Wireless Temperature Sensor Detail Design Review.

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.