We've released an app for Android that tracks the user's behaviour when entering a pre-set PIN. You can find it here: https://play.google.com/store/apps/details?id=com.idenux.invisilockexperiment

We will track behavioural features such as typing speed and pressure, along with geolocation. There are more details in the application description.

Any participation and feedback on the app and approach in general is greatly appreciated. Thank you for the help!