As said a Brain Machine is composed of 3 main parts which could be considered completely autonomous (from the electric point of view).

The previous picture shows as the system functions: the computer provides a digital 8-bit output via the standard parallel port. The way of the arrow indicate that there is no handshaking. A train of digital TTL impulses are generated by the software which uses the hardware of the computer. To the parallel is attached a power interface that boost the TTL signal to drive one or more LED.

There are two tecniques to drive a LED: 1. using a polarized transistor; 2. using a TTL buffer integrated circuit. B-Storm was developed with the first mode, while CyMEX with the second. This one gives a more compact solution and less problems about the tolerance of the polarizing resistances.

PROJECT PURPOSES:

With this structure we can get a blinking set of LED that spot light over the eyelid of the subject. This induces a stimulation that drives the brain to be 'followed'. According to feedbacked studies over Light stimulations we know that starting from a base frequency of 12Hz (Alpha) and shifting over, downwards or upwards, the brain seems to join the shift, in a resonance frequency.