I’ve posted some interesting ways to actually physically see sound waves in the past, but here’s more scientific way done in a lab. The following videos are from the Naval Postgraduate Physics Department’s YouTube channel, which is dedicated to showing physics experiments. That’s cool enough by itself, but what’s even better is that a large number of these experiments are dedicated to audio topics, so it’s a great way to really understand the physics of sound from something other than a book.
In this case it’s an experiment built around a Helmholtz resonator tube filled with sawdust that illustrates not only harmonics, but wavelengths as well, two things that are important to every day recording life.
There are two videos (parts 1 and 2) that provide an excellent visual example of harmonic concepts. These videos aren’t too long, and are an easy view. That being said, here’s a great little Chrome plugin that I use all the time to speed up videos called Video Screen Controller. It helps you to get to the point just that much faster.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.