As hardware, we use the board developed in the Google Audio-to-tactile project as it has many useful features already installed (current sensing, ...). Instructions on how to obtain this board are found here.
The software we wrote for this board can be found here.
We have positive results for some users.
![Image](https://user-images.githubusercontent.com/18469570/245756643-6d37423f-a8d8-489d-8761-dce0398e5a9a.png)