DEC13-02 Baby Swing Project Team Members: Rashed Alfalasi Ahmed - - PowerPoint PPT Presentation

DEC13-02 Baby Swing Project

Team Members: Rashed Alfalasi Ahmed Alharmoodi Matt Seymour Yezhou Fang

Our Team

Problem Statement

• Redesign the electronics of a baby swing
• Old Design

○ Motor was under powered and non-functional

• New Design

○ Replace the current brushed DC motor with a more

reliable component

○ Add more features to the existing design ■

Play music directly from iPod while charging it at the same time

■

Should be able to operate continuously for 15 hours a day 7 days a week for 2 years

■

Swing must retail for $15 or less

Scope of Design

Electronics to be redesigned

• New micro-controller
• New controls
• Power circuit
• Design new Printed Circuit Board

Make swing motion more reliable

• Better control of swing speed
• Better motor reliability

Music

• Pre-programed as well as iPod connection

Our Design

Motion

• Solid Electromagnet Solenoid Motor

System Control

• Microcontroller: Launchpad Arduino

Music

• Pre-programmed music via SD card
• iPod connection via Breakout
• Volume amplification and control

Power Circuit

• Takes care of system’s electric power distribution

Block Diagram

Carousel Micro- Controller (Arduino) iPod Motor Speed Controller Speaker Volume Control Power Circuit Wall Socket

Motion-Stage 1

Solid Electromagnet Idea

• Attracts to pull swing and then releases
• Switching On/Off

Testing

• Magnetic field
• Force

Result

• Heat
• Small magnetic field

Motion-Stage 2

Solenoid

Idea

• Push swing
• Switching On/Off

Testing

• Force
• Power

Result

• Heat
• Not enough force
• Not matching the specs

Motion-Stage 3

Brushless DC motor Idea

• Replace brushed with brushless/stepper motor
• Use gear box for motion

Testing

• Swing motion
• Power

Result

• Stable
• Swing motion
• High pitch sound

System Control

Microcontroller: Arduino UNO

• 16 MHz CPU
• PWM, Digital, Analog pins
• More libraries and Community support

Microcontroller’s function

• Controls the swing’s speed
• Reads user input and changes output

accordingly

Electric Speed Controller (ESC):

• Electronically generated 3 phase electric power

30A ESC

Power Circuit

Designing the Circuits

• Keep the power loss to minimum
• Voltages need to be brought down in order to

meet each component’s voltage requirement (circuits 1,3 and 4)

• Replace voltage dividers with linear voltage

regulators (eliminates excessive resistors)

• Linear voltage regulators are also known for

their efficiency, if designed right

Designing the Circuits

Power loss in a voltage regulator

• Ploss = (Vin-Vout)*Iout

Solution

• Keep Vin-Vout to minimum
• Use “low” VDROP voltage regulators

In addition

• capacitors were used in the circuits for transient

performance and to reduce voltage deviation

Circuits

Circuit 1 (C1)

Circuits

Circuit 2 (C2) Circuit 3 (C3)

Circuits

Circuit 4 (C4)

Power Analysis

Maximum Power Consumption ≈ 10W

Components Voltage(V) Current(A) Power(w) Microcontroller 3.6 0.00142 0.051 Motor 6 0.7 4.2 Ipod dock 5 0.5 2.5 Sub-motor 3 0.1 0.3 Vreg-C1 1 0.00142 0.00142 Vreg-C3 1 0.5 0.5 Vreg-C4 3 0.1 0.3 Volume circuit

• 2

Music

iPod Dock

• Play music
• Charge iPod

SD card reader

• Play stored music

iPod Charging Circuit (#) refers to pin on dock

Music from SD card

• Use the Arduino to

read music from the SD card, through use

• f an adapter.

Music

Volume control & amplification

500mV 2.4V(max)

User Interface

• iPod Dock
• Power Controls
• Carousel Controls
• Music/Volume Controls
• Motion Controls
• Speed Read Out (1-3)

Progress This Semester

• Swing Motion

○ Three different speeds

• Music

○ Play music from iPod ○ Play music from SD card

• Designed power circuit
• User interface design

Skills Gained

• Programming microcontrollers
• MultiSim/Ultiboard design
• 3D modeling/Rapid Prototyping

○ Autodesk Inventor

• SD card reading

Projected Cost (PCB Parts)

Project Cost (Total)

Item Individual Cost Bulk Cost Motor $15.95 $2.00 (5,000+) PCB $50.00 $3.92 (15,000+) PCB Parts $36.03 $2.47 (100,000+) Arduino $15.00 $7.87 (100+) iPod Dock $14.99 $0.3 (10,000+) Total: $16.56

Questions?