1 Talkie Board Delivery Review 19 February 2008 ARMS 1209

2 Introduction  Project Leader: Sridhar Tamminayana, Soph. ME Pradnav Kachhwaha, Senior ECE Nitin Aswani, Senior ECE Talkie Board

3 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

4 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

5 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 Talkie Board

6 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 Talkie Board

7 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 Talkie Board

8 Project Specifications Requirement:Specification: Ability to Record SoundsHold 15 pre-recorded sounds, up to 7 seconds in length Record LengthRecorded message length should be no longer than what is spoken Play LengthPlay time should only be length of message Sound AccessAccess to sounds based on card, not location Different ModesBe able to change between record/play and between pickup/takeoff of cards Talkie Board

9 Project Specifications Requirement:Specification: ActivationAbility to activate the device once in desired mode Multiple Message AccessibilityAllow up to 4 messages to be available for use Power ControlAbility to turn on/off AccessibilityControls easily accessible to instructor ViewingCards presented at an angle of 45 o to a flat surface for ease of viewing Talkie Board

10 Project Specifications Requirement:Specification: Weight< 5 lbs. Size< 6in x 6in x 12in Cost< $200 Talkie Board

11 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 Talkie Board

12 Systems Overview Talkie Board Optical Card Reader Micro- controller Sound Chip Microphone Speaker Mode Selection Card Bay 1Card Bay 2Card Bay 3Card Bay 4 Bay Switches Memory Address Circuitry

13 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 Talkie Board

14 Design Overview Clear MaterialPhotocell Base Changeable card Microswitch Talkie Board Light Blocking Piece

15 Operational Overview Talkie Board

16 Detailed Circuit Design Talkie Board

17 Design Overview: Card Identification Talkie Board LED Array Bay 1 LED Array Bay 2 LED Array Bay 3 LED Array Bay 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

18 Design Overview: Card Identification RequirementSpecificationSolution Sound AccessAccess to sounds based on card, not location 4 bit card identification read through optical sensors Different ModesBe 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 Talkie Board

19 Design Overview: Mode Selection Talkie Board Record/Play Place/Take Away On/Off Record Enable MicrocontrollerSound Chip Mode Selection

20 Design Overview: Mode Selection RequirementSpecificationSolution Different modesBe able to change between record/play and between pickup/takeoff of cards Toggle switches used to select between different modes Power ControlAbility to turn on/offToggle switch used for on/off ActivationAbility to activate the device once in desired mode Record enable button for activating once in record mode Talkie Board

21 Design Overview: Sound System Talkie Board Sound Chip Speaker Microphone Microcontroller Memory Address Circuitry Mode Selection

22 Design Overview: Sound System RequirementSpecificationSolution Ability to Record SoundsHold 15 pre-recorded sounds, up to 7 seconds in length Sound chip selected has necessary onboard memory for storing audio Sound AccessAccess to sounds based on card, not location Recordings stored to specific memory addresses tied to 4- bit card idea Different ModesBe 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 Talkie Board

23 Design Overview: Sound System RequirementSpecificationSolution Record LengthRecorded message length should be no longer than what is spoken Pressing record button stops recording Play LengthPlay time should only be length of message Sound chip only plays message, then disables sound output Talkie Board

24 Design Overview: User Interface Talkie Board Record Enable Record Play Place Take On Off Power Plug Micro- phone

25 Design Overview: User Interface RequirementSpecificationSolution Multiple Message Accessibility Allow up to 4 messages to be available for use Four trays incorporated into casing AccessibilityControls easily accessible to instructor All controls placed on back of device ViewingCards presented at an angle of 45 o to flat surface for ease of viewing Card trays placed at 45 o Weight< 5 lbs.Wood construction – 4.87 lbs. Size< 6in x 6in x 12inWood construction – 5in x 6in x 12in Talkie Board

26 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 Talkie Board

27 Bill of Materials - Casing  Wood - $20.00  Screws - $5.00  Plexiglass - $15.00  Paint - $15.00  Total Casing: $55.00  Total Electrical: $  Grand Total: $ Talkie Board

28 Field Readiness Requirement: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 LengthRecorded message length should be no longer than what is spoken Recording stops when button pressed Play LengthPlay time should only be length of message Monitoring of audio line shows signal stops when message ends Sound AccessAccess to sounds based on card, not location Cards placed in any slot accesses correct message Different ModesBe able to change between record/play and between pickup/takeoff of cards Mode selecting switches change between modes Talkie Board

29 Field Readiness Requirement:Specification:Test/Results: ActivationAbility to activate the device once in desired mode Record 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 ControlAbility to turn on/offOn/Off switch turns on/off device AccessibilityControls easily accessible to instructor Controls placed on back of device ViewingCards presented at an angle of 45 o to a flat surface for ease of viewing Card trays sit at 45 o Talkie Board

30 Field Readiness Requirement:Specification:Test/Results: Weight< 5 lbs.Actual weight = 4.87lbs Size< 6in x 6in x 12inActual dimensions = 5in x 6in x 12in Cost< $200Actual cost = $ Talkie Board

31 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 Talkie Board

32 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 Talkie Board

33 Future plans  No new features or redesign is anticipated at this point Project is fully functional and ready to be deployed Talkie Board

34 Questions?