Yes, this is basically advertising for some boards and keyfob remotes sold by Adafruit, but it’s still interesting that this can be done so inexpensively!

[youtube=http://www.youtube.com/v/NxLF0PtA1zM&fs=1&hd=1&autoplay=0] [youtube=http://www.youtube.com/v/vWB4OrKeSDE&fs=1&hd=1&autoplay=0]