Building the keyboard couldn't be easier. First layout the keys as follows, using whatever switches you prefer.

[delete] [3] [2] [1] [4] [5] [6] [enter]

                     [space] 

Then connect one pole of each of the switches to ground on the teensy and the other pole of each to the following pins.

deleteKey = 2;
enterKey = 3;
spaceKey = 4;
Key3 = 5;
Key2 = 6;
Key1 = 7;
Key4 = 8;
Key5 = 9;
Key6 = 10;

And that's it.

To configure the keyboard you can use any PC, then the braille keyboard can be used on any usb compatible PC or MAC. Install the arduino ide from arduino.cc , well as teensyduino from www.pjrc.com/teensy/teensyduino.html. Open the source code included on this page, and under the tolls tab select the board type, select USB type "keyboard" and the keyboard type for your region. This code is only compatible with English speaking regions as other countries use different braille standards. Click the right pointing arrow ➡️to compile and upload the firmware to your device.

Once the code is uploaded to the device, the keyboard is plug and play. Just conect the usb lead and you are ready to go :)