At the heart of the device is a AD9833 waveform generator; with the Arduino, rotary encoder, and 16×2 LCD ... uses a X9C104P 100KOhm 8-bit digital potentiometer as a voltage divider on the ...

The FPGA communicates via SPI with an Arduino master controller ... mixing video or music, these encoders might be useful to any project where a standard analog potentiometer isn’t accurate ...