Wireless Temperature Sensor
Detail Design Review
Outline
• Bill of materials• Electrical Schematic• Programming• Circuit Schematic• PCB Board• Test Stand• Test Drawing• Theoretical Results• Fabrication Timeline
Bill of MaterialsPart Quantity Vender Total Price
22K Resistor 10 Digi-Key $ 0.38
4.7K Resistor 10 Digi-Key $ 0.38
Terminal Block 3 Digi-Key $ 10.50
10 K Resistor 10 Digi-Key $ 0.38
Header 9 Digi-Key $ 18.09
0.1uF Capacitor 30 Digi-Key $ 1.14
Battery Holder 3 Digi-Key $ 4.65
Lithium Battery 15 Mouser $ 41.55
PCB Board 4 Express PCB $ 75.00
Zigbee Kit 1 Max Stream $ 275.00
CJC Chips 12 Newark $ 153.84
RTV 1 $ 79.99
RTV Primer 1 $ 39.99
Thermocouple Wire 25 ft Omega $ 31.12
Circuit Schematic
Programming
• Shift in SPI data to internal pic memory
• Assign Data a CJC ID
• Divide temperature data by 4 to change to correct 0 to 1024 C resolution
• Output Temperature, CJC ID, and open circuit data using asynchronous serial.
PCB Layout
PCB Completed
Test Stand
Solidworks Model Final Model
Base
Holding PlateFor 4” x 4.5” Brick
Holding PlateFor 2” x 2” Brick
Locking Ring
Test DrawingCircuit
Spacers
Bracket
TPS
1-D Heat AnalysisHeat Shield Temperature Over Time
0
100
200
300
400
500
600
700
800
60 90 120 150 180 210 240 270 300 330
Time (sec)
Te
mp
era
ture
(C
)
.25 in.
.75 in.
1.25 in.
1.75 in.
Temperature Through Heat Shield After 3 min.
0
200
400
600
800
1000
1200
Depth Into Heat Slield (in)
Tem
pera
ture
(C
)
1. Semi-Infinite Solid2. Temperature of heated surface of brick is uniform at
1000 C3. One-dimensional conduction through brick4. Properties of FRCI-12 Rigid Tile are uniform at all
temperatures5. Initial Block Temperature is 20 Degrees C
Assumptions
FEA AnalysisTemperature Profile After 3 min. of Constant Surface Temperature
Fabrication Timeline
Questions
Production BudgetPart Quantity Price Per Unit Total Unit Price
22K Resistor 1 $0.04 $0.04
4.7K Resistor 1 $0.04 $0.04
Terminal Block 1 $3.50 $3.50
10 K Resistor 1 $0.04 $0.04
Header 3 $2.01 $6.03
.1uF Capacitor 10 $0.04 $0.38
Battery Holder 1 $1.55 $1.55
Lithium Battery 1 $2.77 $2.77
PCB Board 1 $18.75 $18.75
Zigbee 1 $23.20 $23.20
CJC Chips 4 $12.82 $51.28
Thermocouple Wire 1 $2.48 $2.48
Total $110.05
*High prices due to not ordering in mass quantities.
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