Lookup table Sine Wave Generation

 

Sine Wave Generation using PIC 16f84A :

In this lesson, we ‘ll learn to use the PIC 16F84A to generate a sine wave signal using lookup table method .

These are pre-calculated values of a certain signal ( here will be a sine wave ) , then the signal is transmitted at execution time . You can consider this an inverse process of the digitization . At execution time, the signal is sent to the output port of the Microcontroller at the rate you determine. You then get the original signal.

Attached a text file that explains how I calculated the values.

The hardware circuit is very simple. It is called Resistor Ladder Network.

When you configure and run your program , you should get an output signal like this

You can get the circuit for Proteus ISIS 7 and the code from here.

If you need any help for configuring the simulator , check my older posts.

You can also contact me directly if you need any further help.

3 Comments

  1. hi hugo,

    in the lookuptable
    u say

    we add half this value 128.

    128
    150.2269667
    171.7785783
    192

    how do u get these figures?

    add 128 to what numbers?

    Thanks

     

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