1 talkie board delivery review 19 february 2008 arms 1209
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1
Talkie BoardDelivery Review
19 February 2008
ARMS 1209
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Introduction Project Leader: Sridhar Tamminayana, Soph. ME
Pradnav Kachhwaha, Senior ECE Nitin Aswani, Senior ECE
Talkie Board
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Project History Talkie Board began in Fall 2005 GLASS approached the team with a desire for an
improved version of Take n’ Talk
Talkie Board
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Community Need GLASS instructors often utilize
communication aids when working with students Cards representing different words
are given by the student to the instructor to communicate
Take n’ Talk allows for 4 messages to be stored and are tied to specific locations
Talkie Board
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Community Need Take n’ Talk records sounds to locations, not
objects, which can lead to misunderstandings Addressing the need will:
Allow GLASS instructors to communicate more effectively with students
Increase the abilities of GLASS students, allowing them to live more fulfilling lives
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Goals of the Project Talkie Board will provide a customizable
communication aid that will allow students to communicate through the use of pictorial representations, not specific locations
Talkie Board will not help students to physically speak on their own, but will provide a means to communicate through pre-recorded messages
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Goals of the Project Success Criteria:
This project must allow for messages to be tied to cards, not locations, and cost at most as much as currently used device
Deliverables: Talkie Board device 15 customizable cards User manual Detailed construction plans Detailed maintenance requirements
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Project SpecificationsRequirement: Specification:Ability to Record Sounds Hold 15 pre-recorded sounds, up
to 7 seconds in length
Record Length Recorded message length should be no longer than what is spoken
Play Length Play time should only be length of message
Sound Access Access to sounds based on card, not location
Different Modes Be able to change between record/play and between pickup/takeoff of cards
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Project SpecificationsRequirement: Specification:Activation Ability to activate the device
once in desired mode
Multiple Message Accessibility Allow up to 4 messages to be available for use
Power Control Ability to turn on/off
Accessibility Controls easily accessible to instructor
Viewing Cards presented at an angle of 45o to a flat surface for ease of viewing
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Project SpecificationsRequirement: Specification:Weight < 5 lbs.
Size < 6in x 6in x 12in
Cost < $200
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Functional Decomposition Card Identification:
Identify specific cards Identify when cards placed or removed
Mode Selection: Change between record/play, put on/take off, power on/off
Sound System: Record/play messages Access messages dynamically
User Interface Present cards in viewable manner Controls accessible to teacher, cards to student
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Systems OverviewTalkie Board
Optical Card Reader
Micro-controller
Sound Chip
Microphone
SpeakerMode
Selection
Card Bay 1 Card Bay 2 Card Bay 3 Card Bay 4
Bay Switches
Memory AddressCircuitry
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Design Overview The device will work by accessing prerecorded
messages based on card placed on device Each card will have a 4 bit number to access specific
memory address 4 bit number will be read using optical sensor Recorded messages will be related to number, not to
position
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Design Overview
Clear Material Photocell
Base
Changeable card
Microswitch
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Light Blocking Piece
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Operational Overview Talkie Board
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Detailed Circuit DesignTalkie Board
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Design Overview: Card Identification
Talkie Board
LED ArrayBay 1
LED ArrayBay 2
LED ArrayBay 3
LED ArrayBay 4
Photosensor Array Bay 1
Photosensor Array Bay 2
Photosensor Array Bay 3
Photosensor Array Bay 4
Card 1
Card 2
Card 3
Card 4
Switch 1
Switch 2
Switch 3
Switch 4
Memory Address Circuitry
Microcontroller
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Design Overview: Card IdentificationRequirement Specification SolutionSound Access Access to sounds based on
card, not location4 bit card identification read through optical sensors
Different Modes Be able to change between record/play and between pickup/takeoff of cards
Switches determine when card placed or picked up off
Multiple Message Accessibility
Allow up to 4 messages to be available for use
4 trays for cards available and monitored using switches and optics
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Design Overview: Mode Selection
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Record/Play
Place/Take Away
On/Off
Record Enable
Microcontroller Sound Chip
Mode Selection
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Design Overview: Mode SelectionRequirement Specification SolutionDifferent modes Be able to change between
record/play and between pickup/takeoff of cards
Toggle switches used to select between different modes
Power Control Ability to turn on/off Toggle switch used for on/off
Activation Ability to activate the device once in desired mode
Record enable button for activating once in record mode
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Design Overview: Sound System
Talkie Board
Sound Chip Speaker
Microphone
Microcontroller
Memory AddressCircuitry
Mode Selection
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Design Overview: Sound SystemRequirement Specification SolutionAbility to Record Sounds Hold 15 pre-recorded sounds,
up to 7 seconds in lengthSound chip selected has necessary onboard memory for storing audio
Sound Access Access to sounds based on card, not location
Recordings stored to specific memory addresses tied to 4-bit card idea
Different Modes Be able to change between record/play and between pickup/takeoff of cards
Sound chip can both record and play messages, mode determined by microcontroller
Multiple Message Accessibility
Allow up to 4 messages to be available for use
Any messages accessible through memory address
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Design Overview: Sound SystemRequirement Specification SolutionRecord Length Recorded message length
should be no longer than what is spoken
Pressing record button stops recording
Play Length Play time should only be length of message
Sound chip only plays message, then disables sound output
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Design Overview: User Interface
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Record Enable
Record
Play
Place
Take
On
OffPower Plug
Micro-phone
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Design Overview: User InterfaceRequirement Specification SolutionMultiple Message Accessibility
Allow up to 4 messages to be available for use
Four trays incorporated into casing
Accessibility Controls easily accessible to instructor
All controls placed on back of device
Viewing Cards presented at an angle of 45o to flat surface for ease of viewing
Card trays placed at 45o
Weight < 5 lbs. Wood construction – 4.87 lbs.
Size < 6in x 6in x 12in Wood construction –
5in x 6in x 12in
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Bill of Materials - Electronics 1: Motorola HC12 - $70.00 1: ISD25120 Sound Chip - $12.95 1: 8Ω Speaker - $2.00 1: Condensor Microphone - $1.49 2: 74LS157 dual 2:1 selector - $0.50 ea. 1: 74LS32 quad 2-input OR - $0.35 3: 74LS04 hex inverter - $0.41 ea. 16: Standard Output LED - $0.86 ea. 16: Photocells - $0.63 1: Pushbutton - $1.00 ea. 3: Rocker Switch - $0.89 ea. 4: Microswitches - $1.71 ea. Resistors, capacitors, wire - $5.00 total
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Bill of Materials - Casing Wood - $20.00 Screws - $5.00 Plexiglass - $15.00 Paint - $15.00
Total Casing: $55.00 Total Electrical: $128.37 Grand Total: $183.37
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Field ReadinessRequirement: Specification: Test/Results:Ability to Record Sounds
Hold 15 pre-recorded sounds, up to 7 seconds in length
Stored and accessed 15 unique messages of 7 seconds
Record Length Recorded message length should be no longer than what is spoken
Recording stops when button pressed
Play Length Play time should only be length of message
Monitoring of audio line shows signal stops when message ends
Sound Access Access to sounds based on card, not location
Cards placed in any slot accesses correct message
Different Modes Be able to change between record/play and between pickup/takeoff of cards
Mode selecting switches change between modes
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Field ReadinessRequirement: Specification: Test/Results:Activation Ability to activate the device once in
desired modeRecord enable button starts recording
Multiple Message Accessibility
Allow up to 4 messages to be available for use
Device holds 4 cards at a time, each card accesses correct message
Power Control Ability to turn on/off On/Off switch turns on/off device
Accessibility Controls easily accessible to instructor
Controls placed on back of device
Viewing Cards presented at an angle of 45o to a flat surface for ease of viewing
Card trays sit at 45o
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Field ReadinessRequirement: Specification: Test/Results:Weight < 5 lbs. Actual weight = 4.87lbs
Size < 6in x 6in x 12in Actual dimensions =
5in x 6in x 12in
Cost < $200 Actual cost = $183.37
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Maintenance Plan The Talkie Board will be checked once a
semester (more if requested) to ensure proper functioning
Any modifications or repairs will be made at the owners request
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User Training Teachers at GLASS will be instructed in the use
of the Talkie Board Recording sounds Different modes Troubleshooting issues
User manual will be provided
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Future plans No new features or redesign is anticipated at this
point Project is fully functional and ready to be deployed
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Questions?