In this paper, a general classification of the
modular robots is proposed, based on their topology and
the type of connection between the modules. The loco-
motion capabilities of the sub-group of pitch-yaw con-
necting robots are analyzed. Five different gaits have
been implemented and tested on a real robot composed
of eight modules. One of them, rotating, has not been
previously achieved. All gaits are implemented using a
simple and elegant central pattern generator (CPG) ap-
proach that simplify the algorithms of the controlling
system.