Critical Design Review The Lone Rangers Brad Alcorn Tim Caldwell Mitch Duggan Kai Gelatt Josh Peifer Capstone 2007

Project Updates What We’ve Done –CMOS Image Sensor Schematic –MATLAB GUI –Purchased Parts –Began writing VHDL cores for different operations What Needs to be Done –PCB layout and build –Finish VHDL coding –Implement turntable with stepper motor and encoder –MATLAB image processing

Objective Updates What we want –3D object scanner that displays a full 3D model in MATLAB with smooth surfaces. –Build our own CMOS camera to take the pictures. Fallback –Use a webcam instead of building our own camera –Only plot points instead of smooth surfaces Extension –Add full color to model –Create a physical copy using the 3D printer –Add second camera for better resolution and more complex objects

What we are Using KAC megapixel Kodak CMOS Image Sensor Digilent Spartan III FPGA Development Board WorldStarTech 3.5mW “LASER” line generator ULL5-3.5G-635 US Digital Optical Shaft Encoder US Digital Stepper Motor MATLAB

High Level Functional Block Diagram FPGA CameraLaser Turntable Stepper Motor Encoder MATLAB –Image Processing Object Graphical User Interface

FPGA Block Diagram

FPGA I/O GPIO 40 Pin Headers –CMOS Imager –Laser –Stepper –Encoder Serial Port –Interface FPGA software with computer

Camera PCB We need to mount the image sensor on a PCB to interface with the FPGA board –40 pin header for ribbon cable –Proper grounding and decoupling –Voltage level shifting (sensor takes 3.0V) Need to allow space and proper mounts for a lens

PCB Schematic

CMOS Image Sensor (Optics) Kodak KAC-9648 CMOS Image Sensor –1288 x 1032 pixels –SXGA 18fps –Video Output: 8 or 10 bit Digital –6.0μm x 6.0 μm Pixel Size –Rolling Reset Shutter –3.0V Power Supply –150mW Power Consumption –1/2” Optical Format

CMOS Image Sensor (Optics)

Lens Afocal lens (both focal planes are at infinity) Final spot size of 12 to 15 um Demagnification on the order of 12^6 to 15^6

Laser ULL5-3.5G Adjustable Focus 3.5 mW power Glass lens 635 nm Wavelength 60 Degree Fan Angle

Old Record Player Encoder Stepper Motor Turntable

MATLAB

Bezier Surfaces

Graphical User Interface

GUI: Plot Types List PlotWireframe Solid

GUI: Resolution Low ResolutionHigh Resolution Med Resolution

Encoder Counter Core A B Reset Count A Reset Count B Count Forward Count Backward

Snapshot Control Core Input Signals Clk_50Mhz extsync – high when CMOS is taking a picture reset – snapshot core reset signal reg_snapshot – set from FPGA software –0x at rest –0x0000ffff to powerdown –0xffffffff to take picture Output Signals mclk – 25 MHz CMOS system clock pwd – high to power down CMOS resetb – reset signal to CMOS snapshot – must be high for one frame to take a picture (18 fps)

Updated Schedule

Division of Labor Brad- FPGA Josh- FPGA, PCB Mitch- Optics Kai- Optics, Machining Tim- Software, Encoder All- Stepper Motor

?