I use Home Assistant as the backend for my annual decorations and Tasker on android for the interface that trick or treaters use.
Pandemic and all this year the show will be voice controlled. Here are videos over the years:
2018 - https://www.youtube.com/watch?v=OkRkp--gZ4A
2017 - https://www.youtube.com/watch?v=Ht87YbZnutk
2016 - https://www.youtube.com/watch?v=V8IzGjgJBTs