See also: MikroKopter-Boards
The Flight-Ctrl is the main board of the MikroKopter. Without this you can not fly the MikroKopter.
All for flight required sensors and the microcontroller are on the FlightCtrl.
There are 6 versions of Flight-Ctrl: V1.0, V1.1, V1.2, V1.3, V2.0 (ME) and V2.1 (ME). There are only small differences between versions 1.0 and 1.2.
A description of each FlightCtrl versions can be found here: