[Tutorials] How to integrate your car's HomeLink buttons into your HA system

[electron]

It seems nowadays, most modern vehicles have HomeLink or Car2U - those three little buttons designed to integrate with your garage door openers and gates. Also, the majority of houses in america have only one, maybe 2 garage doors - so there's almost always a spare button or two.
 
Have you ever wondered how you could very easily integrate those extra buttons into your Home Automation or Security system?

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[rwarshawski]

Any other developments?
 
bob