Energy harvesting is extracting energy from ambient sources. Vibration is one the energy source available freely in surrounding environment. Research on vibration energy harvesting have received the attention of many researchers to power wireless sensors and low-power electronic devices from smart materials. In this paper, the effect of PZT-5A and PZT- 5H piezoelectric material on the cantilever beam mounted with tip mass and oriented at 100 , at the resistance of 1500 ohms is studied. MatLab program is developed considering the Euler Bernoulli beam assumptions, constitutive equations of piezoelectric material and Hamilton’s principle. The MatLab program is validated with the previous work on orthonormalisation electromechanical finite element unimorph beam and good agreement is obtained.