Abstract:
A PIC microcontroller is a main processor to generate
four types of waveforms. This device has two channels
output which not only provides user’s editable
waveform (sine, square, triangular, sawtooth etc) but
also indicates user’s frequency. The waveform
synthesis is based on the Direct Digital Synthesis
(DDS) technique to provide high stability and
accuracy. The synthesized digital values at the port of
the microcontroller are converted to an analog
waveform by an 8-bit DAC. This signal generator can
generate Sine, Square, Triangle and Sawtooth
waveforms. It can operate standalone or with a
personal computer (PC). A dot-matrix LCD is used to
display the information about the waveform and the
frequency selection. The type of waveform and the
frequency selection can be selected from the embedded
keypad or PC. The waveform table can be uploaded
from the PC to the generator. The generator stores the
received waveform table in the FLASH memory and
uses it to generate waveform.
