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Okay, let me show you another way to do it.
Okay, you get that downloaded and notice.
If you are unfamiliar with installing an Arduino library, here is an excellent tutorial on the subject.
It would probably be cheaper to buy components as I need them for my projects, but I like the convenience of a starter kit.
Here is a link to the website library.
This code is very similar to Brokking's code, however we adapted it and corresponding wiring to work with the Mega.
Then, attach the key case to the vehicle you want to track.