The sensing system for obstacle avoidance uses a
combination of proximity and tactile sensors. Photoelectric
sensors are placed on each side in order to realize the robot’s
overall proximity sensing. Safety airbags are placed around
the lower part of the robot. The air pressure in airbags changes
which is detected by the connected high-precision pressure
sensor. In Fig.7, the robot uses the proximity sensors to
explore the near objects that may obstruct robot, while tactile
sensor perceives the external collision of robot.