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 Power Wall Circuit Socket Speed iPod Controller Micro- Carousel Controller (Arduino) Motor Volume Control Speaker
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 ● P loss = (V in -V out )*I out Solution ● Keep V in -V out to minimum ● Use “low” V DROP 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 of 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
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