LOW-VISION AUDIO PLANNER Mid Semester Presentation Senior Design I March 5th, 2015

TEAM MEMBERS Donna Jaison (EE) PCB Design Lead Analog Lead Sean Densford (EE) Analog Lead Firmware Lead Cory Hofsass (CPE) Software Lead Firmware Lead Hunter Groeneveld (EE) Mechanical Lead Power-system Lead Nandita Gupta (EE) Team Lead Human Computer Interaction (HCI) Lead. Testing Lead. Mechanical Lead

FACULTY ADVISER DR. BRYAN JONES Academic/Research and Fields of Interest: Robotics Real-time control system implementation Rapid prototyping for real-time systems Modeling and analysis of mechatronic systems Office(s): Simrall Engineering Building Room: 231 Phone:

The National Research & Training Center on Blindness & Low Vision (NRTC) Kendra Farrow Research and Training Associate The NRTC is the only U.S. Department of Education-funded center focused on employment outcomes of persons with blindness or low vision. We plan to utilize data and information from NRTC to support the Low-Vision Audio Planner.

WHAT DO YOU SEE?

 Problem  Solution  System Overview  Constraints  Technical  Practical  Progress  Timeline  Questions/Comments

PROBLEM  Visually impaired people have problems with organization: grocery lists, to-do lists, daily planner, calendar, etc.  Smart phones can be complicated and expensive.  Current audio recorders and planners are not completely effective.

MARKET SOLUTIONS 20 Second Recording Memo Offers two 10 second channels for lists, appointments, and contacts $10.95 The Mini Wilson Olympus VN- 722PC LCD screen with different levels of functionality (font size) $69.95 Stores multiple messages with up to an hour of recording time $24.95

DESIGN SOLUTION  Large buttons with distinct textures.  The t-shaped design allows the top and bottom to be easily referenced.

ORGANIZATION SOLUTION  Insert/Delete Functions  Multidimensional Folders  Circular List

TECHNICAL CONTRAINTS CONSTRAINTDETAILS Bit Resolution12 bits Sampling Frequency16 kHz MemoryExternal Response Time100 ms

BIT RESOLUTION From National Instruments

TECHNICAL CONTRAINTS CONSTRAINTDETAILS Bit Resolution12 bits Sampling Frequency16 kHz MemoryExternal Response Time100 ms

PRACTICAL CONSTRAINTS TYPEDETAILS EconomicPrice : $80 ManufacturabilitySize : 140mm * 75mm * 20mm Weight : 200g

SYSTEM OVERVIEW

PROGRESS  January  System overview  Microcontroller  Memory  Audio Circuit  Amplifiers  Configure  Clock  ADC  DAC

MICROCONTROLLER PROSCONSCHOICE dsPIC33EP128 GP502 [1] Experience1)Higher Operating voltage: 2)Less Number of I/O Pins: 3)No DAC 4)10 bit resolution ATMEL Xmega32A4U [2] 1) Low 0perating Voltage: 2)More Number of I/O Pins: 3)DAC present 4)12 bit resolution No previous experience

STORAGE PROSCONSCHOICE DATAFLASH [3] 1)Low Storage size SD CARD [4] 1)High storage size 2) Available in different sizes.

AMPLIFIER PROSCONSCHOICE LM741 [5] Higher gainHigher voltage LM386 [6] Lower Voltage 6 – 4.5V Lower gain

PROGRESS  February  Play Through  Microphone  Filter  Amplifier  Voltage Divider  Microcontroller  Filter  Amplifier  Speaker

HARDWARE OVERVIEW

PROGRESS  March  SD Card  SPI  SD Command  FAT32  Battery Circuit  reduce power

TIMELINE Identify system requirements Identify system constraints Design Overview and Constraints Divide project into different areas Hardware team, software team, power management. Implement solution Combine and integrate different parts Testing JANUARY FEBRUARY –TO MARCH APRIL

REFERENCE [1] Uk.farnell.com, [Online]. Available: [Accessed: 21- Mar- 2015]. [2] Ladyada.net, 'Atmega32u4 Breakout Board+', [Online]. Available: [Accessed: 21- Mar- 2015]. [3] Mikroe.com, 'MikroElektronika - microSD card 2GB with adapters - mass storage memory with fast SPI interface', [Online]. Available: adapter/. [Accessed: 24- Mar- 2015]. [4]Amazon.com, 'Amazon.com: Set of 5 pieces IC LM741 or LM741CN or UA741CN or UA741: Automotive', [Online]. Available: UA741/dp/B00CKMUFHY. [Accessed: 24- Mar- 2015]. [5] Beavisaudio.com, 'LM386 Power Amplifier Chip', [Online]. Available: [Accessed: 24- Mar- 2015].

QUESTIONS/ COMMENTS?