Zoombak A-GPS Universal Locator Guia do Utilizador descarregar pdf (Página 19)

12 | P a g e

P-2 Explanation of engineering drawing

A simplified version of the power system was drawn using Expresspcb. This program

allows for the drawing and labeling of a complete circuit including sizes for production of a dual

sided, copper traced, printed circuit board. The green traces of the circuit board are the bottom

side of the board; these traces carry the positive voltage through to each component and allow for

signal processing of the signals from the RF receiver. The red traces of the circuit are the top

side of the board; these traces are the negative, or ground, of the power system. The ground

leads of the clock, counter, and accelerometer are run through a 1k Ω resistor to establish a

common ground with the rest of the system. Using the battery in the prototype the expected life

of the system while active is solved simply by the equation:









 

Where A

is the current rating of the battery, A

is the current draw of the active system, and L is

the life expectancy of the system while active. The expected life of the system is then:

2200mAh/480mAh= 4.58 hours without taking into account the alarm going off, or disarming

the locking mechanism.

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Zoombak A-GPS Universal Locator Guia do Utilizador Página 19