To overcome the difficulties pertaining to painting the exterior walls, herewith we propose a fully automated wall painting system powered by a micro controller. The system has an movable overhead machine consisting of paint storage tank, air compressor to spray the paint, a display and keyboard interface to control the input operations. The overhead device clamped to the wall will be connected to a trolley carrying the spray guns. By automatically moving the trolley to the desired locations, the wall can be painted. And in order to paint irregular surfaces, the system can be enabled to work in manual mode.