From BCI

Addressed problems

delivering stable simulation frequencies for SSVEP -- especially higher frequencies are unstable on a standard computer screen, especially when controlled by a non-real time (that is standard) operating system. Therefore, hardwired fixed setups (e.g. only for dialing numbers) or ATM-like approaches have been used so far.
price, stability and TCO of systems consisting of separate: general-purpose computer, generator and LED boxes.

Solution

Scheme of the appliance: front (blue) standard LCD screen. Middle (green) boxes separating the array of LEDs (in this case 9). Back (grey) -- electronics for a complete PC with BT and WiFi, and the controller for LEDs.

Solution proposed by Piotr Durka consists of:

LCD screen backlit by an array of LEDs,
each LED is backlighting an area of the LCD delineated by the boxes containing LEDs
in the box: electronics of the LED controller, standard PC with BT, WiFi and USB interfaces

First two prototypes were implemented by the team includng Andrzej Suda, Rafał Kuś, Krzysztof Kulewski and Magdalena Michalska. Both prototypes share the same basic principles of operation:

possibility of implementing cost effective solution with GNU/Linux based JeOS and OpenBCI software,
communication with an EEG amplifier: BT or USB,
communication with external devices: WiFi.

.

The first prototype: PC board Via with quad-core CPU was selected for an abundance of computing power. Integrated generator driving 9 LEDs, delivering square stimulus with selectable duty cycle. 3x3 array of green LEDs behind 1024x768 LCD. Communication with EEG amplifier via BT, commands (to the robot) sent over WiFi.

Second prototype: battery powered compact unit, with optional USB keyboard and mouse for quick maintenance (in general, the maintenance, including e.g. signal display, will be delegated to an external laptop), on/off button and intensity control.