There is a lot of availability of mechanical energy in the environment. This mechanical energy can be converted into other form of energy like electrical energy. Here we developed a pendulum motion based power generator that sustains its motion with low maintenance providing voltage output peaks from a reciprocating mechanical structure. The reciprocating effect of our device is enhanced by using gear mechanism that is composed of shaft with a dynamo. We demonstrate lighting up a commercial LED light bulb by harvesting mechanical energy of the pendulum oscillation. This paper is a platform of developing a sustainable, low maintenance system to generate electrical energy.