thank u i saw ur pics. but i need details for home built robot.
Depends on the size of the robot and what other tasks it needs to acomplish. There are several ways to build a stair climber. There is the jack type, the treaded type and the 3 star wheel type.
another thing is there is no vertical traction i.e.., vertical wall for the stairs this leaves me confused
Your question leaves me confused. I don't understand what you mean by vertical wall. If you mean side wall, no robot uses it for traction. If you mean the riser, you just have to sense it, not have traction on it. Probably if the robot size is very small, it needs to climb the riser like a wall.