Finally, here are the parts used for our simple prototype.
Our device is able to “display” two characters on two braille cells from Metek. It is connectable with any computer using an USB port, thanks to the Arduino platform the device can communicate with the host computer to ask for characters to display at the right position.
The navigation interface consists of a proportional joystick and two buttons.
Basically this prototype can run easily from a Linux platform. Because it is not easy to “see” the braille cells I’ve added two LEDs matrix to display the result.