  We show how to control the movement of a wheeled robot using on-board liquid
marbles made of Belousov-Zhabotinsky solution droplets coated with polyethylene
powder. Two stainless steel, iridium coated electrodes were inserted in a
marble and the electrical potential recorded was used to control the robot's
motor. We stimulated the marble with a laser beam. It responded to the
stimulation by pronounced changes in the electrical potential output. The
electrical output was detected by robot. The robot was changing its trajectory
in response to the stimulation. The results open new horizons for applications
for oscillatory chemical reactions in robotics.
