Zoombak A-GPS Universal Locator Guía de usuario descargar pdf (Pagina 13)

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2-3 days for final construction

2-3 days for testing of finished product

1-2 days for trouble shooting finished product

G-5 Options considered

Many different design implementations were considered for the subsystems. After much

research and comparing designs against products found on the market a final design was decided

upon. Upon first thoughts an FPGA was considered for the control circuit but due to size and

power requirements this idea was discarded in favor of a simple finite state machine constructed

of logic gates. The design was created and when implementation began it was found that an

EPROM would be a more logical choice because it removes the issue of propagation delay as

well as lowering the power requirements further. The locking mechanism was first designed to

be a clamp that ran through the spokes on a tire. This design would be user activated by placing

the bike down on the lock. This also would have kept all of the components in one container.

The issues with this would be that the size and weight would be so much that it could create an

issue while riding. The second design was a small pin that would lock into the gears on the

chain. This would keep the locking mechanism very small but brings in safety issues of if the

lock were triggered while riding. The final design (found in appendix _) consists of 3 parts; the

electric lock, the key cylinder, and a locking cable. The cable is removable from both ends for

safety and storage purposes. The tracking mechanism that was proposed was to be designed

from a microcontroller, a GPS shield, and a GPRS shield. The size of the tracker would be large

and the programming needed is out of the scope of work so a GPS tracker was upon. Two GPS

trackers were inspected and the Zoombak A-GPS tracker was decided upon due to its user

friendliness and long battery life.

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Zoombak A-GPS Universal Locator Guía de usuario Pagina 13