1 Talkie Board Delivery Review 19 February 2008 ARMS 1209.

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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

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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

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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

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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?