ECE 477 Design Review Team 2  Spring 2006 Prashant Grimella Andy Brezinsky Tim Sendgikoski Clark Malmgren

Outline Project overviewProject overview Project-specific success criteriaProject-specific success criteria Block diagramBlock diagram Component selection rationaleComponent selection rationale Packaging designPackaging design Schematic and theory of operationSchematic and theory of operation PCB layoutPCB layout Software design/development statusSoftware design/development status Project completion timelineProject completion timeline Questions / discussionQuestions / discussion

Project Overview 2-Bit Robit is a “robotic dot-matrix printer”2-Bit Robit is a “robotic dot-matrix printer” Prints an image on a flat, open surface, using up to four user specified colors of spray chalk (or spray paint)Prints an image on a flat, open surface, using up to four user specified colors of spray chalk (or spray paint) Maintains correct heading by pinging a set of stationary beacons and calculating its locationMaintains correct heading by pinging a set of stationary beacons and calculating its location The robot will be powered by a two stepper motors.The robot will be powered by a two stepper motors. Average battery life and location system constraints will allow enough time to print a 10’ x 10’ image.Average battery life and location system constraints will allow enough time to print a 10’ x 10’ image. A user will convert an image into a direction file and upload it to the robotA user will convert an image into a direction file and upload it to the robot

Project-Specific Success Criteria An Ability to spray fixed-size circles of chalk at specified (X,Y) coordinates.An Ability to spray fixed-size circles of chalk at specified (X,Y) coordinates. An ability to accurately determine location (X,Y) and heading (N/S/E/W) of Robit based on fixed markers in print grid.An ability to accurately determine location (X,Y) and heading (N/S/E/W) of Robit based on fixed markers in print grid. An ability to traverse print the grid in a “progressive scan” fashion, with no more than 10% error.An ability to traverse print the grid in a “progressive scan” fashion, with no more than 10% error. An ability to “rasterize” an image file into a series of “spray dot of C/Y/M/K at location (X,Y)” commands.An ability to “rasterize” an image file into a series of “spray dot of C/Y/M/K at location (X,Y)” commands. An ability to control the function of and report the status of the Robit via an embedded web server.An ability to control the function of and report the status of the Robit via an embedded web server.

Block Diagram

Component Selection Rationale Main Microcontroller - Freescale MC9S12NE64Main Microcontroller - Freescale MC9S12NE64  112 pin LQFP, 70 pins general I/O  25 MHz  Requires 3.3V supply voltage  Built-in support for Ethernet  Group members familiar with HC12 family Beacon Microcontroller – Atmel ATmega8Beacon Microcontroller – Atmel ATmega8  Prior Art  23 I/O  5V supply voltage

Component Selection Rationale Power Supply  Linear LT1940 Step-Down Switching Regulator Provides both 5V and 3.3V from 12V inputProvides both 5V and 3.3V from 12V input High efficiencyHigh efficiency  Linear LTC1983 Charge-Pump Inverter Produce -5V output from 5V inputProduce -5V output from 5V input Requires few external componentsRequires few external componentsOp-Amp  National Semiconductor LM6154 Quad Op-Amp Cost effective product in our voltage rangeCost effective product in our voltage range Prior ArtPrior Art

Packaging Design

Schematic/Theory of Operation

PCB Layout duplicate this slide as necessary for each major block of your designduplicate this slide as necessary for each major block of your design

PCB Layout

Software Design/Development Status

Project Completion Timeline 2/173/63/133/203/274/34/104/174/24 PCB & Part Verification Mount and Solder PCB Software Design Packaging Integration Test & Debug

Questions / Discussion