This is a simple, cut-down library to get the AD9833 up and running as a signal generator. It provides an initialisation function and then a function to set the frequency and waveform.
- The project was based on a more comprehensive library here: https://github.com/Billwilliams1952/AD9833-Library-Arduino
- AD9833 datasheet here: http://www.analog.com/media/en/technical-documentation/data-sheets/AD9833.pdf
Download the ZIP file and extract it to the Arduino/libraries folder. Open the Arduino IDE, click File-Examples-AD9833_test.
| AD9833 Pin | Arduino Pin |
|---|---|
| CLK | SCK |
| DAT | MOSI |
| FNC | Any digital pin (default D4) |
| VCC | 5V |
| GND | GND |
| REF | NC |
There are only two functions required to initialise and then control the device and generate a simple output signal.
First instantiate the AD9833 object and select a function pin for SPI communication control:
#define FNC_PIN 4
AD9833 ad9833;
Initialise the chip in the Arduino setup() function:
ad9833.begin(FNC_PIN);
Within either the setup() or loop() functions you can then tell the device to start generating a signal:
This method accepts a waveform type of either SINE_WAVE, SQUARE_WAVE, or TRIANGLE_WAVE, and a frequency in KHz.
ad9833.setFrequency(waveType, frequencyInKHz);
That's it. The device should now be generating the requested signal.