Here is the underlying part of the robot.
This is just a simple three-wheeled vehicle that is connected with the arm the two motors and intelligent block. One of the tires is made to the caster.
It also appeared this three-wheeled car on the book called "gray book", if you are interested please read (advertising).

And, an ultrasonic sensor as robot eyes.

This is a part of the hand of the robot. Using two 16 teeth gear, but to be able to open and close your fingers from side to side.

It looks like a combination of all. Hardware is now complete.

Please connect the cable as follows.
Port A: Motor of the right tire
Port B: Motor of the left tire
Port C: Motor of the hand
Input port 1: Ultrasonic sensor

This robot can not grab heavy objects, I tried to provide a paper cup. I will try to make a program like this grasp the cup.