This paper presents a microprocessor-based simulator used in the study of wind speeds in a model building. A 7mx5mx5m room has been used as a model building to study the wind speed as the 70cmx1m chimney (with a 30cmx1m ventilator) is placed at different positions on the roof. The size of the window is 2mx3m. The height of the chimney is 12m from the top of the roof, or 17m from the floor. The position of the ventilator is changed, and the resulting wind speed is displayed on seven-segment displays in decimal format. Detailed schematics along with relevant flowcharts and the code for operating the simulator are also included as part of the paper.