[@mmc_milad]

There’s a project called [ Nailz](https://blog.arduino.cc/2020/05/04/control-your-smart-devices-with-touch-sensitive-fingernails/) which enables using your fingernails as input for computer or smartphones.

Video : [Nailz: Sensing Hand Input with Touch Sensitive Nails](https://www.youtube.com/watch?v=GCGYb0u4NGM)

Here is the paper by the team that created it : [Sensing Hand Input with Touch Sensitive Nails](https://dl.acm.org/doi/fullHtml/10.1145/3313831.3376778)

This could be a good start for this project idea.