1. Electrical candle ECE 411 Practicum Project Dung Vo Duc Phan
Rami Alshafi
Talal Alshammari

2. Outline Introduction Design Problem Motivation Project objective
Schematic & layout
Motivation
Hardware
Programming
Project objective
Testing
Alternatives
Results
Requirements
Lesson learned
Approach
Conclusion

3. Introduction Decision making Design specification Design modeling
Programmer
Layout Designer
Programmer
Circuit Designer
Decision making
Design specification
Design modeling
Test plan
Editor
Mechanical designer
Tester, Editor

4. Problem Electrical candle
This is the term project for 411 class to practice for capstone project (PCB layout, solder…)
Electrical candle

5. Motivation
To design a “toy”.
Team work.
Programming.
Fun to do

6. Objective Skill practice (PCB layout, soldering…) Apply knowledge
Complete the requirements
The design of the electrical candle and it’s prototype

7. Alternatives Alternative features Alternative products
Airflow sensor vs. acceleration sensor
Powering up the device (solar panels vs. batteries)
Color change dependence (music vs. remote control and acceleration )
Alternative products
A light that changes colors continuously regardless of motion or any other inputs. Like the Halloween light toy candy.
Light changes due to sound or music
A light that changes with motion like the Play Station 3 wireless controller.

8. Requirements Functionality and performance:
The final device should operate in normal environment: ( 25 ° C dry room)
Mode 1: Light colors and intensity is depending on acceleration
Mode 2: light colors and intensity respond to a remote control
Powering the toy: batteries and wall adaptor

9. Approach R3T3SD: Research X 3, Think X 3, Specifications, Design
Fast is slow
Workload
Building from scratch vs. purchase
Design for extensibility (3 axis accelerometers vs. 2 axis)
Design for test (test points)
Design for environment (lead free)

10. Design

11. Schematic

12. Layout Board dimension: 2.7 x 2.7 inch (7 x 7 cm)
Fit with the battery holder
Spare space on the board is filled with headers (Port B, C, D) with intention of later extensibility
Thru hold components

13. Image created with Eagle 3D and POV-Ray
Layout - 3D view
Image created with Eagle 3D and POV-Ray

14. Hardware Microcontroller: ATmega 328P
Accelerometer: Fairchild MMA7260Q
IR receiver: TSOP34338 – 38 KHz IR receiver
RGB LEDs
ATmega328(Sparkfun)
Accelerometer breakout(Sparkfun)
IR receiver (Digikey)
RGB LED (Digikey)

15. Programming AVR studio 4 is used for programming Language: C
What need to be programmed?
ADC for accelerometer
Decode IR signal
PWM for RGB LEDs
Source code and explanation are available on Wiki

16. Test Strategy Unit tests Functional test Power supply test
Microprocessor
Accelerometer
IR receiver and remote control
Functional test
In Motion mode
In Remote control mode
Power supply test
Operation with batteries
Operation with wall adapter

17. Methodologies Start by testing beard board Finish by testing PCB
Unit tests
Functional tests
Power tests
Functional tests
Power tests

18. We have 4 electrical candles
Results
LEDS color patterns control by:
Motion of the device
Remote control
Power supply:
Operate with 3 AA battery packs
Operate with 5V wall adapter supply
4 PCBs all works,
We have 4 electrical candles

19. Lesson Learned Multi-cultural team work Project management
Documentations
Skill: Eagle CAD, programming, soldering…
What need to improve:
Effective meeting
Time management
What would we do differently?
Design more fancy housing
Use surface mount devices
Extend functionalities, e.g. sync LEDs color with music

20. Conclusion Accomplish project with working product
Chance to bring our knowledge into reality
Chance to look at our strength and weakness
Great opportunity for senior project.

21. References http://ece411.wikispaces.com

22. Q & A

23. Thank you for attention!