Haven is pretty neat in that it can be sound or motion activated.

I’ve used it in the past and it is definitely simple and comes from the guardian project (they used to be the tor repo folk)

However, it hasn’t seen an update in 4 years, so, it may have some issues(?) with newer os.

Haven: Keep Watch (Protect personal spaces and possessions without compromising privacy) https://f-droid.org/packages/org.havenapp.main/