robotic arm with IR vision

hi...
i am trying to make a simple robotic arm with infra red vision ,,,,as my final yr project.
the arm would be having a rotatory base(360 degree movement),and the basic arm movements like shoulder,elbow and wrist.with a gripper...which will be having an ir transmitter and reciever.i will place the arm on ir absorbing base...and wen it will transmit ir it will be reflected only by objects placed on base.thus i want the arm to pick these objects and place them at center axis.

MY PROBLEM IS THAT i dont have the circuit diagram...i need help...
any kind of help is appreciated.

The point of a final year project is to THINK UP THE CIRCUIT YOURSELF. Or find it yourself through research at the very least.

Here's a clue. Try not to think of it as a "robotic arm with IR sensor circuit". Try to think of it as a circuit with a computer that can read data from the IR sensors as well as send commands to the arm.