1 / 28

ECE 477 Design Review Team 1  Spring 2008

ECE 477 Design Review Team 1  Spring 2008. Alan Bernstein. Ian Alsman. Ilya Veygman. Darshan Shah. Outline. Project overview Project-specific success criteria Block diagram Component selection rationale Packaging design Schematic and theory of operation PCB layout

avongara-kuron
Download Presentation

ECE 477 Design Review Team 1  Spring 2008

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ECE 477 Design Review Team 1  Spring 2008 Alan Bernstein Ian Alsman Ilya Veygman Darshan Shah

  2. Outline • Project overview • Project-specific success criteria • Block diagram • Component selection rationale • Packaging design • Schematic and theory of operation • PCB layout • Software design/development status • Project completion timeline • Questions / discussion

  3. Project Overview • Design of a turret with an armature structure that holds an airsoft gun • Detect and fire at enemies through both motion and threshold detection • Gun will pan/tilt based off coordinates translated by the microcontroller from the video feed • Friendlies can disarm the weapon with a remote

  4. Project-Specific Success Criteria 1. An ability to electronically fire an airsoft pistol (either autonomously or manually). 2. An ability to detect off-camera motion via ancillary sensors. 3. An ability to remotely disable device to prevent “friendly fire.” 4. An ability to automatically detect a (hostile) target within the camera’s field of vision. 5. An ability to pan and tilt the firearm assembly (a minimum of) 45° in the longitudinal direction and 30° in the latitudinal direction.

  5. BLOCKDIAGRAM

  6. Component Selection Rationale • Microcontroller vs. DSP • MC9S12XD (144-pin LQFP) • 80 MHz • 119 GPIO • Peripherals: 2 I2C, 6 SCI, 3 SPI • External Memory Bus Expansion (XEBI) • Easy to Program (JTAG/BDM) • Takes only 3.3V supply  much easier • DSP56371 (80-pin LQFP) and HC9S12 (32-pin DIP) • DSP: 150 MHz, Micro: 8MHz (control code) • GPIO: 39 pins • No External Memory Bus Expansion • DSP instruction set (i.e. filtering) • No means of programming • Needs 5V, 3.3V and 1.25V supplies  complicated!

  7. Packaging Design Main Considerations • Stability and Mobility • Modifiable • Housing for PCB, power supply, and other peripherals • Motors and Gearing • Gun Mount • Bearings

  8. Schematic/Theory of Operation • Overview: • ON BOARD • μC • Camera • Level translators • External RAM • Power regulators • Motor control logic • Fire Control • OFF BOARD • Motor Driver circuitry (H bridge circuits) • Ancillary sensors • Motion Detection (motion sensors vs. laser trip wires) • Friendly detectors • IR or radio remote

  9. Components ON BOARD * 60 pins used for I/O * 25 mA/pin = 1.5 A

  10. Components OFF BOARD

  11. Motor Control • Logic kept on PCB • Into PLD: • Direction • Enable • Clock • Out: • 1st/2nd/3rd/4th coil for some motor turned on • Driver circuitry off-board • Safety • Modularity • Current demands

  12. H-Bridge Circuitry (OFF BOARD)

  13. Friendly Detector and Motion Sensors • Fire Control • Turn AirSoft motor on/off • IR Input • Multiple off-board sensors summed • Range concerns • Switch to radio? • MS_xxxx • Currently motion sensors • Care about direction of signal • Switch to laser tripwires?

  14. PCB Layout • Main Considerations • MC9S12XD documentation suggestions: • Decoupling capacitors on supply pairs • Star and spoke configuration of copper pour • Headers for Microcontroller for easy routing and for future debugging • Organization of PCB layout based on voltage (3.3V and 5 V) • Separating analog and digital ground • Estimated Size: 5 in. X 5 in.

  15. PCB Documentation

  16. Component Placement 5 V 3.3 V POWER

  17. Software Design/Development Status • Control Code for the Stepper Motors • Assembly-based test code • Develop Lookup Table • Calibration • “Learning curve” speed control for smoothness • Video Processing/Targeting Code • Have basic algorithms • Looking for C-based version • User Interface Code • Should be fairly straightforward

  18. Flow Chart: Visual Detect Startup Capture backgrounds Wait Motion? No Yes Capture Area and Subtract Target Found? Coordinates To Motor Control Yes No

  19. Flow Chart: Control Software Startup Move to “0,0” position Wait Got Coords? No Wait Yes Lookup corresponding position Move main assembly Fire

  20. Project Completion Timeline • 1st week March – Finish tweaking PCB and schematic, make (hopefully) final parts order • 7 March – Proof of Parts/Final Schematic/Final Layout • Spring Break – Build assembly, begin developing software • 3-4th week March – Test software on board as part of development • 1st week April – Finish software, begin debugging • 15-20 April – Finish debugging/write user manual • 23 April – Present PSSCs!!

  21. Timeline

  22. Questions / Discussion

More Related