Zoombak A-GPS Universal Locator Guía de usuario Pagina 20

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13 | P a g e
P-3 Cost to Implement Prototype
Cost Analysis - Prototype
Part
Number
Vendor
Price (per item)
Cost
1-kΩ (1/4 W) Resistor
2
Radioshack
$1.19 (5-pack)
$1.19
1-Ω (10 W) Resistor
1
Radioshack
$1.21
$1.21
Small Sink PC
1
Radioshack
$2.49
$2.49
5-Volt Lamp Relay
2
Radioshack
$4.69
$9.38
5-Volt Regulator
2
Radioshack
$1.99
$3.98
2222 A NPN Transistor
1
Radioshack
$2.99 (15-pack)
$2.99
100-Ω (1/4 W) Resistor
2
Radioshack
$1.19 (5-pack)
$1.19
Battery
1
Walmart
$29.99
$29.99
Adjustable Voltage Regulator
2
Radioshack
$3.49
$6.98
12-Volt Reed Relay
2
Radioshack
$3.49
$6.98
Printed Circuit Board
2
Radioshack
$2.49
$4.98
Total
$71.36
Table P- 1 Cost analysis of prototype
P-4 Time to Implement Prototype
1 week for designing power system
1 day for obtaining parts and setting up for construction
1 day for construction
2-3 days for testing and troubleshooting system
C Control Circuit (RD)
C-1 Technical Summary
The control circuit for the CABL is used to control when and how long the alarm
is active. To do this a finite state machine (FSM) is necessary. This FSM would need to take
external inputs "Arm" and "Disarm" from the key fob subsystem, and an input from the
accelerometer subsystem. In addition to this the FSM also needs a counter in order to control the
length of time the alarm will sound without the user deactivating it. For the prototype a Spartan 6
FPGA was first considered to implement such a circuit but was discarded when we discovered
that it required 20 watts of power simply to keep its programming. Because a FPGA was out of
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