Electrical candle

1. Electrical candle ECE 411 Practicum Project Dung Vo DucPhan RamiAlshafi TalalAlshammari

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

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

4. Problem • 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 • 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. ApproachR3T3SD: 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. 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 • http://ece411.wikispaces.com/Sourcecode

16. Test Strategy • Unit tests • 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. 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. References • http://ece411.wikispaces.com • http://web.cecs.pdx.edu/~faustm/ece411/

21. Q & A

22. Thank you for attention!