Haha, get it? Because sound = waves = surfing
This is a signal-processing board I made for my robotics team to solve the hydrophone problem. Unfortunately, it was had a few electrical problems, which I fixed, and a few software problems, which I couldn’t fix. (Either the DMA or the SPI on the microcontroller would randomly read data with a 1–2 bit framing error, outputting garbage as a result.)
I wrote a painfully detailed report (PDF) on it as documentation for future robotics team members, which I also turned in for credit on my AP Physics final project.