automatic guided vehicle is base of any robotics system
which having sense to finding its position ...when any object comes infront of it then it change its postion move right or left or stop
that moment is defined by controller
as controller we can use anything like arduino,picax etc
thjere ae some sensor like a ultrasonic ,infrared , used for determine object which is front of it
now in morden day there are camera or webcam can be used which directly determine object by finding pixle
its having complex structure ultrasonic with arduino is easy way to perform certain task