Both the Force Trainer and Mattel MindFlex use a daughterboard from
NeuroSky that outputs serial data for values of ‘Wireless link’,
‘Attention’ and Meditation. Both of these devices have the same
NeuroSky board, so the *easy* hacking instructions work for both.
It’s really as simple as soldering a wire to the Tx on the NeuroSky
board to Rx serial on an Arduino. And solder ground on the NeuroSky
board to ground on the Arduino.
The Arduino Brain Library and the version using the SoftSerial can be downloaded from Github.
What’s your hackerspace working on?