15hz staircase square wave using PIC18f8722

[sukhavsa]

Hi All

I am trying to genereate a low frequency- 15Hz staircase square wave using a PIC18f8722 development board along with a DAC (AD7840) which can be used in either parallel or serial input mode.

I am right now considering to implement it by changing the parllel input bits values at output port after a time delay 33ms.

Do you think this is a good way of doing it. Please suggest a method if this sounds crude.

Thanks

 

[Nigel Goodwin]

1Hz is incredibly slow, you could do it with any processor, you could almost do it with clockwork.

Have you considered an R"R ladder, just an opamp and a few resistors.

 

[Pommie]

What is a "staircase square wave"? If you mean a triangle wave then you will have to output samples at around 500kHz to get the full 14 bit resolution at 15Hz.

Mike.

 

[sukhavsa]

@Mike
a staircase square wave is a square wave superimposed on a ramp