outer dimensions

Outer Dimensions

ComponentLength (in)

Width (in)

Height (in) Inch cube

Main Case 2.91 2.25 1.38 9.04

Component Diam (in)Height (in) Inch cube

Side Case 0.5 1.2 0.197

Components Inch cube

Total Volume: 9.44

Weight of ComponentsComponents Weight (oz)

Microcontroller -

Reader 0.441

Keypad -

Magnetometer 0.028

Battery 0.770

Side Motor 0.229

Side Motor 0.229

Middle Motor 0.060

Case Total 1.34TOTAL: 3.07

Heat Analysis – Hand Calculations

Conduction caused by air: Section of chip 0.1” x 0.1” A=6.45*10-6 m2

Q= -KA (dT/dx) QTotal=1.6W QPart =1.6W/210 = 0.00762W K= (about) 0.0257 Wm-1K-1

dT/dx = Q/(-KA) dT/dx = 0.00762/(0.0257*6.45*10-6) = 45969 degC/m

=649 degF/in =64.9 degF/0.1in

Chip

Air

Heat – Experimental Results

0 5 10 15 20 2580

90

100

110

120

130

140

Chip Temp (deg F) Case Air Temp (deg F)Time (mins)

Null hypothesis: Average temperature < 120 deg F

95% ConfidenceAlpha = 0.05Mean=113.9P-Value=1.00

Fail to reject null hypothesis

Heat – Analytical AnalysisCase thermal conductivity = 0.2 Wm-1K-1

Outside case temp set to 20 deg F

Top of chip set to 130 deg F

Bottom of chip insulated

Schematic of Build (outer case)

Schematic of Build (Battery)

Schematic of Build (RFID)

Schematic of Build (PCB)

Schematic of Build (Keypad)

Schematic of Build (Cover)

Schematic of Build (Motor Case)

P12015: Bill of Materials

Type Part Manufacturer Manufacturer Part # Quantity Unit Price Shipping Cost Total Cost ($)

Component900 MHz 8 dBi Flat Patch Antenna - 4ft SMA Male Connecto L-com Global Connectivity HG908P-SM 1 $54.99 $10.95$65.94

ComponentPrecision Haptic 10mm Vibration Motor - 15mm Type model 1 Precision Microdrives 310-001 3 $7.56 $22.68

ComponentPrecision Haptic 10mm Vibration Motor - 15mm Type model 2 Precision Microdrives 310-002 2 $7.56 $15.12

Component Pico Vibe 12mm Vibration Motor - 3.4mm Type Precision Microdrives 312-101 1 $6.48 $17.97$24.45

Component3D Compass and Accelerometer Carrier with Voltage Regulators

Pololu Robotics & Electronics LSM303DLH 1 $19.95 $19.95

Component LSM303DLH Tilt Compensated Compass Chip ST Micro Electronics COM-09757 1 $6.95 $3.86$10.81

Component Polymer Lithium Ion Battery - 1000mAh Sparkfun Electronics PRT-00339 1 $11.95 $11.95

Component 16-Bit Ultra-Low-Power Microcontroller Texas Instruments MSP430F5438A 1 $12.13 $12.13

Component Small Keypad Futurlec Electronics KEYPADSM 1 $2.20 $4.00$6.20

Component SkyeModule M9 SkyeTek M9 V.080527

Component PCB 1 $300.00 $300.00

Component IC BATT CHRGR LI+ 1CELL MAXIM MAX1555EZK+TCT-ND 2 $2.37 $4.74

Component IC REG LDO 3.3/ADJ 500MA MAXIM MAX1818EUT33+T 2 $3.25 $6.50

Component IC USB FS SERIAL UART FTDI FT232RL 2 $4.50 $9.00

Case Rod, ABS, Beige, 1 In Dia x 1 Ft L Grainger 1ZBU6 1 $8.59 $8.59

Case Case RIT - 1.998 $10.00 $19.98

Total Cost: $538.04