A fan speed can be controlled by the multiple claps. Single clap to switch on, next clap for 2nd speed, 3rd clap for third speed and fourth clap to switch off. This is a complete, assembled working project / model (duly tested) at our work shop. This is a handmade project on a general purpose PCB and uses Electronics / Electrical components as per requirement of a particular model. A rough report & study material related to project will be mailed to student on request.