However, Arduino also offers this board without headers ... You'll notice a difference between the SPI and I2C/TWI pins, as well. On the Nano, the SPI pins are on digital pins D10 to D13, and ...

For those worrying that [Faransky] is relying on the PWM functionality of the Arduino Nano to generate waveforms ... an interface to control it over SPI. Unfortunately, the AD9833 doesn’t ...

Not according to [techtoys], who has created an Arduino shield that creates an HDMI output from an SPI control input. This is a project that seems to have been around for a couple of years ...