BCI research can become an expensive endeavor. The price point may be too high for researchers and even prospective patients to afford. In addition, many of the systems that are currently used in BCI research turn out to be bulky and complex. This makes it time consuming to set up, and may prohibit lay persons from figuring out how to operate one.
Our research team has designed and tested an low cost, open-source BCI platform which uses a custom EEG amplifier array and an Arduino Due microcontroller board. The entire system costs about $300, and operates at a level similar to a 32-channel EEG-based BCI running off a desktop computer.
For those who are interested, the details of the circuit design and system can be found in our publication: http://ieeexplore.ieee.org/abstract/document/7851005/
The open-source software is available here: https://github.com/cbmspc/PortableBCI