1. ECE 477 Final Presentation Team 8 Spring 2013
Left to Right : Fabian Widyadri, Siddharth Bhosale, Vineeth Harikumar, Sriram Rangaramanujan

2. Outline Project overview Block diagram Design challenges
Individual contributions
Project demonstration
Questions / discussion

3. Project Overview Printer power management system
Use the power indicator LED as a light sensor
Control printer's power based on light levels
Route incoming print jobs to local storage/printer

4. Block Diagram 110VAC 110VAC Power Relay 3 3 H-bridge LED USB 6 4 RPG 4
100 ohms
LED
USB
PIC32MX795F512H Microcontroller
uSD Card
Amplifier Circuit 6 4
RPG 4
LCD Display 16
5VDC ?
SM Power Supply (to all components) 2

5. Design Challenges Developing LED sensing mechanism
Experimented with various sensing techniques
Developing a custom microSD card driver to handle individual data packets and I/O in blocks to the microSD card
Incorrect traces on PCB found after lot of debugging
Creating a reliable and safe high-voltage (110VAC) control solution

6. Individual Contributions
Vineeth Harikumar
Overall software design for all the drivers
PCB design and debugging
Prototyping the different components
Hardware + Software interaction

7. Individual Contributions
Siddharth Bhosale
Schematic and PCB design
Hardware prototyping and PCB population
LCD menu and RPG integration
System Integration and Packaging

8. Individual Contributions
Sriram Rangaramanujan
Schematic Development
PCB design and component population
LED Sensing
Overall hardware development

9. Individual Contributions
Fabian Widyadri
QA on the PCB and schematic design
Developed LCD driver
Developed microSD driver
Hardware and software interaction

10. Project-Specific Success Criteria
An ability to detect change in light in a room with an LED
An ability to control the printer’s power state and display it via an LCD on the detection of change in light
An ability to accept incoming print jobs and queue the jobs up using local memory while printer is in sleep mode
An ability to wake up printer and forward the queued up print jobs using standard protocol
An ability to control and set the various timeout options for the printer’s sleep and hibernate states based on user input

11. Questions?