1. P08009 Audible Memo Board Phase II Monday, October 22, 2007 P08009: Audible Memo Board Phase II Sponsor: Tala Hopkins Jon GosligaAudio Output Lead Loic HureauAudio Input Lead Jim VargheseAudio Lead Alex GorevskiSoftware Logic & Signal Conversion Lead

2. Project Description Device will be able to record audio messages. Designed to be usable without the use of vision and limited feeling in the fingers. –Velcro on every Wednesday to distinguish days of the month –Verification logic in case of accidental button presses Key high level customer needs / engineering specs: –Minimal steps in recording and playing back messages Usage Flow Charts have been designed –Time and data are retained when the power is off NAND Flash memory incorporated to retain audio data Clock Chip with an internal battery on power-down –The user can record, delete, and playback messages & the messages are easy to find Software Flowcharts have been designed Device will be able to record audio messages. Designed to be usable without the use of vision and limited feeling in the fingers. –Velcro on every Wednesday to distinguish days of the month –Verification logic in case of accidental button presses Key high level customer needs / engineering specs: –Minimal steps in recording and playing back messages Usage Flow Charts have been designed –Time and data are retained when the power is off NAND Flash memory incorporated to retain audio data Clock Chip with an internal battery on power-down –The user can record, delete, and playback messages & the messages are easy to find Software Flowcharts have been designed Monday, October 22, 2007 P08009: Audible Memo Board Phase II

3. Video Demonstration Monday, October 22, 2007 P08009: Audible Memo Board Phase II

4. Design Concept Calendar Mode Monday, October 22, 2007 P08009: Audible Memo Board Phase II Erase Playback Record Change Month Next/Previous Message Calendar

5. Design Concept Memo Mode Monday, October 22, 2007 P08009: Audible Memo Board Phase II Playback Record Different Memos Clock Mode Change Volume

6. System Architecture Monday, October 22, 2007 P08009: Audible Memo Board Phase II Microphone Amplification Band Pass Filter Microprocessor Debug Terminal Memory Storage Softwar e Logic ADC Timer D-A Converter Keyboard IO Ports Speaker Amplification Filter

7. Software Logic Monday, October 22, 2007 P08009: Audible Memo Board Phase II Old DesignRefactored Design

8. Technical Risk Assessment Risk: PCB Design difficulty and Proposed Mitigation –How many boards need to be developed? One board will be designed, which includes filters and amps for both the input and output stages of the circuit –How will we implement the power circuit? The power circuit will be designed on perf. board to save PCB costs (space saved) –Alternative evaluation board available? The current evaluation board will be integrated into the design –How will the boards be mounted to the box? The screws used will be flat-heads in which 4 holes will be drilled in the box. Standoffs will be used to hold the board above the surface of the box Risk: PCB Design difficulty and Proposed Mitigation –How many boards need to be developed? One board will be designed, which includes filters and amps for both the input and output stages of the circuit –How will we implement the power circuit? The power circuit will be designed on perf. board to save PCB costs (space saved) –Alternative evaluation board available? The current evaluation board will be integrated into the design –How will the boards be mounted to the box? The screws used will be flat-heads in which 4 holes will be drilled in the box. Standoffs will be used to hold the board above the surface of the box Monday, October 22, 2007 P08009: Audible Memo Board Phase II

9. Product Development Process Phase Phase 0: Planning Phase 1: Concept Development Phase 2: System Level Design Phase 3: Detailed Design Phase 4: Testing and Refinement MSD I (currently)MSD II Phase 0: Planning Phase 1: Concept Development Phase 2: System Level Design Phase 3: Detailed Design Phase 4: Testing and Refinement MSD I (currently)MSD II Monday, October 22, 2007 P08009: Audible Memo Board Phase II 01234

10. Current State of Design Functional Components –Audio input circuit –Audio output circuit –NAND Flash Audio Storage –Majority of software logic The Clock chip is being ordered so that the last of the functional requirements may be met Remaining software logic for the clock chip and small bug fixes Filtering needs refinement to reduce noise The project cost will rise due to the PCB Design –Old Design cost $435.95 –New Design will cost ~$280 $60 uController and Clock Chips $15 Headers, surface-mount resistors and capacitors $215 for the Printed Circuit Board Functional Components –Audio input circuit –Audio output circuit –NAND Flash Audio Storage –Majority of software logic The Clock chip is being ordered so that the last of the functional requirements may be met Remaining software logic for the clock chip and small bug fixes Filtering needs refinement to reduce noise The project cost will rise due to the PCB Design –Old Design cost $435.95 –New Design will cost ~$280 $60 uController and Clock Chips $15 Headers, surface-mount resistors and capacitors $215 for the Printed Circuit Board Monday, October 22, 2007 P08009: Audible Memo Board Phase II

11. MSD II Project Schedule Milestones 11/16/07: Finish the testing for the clock chip 12/10/07: Finish the development of the PCB layout 12/10/07: Order all parts and send out PCB design for fabrication 12/13/07: Begin testing the design with the PCB and make changes where necessary. 12/13/07: Finalize device code, finalize documentation. 1/30/08: Finish building, test final product with customer. Mid February: Functional and performance review. End of February: Final product review. 11/16/07: Finish the testing for the clock chip 12/10/07: Finish the development of the PCB layout 12/10/07: Order all parts and send out PCB design for fabrication 12/13/07: Begin testing the design with the PCB and make changes where necessary. 12/13/07: Finalize device code, finalize documentation. 1/30/08: Finish building, test final product with customer. Mid February: Functional and performance review. End of February: Final product review. Monday, October 22, 2007 P08009: Audible Memo Board Phase II

12. Thank you for attending. Questions? Monday, October 22, 2007 P08009: Audible Memo Board Phase II