this is default data format when use sample Arduino code. same as IBVA hardware.

one brain-duino board is 2 channel. stack two board makes 4 channel.

sample Arduino code always send 4 channel, even not use two brain-duino board.

　：

221     28f     22f     1d1

212     125     2b3     178

198     1f6     298     17a

281     0b3     17e     061

1a3     3fb     0b2     1bf

2de     1f4     11e     20d

21f     18e     15f     13f

259     2ea     186     1f5

　：

TAB (0x09) is channel separation

CR (0x0D) is end of one sampling for 4 channel data.

with sample Arduino code send total 16 byte 512 times par second.

use other sampling frequency need to modify Arduino code.

with IBVA Mac application support different sampling frequency including 512 Hz.

with BrainBay PC application support only 256 Hz sampling frequency. need to setup Arduino code work with 256 Hz.

each channel has

10 bit data

000 ～ 3ff

when unipolar input

000 is 0 V input

200 is 2.5 V input

3ff is 5 V input

brain-duino use high gain bipolar amplifier.

actual input voltage is followings.

bipolar input

center 200

000 = -100 micro V

200 = 0 micro V

3ff = 100 micro V