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The principal objective of this project is to design a low cost microcontroller based function generator which can generate sine wave and square waveforms and the frequency of the wave will be calculated and then displayed through LCD.


Function generator is a electronic equipment used to generate different types of electrical waveforms viz. sine wave, square wave, triangular wave & sawtooth wave over a wide range of frequencies. It is used in development, testing and repair of electronic equipment.

In our project we are using LM324 IC to design the function generator circuit and 89C51 microcontroller as a frequency counter of the square waveform. The calculated frequency will be displayed through LCD. Here we are generating only the sine and square waveforms.

We are well aware of the fact that a function generator is not a new concept. It is widely used in the industry and is available in the market. But our innovation lies in the fact that we are designing the circuit at an extreme low cost with the output being as accurate as the costlier ones. Our project will be very useful for lab experiments.