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Control of an RC car via an M68HC11 microcontroller

Control of an RC car via an M68HC11 microcontroller. ECE 345 - Senior Design Project Paul Whitaker and Robert Swanson. Introduction. Why we chose this project Practical applications. Project Block Diagram. Introduction. Why we chose this project Practical applications. Hardware Design.

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Control of an RC car via an M68HC11 microcontroller

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  1. Control of an RC car via an M68HC11 microcontroller ECE 345 - Senior Design Project Paul Whitaker and Robert Swanson

  2. Introduction • Why we chose this project • Practical applications

  3. Project Block Diagram

  4. Introduction • Why we chose this project • Practical applications

  5. Hardware Design • Transmitter • Switching circuitry • Keypad with input encoder • GPS equipment

  6. Analog Switch Operation Harris HI-300 CMOS Analog Switch • Output nodes become connected together when the input goes high Pads on remote control unit circuit board Input from Port B of microcontroller

  7. Hardware Design • Transmitter • Switching circuitry • Keypad with input encoder • GPS equipment

  8. Keypad Encoder Operation National Semiconductor MM54C922 16-Key Encoder Outputs to microcontroller Port C Row and column inputs from Grayhill 4x4 Matrix Output Keypad

  9. Hardware Design • Transmitter • Switching circuitry • Keypad with input encoder • GPS equipment

  10. Software Design • Command output • Keypad input • Preset motion sequences • Time delay subroutine

  11. Simplified Software Flowchart Begin loop Directional signal? Send “begin motion” signal YES NO Sequence signal? Execute preset motion sequence YES NO

  12. Project Economics • Parts • Labor

  13. GPS receiver Radioshack Jammer Motorola M68HC11 Total parts cost $268 $39 $199 $506 Parts:

  14. Total person-hours Hourly salary Labor cost Support factor Total labor cost 160 $25 $4,000 2.5 $10,000 Labor:

  15. Project Economics • Parts • Labor • Total cost: $10,506

  16. Project Accomplishments • Used a microcontroller in conjunction with assembly code to control a complex system • Gained experience interpreting component specifications and datasheets • Implemented a matrix-style input keypad

  17. Educational Benefits • Improved our analytical abilities by determining the functionality of undocumented hardware • Developed our leadership and teamwork skills • Gained experience working under project deadlines

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