The MIDI Theremin – Where Electronics Meet Expression
Looking for a fun and creative way to learn electronics? Our DIY MIDI Theremin brings music and making together in one unique, hands-on experience.
Designed to be both affordable and accessible, this kit lets you explore the world of electronic music while learning how real components work. Using infrared (IR) sensors, the theremin detects your hand movements and translates them into MIDI signals, which you can send to any DAW (Digital Audio Workstation)* to play virtual instruments, create melodies, and experiment with sound.
But it’s not just about making noise. With features like key and scale selection, shown clearly on a built-in OLED display, you’ll be able to control and shape your music with ease.
And because learning is at the heart of our design, the theremin’s body opens like a treasure chest, giving you a clear view of all internal components—perfect for curious minds who want to understand how everything works.
Ideal for classrooms, STEM programs, and hobbyists, this theremin can also be used as part of an educational challenge. Starting from basic components, students can build up their knowledge and skills, culminating in the rewarding experience of assembling a fully functional electronic instrument.
Whether you’re just getting into music, love building things, or a teacher looking to inspire, the DIY MIDI Theremin is your gateway to creative learning.
*DAW software not included.
“With our Theremin and a wave of your hand, you too can become a one-man band.“
Here we can see some basic tests done with the components received.
First the infrared sensor is tested in its distance measurement, and at the same time we test interrupting that process with buttons.
Afterwards we test the communication between the microcontroller and the DAW software through MIDI messages. This is made by sending two alternating notes and checking if their sound is reproduced in the laptop.
This video shows some of the prototypes created through the development process in order to exhibit their evolution.
We start with a version that only incorporates 1 infrared sensor that controls the pitch, but the transition between notes is still rough.
Afterwards, with software changes we can see a smoother transition between the notes.
Skipping ahead, the display has been implemented, showing the scale, note and volume being played. There’s also a second infrared sensor now to control the volume and lowpass filters at the sensors’ outputs.
Iterating on the previous version, it is now possible, using buttons, to change between 4 different scales (Chromatic, Major, Minor and Pentatonic) as well as change the key in which the instrument is playing