ENGR 499 Project 6 Laser Projector

Transcription

1 ENGR 499 Project 6 Laser Projector Supervisor: Mihai Sima Supervisor Contact: msima@ece.uvic.ca University of Victoria Department of Electrical and Computer Engineering Laboratory of Reconfigurable Computing Engineering PO Box 3055, STN CSC Victoria, B.C. V8W 3P6 CANADA phone: fax: Students Jacob Schwartz: malachi@uvic.ca Kendall Olsen-Maier: kao@uvic.ca Travis Danniels: tdanniel@uvic.ca Phil Kostaluk: philk@uvic.ca Group Contact: engr499@googlegroups.com

2 Table of Contents Introduction Purpose Table of Contents... 2 Introduction... 2 Purpose... 2 Scope... 3 The Team... 3 Problem Description... 3 Overview... 3 Process... 4 Revised Milestones... 4 Development Method... 4 Design... 4 Overall Requirements... 4 Safety Precautions... 4 Software Integration Test Plan... 4 Hardware Test Plan... 5 Hardware Components... 5 PC... 5 Microcontroller... 5 LASER Module... 5 Galvanometer Kit... 6 Software Tools... 6 IDE (AVR Studio)... 6 Flip OmniGraffle Professional (v )... 6 XCircuit... 6 Hardware Implementation... 7 The capability to project large, sharp, highly visible vector images or animations on flat surfaces has the potential to enable interesting new approaches to data visualization. This capability should be realized in a portable, affordable, and user-friendly device so as to maximize its number of potential users. This project focuses on the design and implementation of a computer-controlled laser projector which can display large, visually stunning vector (line drawing) images and animations on a variety of surfaces. Such a device has interesting applications to such diverse fields as data visualization, education, and marketing, to name a few. Though such devices already exist in the market today, they are generally either very expensive, professional-grade systems, or are inexpensive and overly simplistic. Our team aims to bridge this gap with a highly configurable laser projection system designed with the goals of affordability and portability in mind. At a high level, the system woks by tracing an image on to a surface using a laser beam. This is done at a sufficient rate so as to give the impression of a complete image or animation being "projected" on to the surface. The system is controlled entirely through software and is thus capable of displaying custom images and animations. Additionally, software libraries supplied with the system allow for it to be easily integrated into other applications such games, educational software, or data visualization tools.

3 Scope The final system will consist of four major components. 1. Personal Computer with Control Software 2. Microcontroller 3. LASER Module 4. X-Y Scanning Galvanometer The project will consist of creating or purchasing all four components and integrating them to create a single colour, high resolution laser vector display. The Team Jacob: Software Architect - Control Feed Design - Component Selection - Component Design - Lead Development Travis: Hardware Architect - Laser Synchronization - Component Assembly - Hardware Integration - Hardware Debugging Kendall: Project Manager - Team Leader - Quality Assurance Phil: Software Developer - Design Implementation - Web Presentation Problem Description Overview For the X-Y scanning module, store bought galvanometers will offer the best reliability and precision of control, and allow the project to focus on the software aspect without having to hand assemble the underlying hardware components. The hardware will provide the capability to control the scanning module using a USB data stream from a PC computer to the MCU. The laser module will be a simple, low to medium power laser with a blanking input. For the computer control unit, the two main options are to either output control signals directly from a laptop or PC, or to control the system through an embedded device. The trade-offs inherent in this decision were researched and it was decided that the scanning and laser modules would be controlled with a microcontroller. This allows high speed direct control of the hardware. Lastly, the nature of the control software will depend significantly on the computer control unit. The minimum software required will be a library for converting images and

4 animations to tables of X-Y coordinates, and driver software for sending these coordinates to the control unit. Additionally, a more friendly user interface be implemented, depending on the time available. Process Revised Milestones Jan Progress report I Jan Begin: research part specs, documentation Feb. 1 - Finalize and order parts Feb. 8 - Finish assembly portion of report (block diagrams, etc.) Feb Research interface/software development options, begin testing Feb Progress report II, parts arrive Mar. 1 - Begin assembly, build control circuit, build containment box Mar. 8 - Completed computer-laser communication, basic display Mar Project completed Mar Poster presentation Apr. 8 - Final report Development Method The development method will be consistent and iterative, representing engineering methodology best practices. Every time a change is made to the design, the affected documentation, diagrams, requirements, and test plan will be updated. In particular, when a change is made, the integration of each component will be completed every time to ensure the protection of the critical components. Design Overall Requirements The laser projector will display an image at 20Kpps at 8 degrees. Images will be visible when projected from 10m minimum before a noticeable decay in quality due to dispersion. Safety Precautions The use of the current 5mW laser is not strong enough to damage the human eye, but precaution to avoid direct contact with the eye is recommended. Software Integration Test Plan Each component communication pair will be tested at each incremental step. The X-Y Scanning Module is the most expensive and therefore will be integrated using a safeguard process. Every time a change is made, the integration test process will be restarted and possibly modified.

5 The safeguard process will use an oscilloscope to verify that the microcontroller is outputting the correct control signals. Hardware Test Plan After assembling the system's hardware modules, verification will be performed by connecting the control inputs, which would normally be connected to the MCU, to a device which outputs a standard test pattern (see ILDAtest.html for more information). After verifying the correct behavior of the system's hardware modules, work will be done to integrate the MCU into the existing system. Hardware Components The project will use the following hardware components. PC Responsible for user interface, line art generation, and synchronization. Communication with the MCU is done over a streaming USB interface, similar to a USB speaker. Microcontroller The ATAVRXPLAIN is a demonstration board manufactured by ATMEL. The board provides an ATxmega128A1 microcontroller, an AT90USB1287 communication chip, two high speed 12-bit Digital to Analog converters, 8mb of serial data flash as well as 8mb of SDRAM. LASER Module The laser module is assembled using a generic low cost 5mw 532nm 3v laser unit ordered from the far east. The laser unit is connected with a voltage regulator as well as a transistor allowing digital modulation to form a complete laser module.

6 Galvanometer Kit The SCANLSP20K galvanometer kit consists of a power supply, two galvanometers arranged in a X,Y scanning arrangement, and two driver boards. Additionally the kit ships with a DMX board which allows for replaying preset animations. Software Tools IDE (AVR Studio) The AVR Studio will be used to build, and develop C code specifically for the AT90USB1287 microprocessor unit. Flip Flip is an acronym for FLexible In-system Programmer. Flip will be used to load the program compiled with the AVR studio onto the AT90USB1287 microprocessor. OmniGraffle Professional (v ) OmniGraffle has been used to construct all necessary UML and block diagrams. XCircuit XCircuit has been used to construct all necessary circuit diagrams.

7 Hardware Implementation This section includes concrete, near-finalized hardware designs for various system components. The control circuit for the galvanometer drivers is shown below: The control circuit for the laser module is shown below:

8 The remaining hardware implementation work consists primarily of assembling the above circuits.