DDS Library for The AD9835

Hello. Having bought one of the AD9835 breakout boards from Sparkfun (, the lack of a library to control it was rather noticable. As a result, I have decided to write one, called Synthesis.

URL: GitHub - LachlanGunn/Synthesis: DDS Support for Arduino

The intention is for this library to add support for other devices as I acquire them. API documentation is included in the library.

Usage Example:

 * Fixed-frequency sinusoid generator.
 * This example produces a 1MHz sinusoidal signal using the AD9835 class
 * from the Synthesis library.

#include <SPI.h>
#include "AD9835.h"

// We begin by creating the AD9835 object with the pin assignments
// that are used.  If another pinout is used, this must be
// modified.
AD9835 dds(
        7, // FSYNC
        3, // SCLK
        2, // SDATA
        6, // FSEL
        5, // PSEL1
        4, // PSEL0
        50000000 // hzMasterClockFrequency (50MHz)

void setup()
    // We must first set up all of our output pins.

void loop()

    // We then set the board to produce a 1MHz signal.
    dds.setFrequencyHz(0, 1000000);

    // Without modulation the choice of phase offset does not matter,
    // but we set it to zero for good measure.

    // Finally, we turn on the IC.