2. Why Laser Mouse?
Professors
Business Professionals

3. How Does it Work?

4. Camera to FPGA Find Brightest 3 Pixels in a Row Color Mapping
Send Middle Pixel Data to Next Step - Microcontroller

5. Camera to FPGA: Data Flow

6. XBUS: FPGA to Microcontroller
Use Xbus Interface we designed in Class
Only need one way communication
Takes Bright Spot Pixels from FPGA and sends them to Microcontroller

7. Microcontroller Data Flow
Takes Bright Spot Information from FPGA
Converts it from Camera Pixels to Laptop Pixels
Data Flow (Shown Below)
Get Data from XBus
Correlation & Mapping

8. Relative Coordinates & Calibration
Point 1
Get Absolute Coordinates from Camera
Find Delta X and Delta Y
These are Relative Coordinates to Send to PS/2
Find Boundaries of Monitor Projection
Delta X
Point 2
Delta Y
Click 1
Click 2

9. PS/2: Microcontroller to Laptop
Ships it to laptop through PS/2 (Mouse) Port
PS/2 Packet
To PC
Mouse Click

10. PS/2 Protocol Send 3 Data Packets Mouse Click and Movement Info
Relative X Coordinates
Relative Y Coordinates
Keep Clock Low for 170 microseconds between packets

11. Design Decisions Good Decisions  Bad Decisions 
Used RC2 Camera and provided camera project
Bad Decisions 
Tried to implement a Software (Win NT) Laser Mouse Driver

12. What Works…and Almost Works
Pin Issues

13. Future Improvements Software Laser Mouse Driver
Palm Pilot Graffiti style Handwriting Recognition
Wireless Mouse Click Button

14. Questions?