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

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

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

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

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

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

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.

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

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)

Design

Schematic

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

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

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)

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

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

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

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

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

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.

References http://ece411.wikispaces.com http://web.cecs.pdx.edu/~faustm/ece411/

Q & A

Thank you for attention!