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Wheelchair Navigation Aid

Wheelchair Navigation Aid. Technical Content Review By Rob Riel. Overview. Planned Workflow Top Level System Design Hardware Design Software Design Mechanical Design. Planned Workflow. Design hardware devboard, use for testing, work out any gremlins

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Wheelchair Navigation Aid

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  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 Software Design Hardware Design Final Re-spin 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 Variable And StructureDefinitions System And Peripheral Setup Run TimeRoutines and Data Processing

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

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

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

  15. Mechanical Design Control Box

  16. Mech Design LCD Box

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