eardrum VS haven

Here's a 24/7 background audio recorder app I made for Android. The impact on battery and storage is surprisingly reasonable.

https://github.com/miguelrochefort/eardrum

I found this https://github.com/guardianproject/haven which has the right features but looks like the project is abandoned. The app can not be installed on my Pixel 7, is not supported.

Haven, available either on F-Droid or Google Play.

Haven might be what you are looking for. It can activate sound and video recording upon noise, light and vibration. It is in the IzzyOnDroid Repo or has its own repo. Check the project page: https://guardianproject.github.io/haven

How does this compare to https://guardianproject.github.io/haven

This might be useful: https://guardianproject.github.io/haven/

Even better is something like the Guardian Project's Haven(https://github.com/guardianproject/haven) which IIRC Snowden contributed to.

It's incredibly cost-effective to just buy an old Android phone (which comes integrated with multiple microphones, with good signal processing and noise cancellation), instead of building it with components.

Haven is specifically designed for intrusion detection, and for preventing people from tampering with your laptop for instance by detecting activity on the Android phone's sensors.

Project Website and Play Store

Adding to what the other commenter said, you may want to check this app: https://github.com/guardianproject/haven

Haven( GitHub ) from the guardian project: it's a good open-source motion detection app.

You could retire it to a personal surveillance camera with haven (needs a sim for registration though). With root, you could even set a charging limit so the battery doesn't die.