outer dimensions
DESCRIPTION
Outer Dimensions. Weight of Components. Heat Analysis – Hand Calculations. Conduction caused by air: Section of chip 0.1” x 0.1” A=6.45*10 -6 m 2 Q= -KA ( dT / dx ) Q Total =1.6W Q Part =1.6W/210 = 0.00762W K= (about) 0.0257 Wm -1 K -1 dT / dx = Q/(-KA) - PowerPoint PPT PresentationTRANSCRIPT
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