Other than low-cost, his list of requirements was as follows: Dual sine wave output, synchronized Frequency, Amplitude, and Phase control Low ... your own DDS using discrete ICs or in an FPGA ...

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 ...

This simple serial RS-232-to-discrete-output application and ... auto-baud function, and output registers. Graphic control written in Visual Basic (VB) gives this implementation a Windows-based ...