I am lazy (so i built a Homelink ..link to my zwave gateway)

everything shoved into receiver case.  and i mean SHOVED in

pi, step down voltage regulator, receiver

MultiCode garage door receiver (300mhz) https://www.amazon.com/gp/product/B00CAB62C2/
MultiCode garage door remote (to program the car)
Obligatory rpi 3
step down voltage regulator (receiver is 12v, step down to 5v)
Homelink enabled car
10 lines of dirty node js

not having to pull out my phone to turn on/of my home alarm?

priceless