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

3. Introduction Why we chose this projectWhy we chose this project Practical applicationsPractical applications

4. Project Block Diagram

5. Introduction Why we chose this projectWhy we chose this project Practical applicationsPractical applications

6. Hardware Design TransmitterTransmitter Switching circuitrySwitching circuitry Keypad with input encoderKeypad with input encoder GPS equipmentGPS equipment

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

8. Hardware Design TransmitterTransmitter Switching circuitrySwitching circuitry Keypad with input encoderKeypad with input encoder GPS equipmentGPS equipment

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

10. Hardware Design TransmitterTransmitter Switching circuitrySwitching circuitry Keypad with input encoderKeypad with input encoder GPS equipmentGPS equipment

11. Software Design Command outputCommand output Keypad inputKeypad input Preset motion sequencesPreset motion sequences Time delay subroutineTime delay subroutine

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

13. Project Economics PartsParts LaborLabor

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

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

16. Project Economics PartsParts LaborLabor Total cost:$10,506

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

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