For a purpose of getting a well-understand for the effects of feedback control, there exist several types of the experimental equipment. One of them is a ball and beam system, by which the stabilizing control method for single input single output system can be learned, because it can directly show the effect of control as the balance of beam and location of the ball to target position. In this report, the development of simple experimental equipment of ball and beam using an Arduino compatible micro-computer is described. The advantage of the developed experimental equipment are （1 ）small size, (2) low cost, and (3) ease for construction.