PIC16F84_Variable Frequency and Amplitude Generator
This project is based on PIC16F84 Microcontroller. The system checks the variable
resistance value and modifies the amplitude and frequency of the square wave. To
simulate this circuit, initially activate Mixed Mode simulator from the
Schematic Editor window. Simulation can be performed by selecting Run Transient
analysis (Oscillograph) from Simulation menu.
This project includes PIC16F84, two variable resistances, ADC 0808, DAC AD8582,
and Buffer 74ALS245A.
The two variable resistances are for changing amplitude and for changing the
frequency of the square wave. Using the ADC 0808 both the values is read. DAC
AD8582 converts the digital value of amplitude and time to analog waveform.
Buffer 74ALS245A is used for switching ADC and DAC since we have only one 8 bit
The source code written in C language and can be viewed from the code editor
The source code has to be compiled after making any modifications (editing). Also
the code can be debugged during simulation.
2. Selects channel of amplitude ADC
3. Reading the variable resistance values from ADC for
4. Out the amplitude value.
5. Selects channel of time ADC.
6. Reading the variable resistance values from ADC for
7. Make delay based on ADC value
8. Display of varied frequency and amplitude in waveform