The brain-controlled prosthetic leg involves the technique of using the brain waves to control the motion of a prosthetic leg. The brain waves are obtained using a device called Mindwave. This device captures the complex brainwaves through the analysis of electroencephalogram power spectrum. The brain signals are then further processed using an Arduino microcontroller which then drives the motors to control the motion of the prosthetic leg. Through this approach, the natural motion of human leg can be regained using prosthetics at a very low cost.