I need to build a robot on a ball (ballbot). I need some help.
Welcome to the forum
How far have you got with the project and what do you need help with ?
What is your Arduino and electronics experience ?
Hey there,
Thanks for responding.
I am advanced in Arduino. We don't have any proper tutorial or reference in creating this ballbot. So, we just seeked help from the forum. 
Have you tried searching the Web, or even the forum ?
Yes we have tried but the problem is with there is no proper explanation or tutorial
we need to understand the working
Start by describing in English how you think the robot should work
For instance, how will the Arduino know that the robot is not currently balanced on the ball and what actions need to be taken to put it back in balance.
Really? Why did you not create one?
Really? First hit showed twenty patents dating back to 1997. Two degrees off that list of hits were designs.
Really? How is this a problem that someone else did not do the work?
I would guess you became interested in life-like machines, and seeing this (ball balancing robot) intrigued you. It intrigues me. How does the robot know it is tilting off center? How are the combination of wheel movements driven to move the ball underneath the robot? How much theory went into driving a sphere circularly to create horizontal movement? How many prototypes were sacrificed to get the robot stable at the zenith of the ball, to overcome momentum of a rolling object with an unbalanced top-weight. What properties of an inverted pendulum effect dynamic stability? Did LEGO(tm) literally get the ball rolling for ballbots?
Stay interested. Stay curious. Keep learning. But, you are not advanced, you did not search, you want a toy to be given to you.
The usage of "we" lets me think of a school project. Is it?
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