1. 1 Talkie Board Project Review 2/19/2008 ARMS 1209

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

3. Talkie Board 3 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.

4. Talkie Board 4 Community Need  GLASS approached the team with a desire for an improved version of an existing product.

5. 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

6. 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.

7. Talkie Board 7 Goals of the project  Deliverables: Talkie Board device. 15 customizable cards. User manual. Detailed construction instructions. Detailed maintenance requirements.  Success Criteria This Project must allow for messages to be tied to cards, not locations, and cost at most, as much as currently used devices.

8. Talkie Board 8 Project Specifications Requirement:Specification: Ability to record soundsHold 15 pre-recorded sounds Sound AccessAccess to sounds based on card, not location VolumeControl volume level Different modesBe able to change between record/play and between pickup/takeoff of cards Power ControlAbility to turn on/off Multiple message accessibilityAllow up to 4 messages to be available for use

9. Talkie Board 9 Background Research  Current models of similar products allow for recording by card location only.

10. Talkie Board 10 Background Research RequirementMini Tape Recorder iPod & Griffin iTalk Talkie Board Ability to record sounds Sound Access Volume Different modes Power Control Multiple message accessibility Cost ≤ $50

11. 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.

12. Talkie Board 12 Operational Overview On/Off Switch Select Mode Select Activation Mode Press Record Button Pick up Card Remove Card Play Message Speak into base unit microphone Play Record pick up put down Select Card

13. Talkie Board 13 Identification Sub-system Overview Identify specific cards. Identify when cards placed or removed Requirements/selection criteria  Unique ID  Works in close proximity to other cards  Portable  Low power consumption  Maintenance  Inexpensive

14. Talkie Board 14 Proposed Solutions: Identification  RFID Use RFID to detect a tag placed near by. Each tag already has unique ID, no need to create one. Inexpensive.  Barcode Scanner Barcodes placed on cards and a scanner scans at each location. Unique IDs, but would need 4 scanners greatly increasing cost.

15. Talkie Board 15 Proposed Solutions: Identification  Reed Relay/Switch A magnet placed near a relay or switch activates circuit. Magnets are inexpensive but, underlying circuitry may be impractical to implement.  Teeth A unique pattern of grooves or teeth is arrayed along the bottom of each card and read with a laser. This could possibly introduce more mechanical problems than initially anticipated.

16. Talkie Board 16 Proposed Solutions: Identification  Resistance Each card would make a unique resistive contact to the base unit. Can choose what ever resistance values desired that makes calculations easier. Able to convert resistance to a voltage and compare values. Easy to implement voltage comparators. Resistors cheap and easily replaced.

17. Talkie Board 17 Proposed Solutions RequirementSpecRFIDBarcode Scanner Reed Switch TeethResistance Unique IDEach card must be uniquely identifiable from the other cards. Works in close proximity to other cards. The cards’ ID should not be affected by the distance or contact of other cards. PortableWorks inside and outside. No computer, laptop, or external assistance. (Stand alone) Low power consumption The indentifying technology should not require more than 5V. MaintenanceEach cards’ identification technology must last +5 years. CheapCost of maintenance or replacement should be less than $5 a year.

18. Talkie Board 18 Selection Criteria  Practicality Does solution make sense to implement?  Ease of use by user Does technology negatively affect how product is learned and used?

19. Talkie Board 19 Decision Matrix Concepts Engineering/Customer Requirements Weights RFID Barcode Scanner Light Sensitivity (Datum) Mechanical Resistance Optical Encoder Safety50-2000 Cost4-20010 Ease of implementation3-2000 Complexity4.5-2000 Modifiable by someone else5 0000 Reliability511001 Precision of Student4210 Power usage4-2000 Need for extra enable3.5 0000 Can add extra cards2220100 Weighted Total-18.5-250-7-5-10.5

20. Talkie Board 20 Discussion of future plans  Specification Development and Conceptual Design phase is still ongoing.  Still left to design: 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.

21. Talkie Board 21 Discussion of future plans  Card Identification Implementation of photo diode and using it to produce an address. Do testing to find exact resistance values based on light exposure.  Specification Development and Conceptual Design phase to be completed for remaining sub- systems.

22. Talkie Board 22 Discussion of future plans  To be completed this semester: Card ID. User Interface.

23. Talkie Board 23 Questions?