At the heart of the device is a AD9833 waveform generator; with the Arduino, rotary encoder, and 16×2 LCD providing an interface to control it over SPI. Unfortunately, the AD9833 doesn’t have ...

Arduino sent over one of the first ... you can see that there’s a few interesting I/O devices include SPI, I2C, UART, reading a quadrature encoder, and NeoPixel. There’s also a few headers ...