Music is particularly mathematical, so it’s no surprise that many creators turn to creating their own. Raspberry piesolutions based on musical problems. Today, we have a cutting-edge and determined creation to share from designer Guyrandy Jean-Gilles. Tired of twisting his ankles, Jean-Gilles chose to develop his own Raspberry Pi Pico powered automatic guitar tuner.
The design of the project is inspired by the Roadie 3 automatic tuner from Band Industries. However, Jean-Gilles’ creation is housed in a custom 3D printed shell and is built from the ground up for a more affordable end product.
Jean-Gilles was kind enough to publish the project in open source for anyone interested in recreating it. He provided a full parts list of everything you need to get started with the exception of the 3D printer and filament for the case. The tuner is built on a Raspberry Pi Pico. To turn the pegs, it uses a GM11a DC motor. An electret microphone (specified by Jean-Gilles with adjustable gain MAX4466) is used to listen to the string as it is tuned. You will also need a button, an 8-way rotary swing, an L293D double H-bridge, a few LEDs and an Adafruit Powerboost 1000c module.
Users place the tuner directly on the peg for the string they want to tune. Holding down the button on the tuner will activate the microphone. When the string is plucked, the tuner automatically rotates the peg until it determines that the tone of the string is tuned and triggers the LEDs to flash green.
We often say that the best Raspberry Pi projects are the ones you can do at home, and this is definitely one of those projects. To take a closer look at how this Pico-powered automatic guitar tuner works, visit the official project page on GitLab. There you will find all the source code as well as the 3D printer files for printing the hull.