1. Wheelchair Navigation Aid Technical Content Review By Rob Riel

2. Overview Planned Workflow Top Level System Design Hardware Design Software Design Mechanical Design

3. Planned Workflow Design hardware devboard, use for testing, work out any gremlins Re-spin devboard once for connectors for final product Develop Software after dev board obtained Hardware Design Software Design Debug Hardware

4. Top Level System Design System processes data from range finding sensors User is alerted visually and via sound of object encroachment. Product contains LCD screen which displays useful information Product also lights path of wheelchair with high power LED lighting

5. Top Level Design cont.

6. Hardware Design Hardware incorporates proven design practices such as: – UART-> FTDI -> USB Total board breakout connectors for access to all pins. (great for debugging and development) Stable 8Mhz operation Over engineered power traces to prevent burnouts Onboard Temp monitoring

7. Hardware Design cont.

8. Hardware Layout

9. Rendered Product Electronics

10. Software Design Software incorporates maximum efficiency by using: ISRs whenever possible Lightweight LCD drivers designed in house DSP instructions which take 1 clk vs normal 4 clks. Because drivers are designed in house complete control is maintained over data flow, decreasing time to market due to debugging

11. Overall Code Diagram Run Time Routines and Data Processing System And Peripheral Setup Variable And Structure Definitions

12. Variable and Structures Define Loop Vars Define Constants Define Macros For Screen Define Sensor Struct Define Screen Struct Define UART Struct

13. System and Peripheral Setup Setup Oscillator Setup Watchdog Setup Pin State (TRIS) Set Initial Pin Output Setup ADC Regs Setup Interrupts Setup UART Init Regs Initialize Screen

14. Run Time Routines & Data Processing Fetch & Store Sensor Data Compare Sensor Data to Thresholds Update Screen ISR For Change Mode ISR For Sending Data Via UART Update State Machine, Store to Screen Structure Calculate Bat Remaining

15. Mechanical Design Control Box

16. Mech Design LCD Box

17. Schedule