motors
9
Motors
10
Breadboard Connections
Connected
High Fives
Divider
Low Fives
Connected
11
Security Software
Turing

• parallelput(number) - reads 8 pins
• put parallelget - reads 5 pins
• mousewhere(x,y,click)
• play(CDEFG)
• drawline(x1,y1,x2,y2,red)
• Provincially licensed

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Interfacing System Unit 5
Computer Interface Peripheral

• Parallelport

• Wires
• ICs
• Resistors
• Capacitors
• Transistors

• LED's
• Motors
• Lights
• Robots
• Music Box
• Joysticks

Wires
Wires
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Security System Project

• Develop a security system based on infra red
  beams. The system should include
• Two IR beams.
• When either or both beams are broken then
  corresponding LEDs should be activated to warn
  the users that intruders have entered the
  premises.
• Additional features will be added as time
  permits.

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Hardware Required

• 4 pair cable
• Short wires for jumpers
• Two LEDs
• Two emitters (here white)
• Two receivers (here dark coloured)
• Two 10k resistors (brown/black/orange)
• Four 220 resistors (red/red/brown)
• Breadboard
• D sub connector
• 8 male pins
• 7805 regulator
• Power supply

15
Hints and Tips

• Buy in pairs
• Clearly identify emitter and receiver
• Clearly identify polarity ( and legs)
• Buy according to application
• Check ratings (voltages required)
• Test emitter with LED (or multimeter)
• Test collector with flashlight
• Build one step at a time
• Demonstration/ testing model

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Security Hardware - Resistors
1 0 X 103
Red Red
Brown Gold
Tolerance -5
Resistors 220 ohm red/red/brown 10K
ohm brown/black/orange
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Resistor Chart
18
Security Hardware Cable D sub to Breadboard
Male Pin
Insulated Wire
Small Crimp Tab
Stripped Wire
Large Crimp Tab
Need White/Brown, Brown, White/Green, White
Orange, White Blue
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D Sub Connector /Harness
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4 Pair Colour Code
White/Blue
Blue
White/Orange
Orange
White/Brown
Brown
Green
White/Green
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Security Hardware Parallelport
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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D Sub Connector
Pin 10
Pin 2
D sub Connector
Pin 18
23
D Sub Connector Colour Code
24
D Sub Connector Wires
Pin 2 White/Brown is the Second Hole Down Bottom
ROW
Pin 3 Brown - 3 Down
Pin 18 White/Green Top Row 5 Down
Short side on top
Pin10 White/Orange 4 holes from bottom
Pin 11 White/Blue 3 holes from bottom
25
Photo Gates
Here 5V
26
Voltage Regulator (7805)
7805
Input Voltage
Output Voltage5V
Ground
27
Regulator
7805
Input Voltage
Ground
28
Powering Breadboard
5V
Ground
29
Photo Gates Emitter /Receiver
Emitter
Receiver
Bump Front
-


-
30
Emitter 1
220 ohm

-
Jumper1
31
Receiver 1
Brown/Black/Orange
White/Orange From pin 10

-
Jumper 2 - Aligned
White/Green Pin18
32
SoftwareReceiver 1
loop put parallelget Returns input pin
number end loop

• Beam parallelget value
• Not broken X
• IR 1 Broken Y

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Emitter Receiver 2
Red/Red/Brown
Brown/Black/Orange

-
Jumper 4 Aligned
Jumper 3 Aligned
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Emitter Receiver 2
White/ Blue
35
SoftwareReceiver 1 and 2
loop put parallelget Returns input pin
number end loop

• Beam parallelget value
• None broken X
• IR 1 Broken Y
• IR 2 Broken Z
• IR 1 and 2 Broken W

36
IR with LEDs
Red/Red/Brown Aligned (2)
Two LEDs
Jumper 6
Jumper 5
37
IR with LEDs Connected
White/Brown
Brown
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IR and LED Software

• var value int
• loop
• value parallelget
• put value
• if value X then
• parallelput (0) LEDs Off
• elsif value Y then
• parallelput (1) Activates LED1
• elsif value Z then
• parallelput (2) Activates LED2
• elsif value W then
• parallelput (3) Activates LED1 and 2
• end if
• end loop

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Level 4 Enhancements

• Add sound to the IR system where one note is
  played when the first IR sensor is broken (ex
  C), another note when the second is broken (ex
  E), and a third note when both are broken (ex
  G).
• Display the message Sector 1 has been
  infiltrated when beam 1 is broken. Similar
  messages for beam 2, and also beam 1 and 2.
  Display Situation normal when no beams are
  broken.
• Add a GUI representing the two LEDs. Activate the
  GUI at the same time as the real world LEDs are
  activated.
• Add an additional arming feature where each IR
  system can be armed individually.
• Add an annoying buzzer system the will activate
  when either IR beam is broken.
• ???Innovative???

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Addresses
smythel_at_mnsi.net www.classictechnology.ca www.ho
ltsoft.com