In my project I'm trying to implement a Cortex-M0-like UART auto baud rate detection feature on a Cortex-M3, which unfortunately does not have this handy feature on-board. The idea is that the ma. Nov 25, 2017 Hey, I'm thinking about building a theremin based on a STM32 microcontroller. It should be a simple theremin with excellent sound quality. It must be cheap and easy to build. I have an Open Theremin V3 and for me there is too much digital noise in the audio signal. It sounds like you can hear the frequency where the the volume and pitch values are sampled. The idea is to use a STM32F407G.
A very cheap and easy to build Theremin for only 50$
The STM32F407G-DISC1 evaluation board can be used.So you need only 2 additional oscillators and some potentiometers and switches.
![]() Schematic
(Values of pitch oscillator)
Layout
The oscillators can be built up on a breadboard:
Bill of material
Suppliers:m: www.mouser.comf: www.farnell.com / www.newark.comd: www.digikey.com
L1 should be an air-coil with 1mH. Eg. 200 windings of 0.15mm wire on a core with 40mm diameter.
Use http://hamwaves.com/antennas/inductance.html for other diameters.
Pin maps
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Connect an extra 100nF capacitor under each potentiometer from the potentiometer output to GND.
Auto-tune
The blue button on the STM32 discovery board starts the Auto-Tune procedure.
You can also use an additional button and connect it to:
Pitch LED display
Optional display to show the current played note one a piano like display.
Connect 3mm LEDs with a series resistor of 100R to these PINs and connect allcathodes of to GND:
Power supplyArduino Stm32 Board
The STM32 discovery board must be supplied by 5V (100mA). It is importand that the GND is connected to earth (PE). If a normal wall adapter is used, there must be an extra connection to earth (PE).
The best power supply would be a linear one like this: https://github.com/gerdb/tinnitus32/wiki/Power-supply
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Antares Auto-tuneUSB-stick with sound file
It's possible to store a *.WAV or a *.C file on an USB-stick and use it as sound source for the theremin.
WAV fileAutotune Download
The file name must be WAV1.WAV and it must contain 1 periode of a sound sample. File format must be WAV (Microsoft) and the data format signed 16 bit PCM with only one mono track. Use Audacity to export it. https://www.audacityteam.org/
C file
The file name must be WAV1.C and it must contain 1 periode of a sound sample. File format must be the same as the Audio Wavetables from the Open.Theremin V3 project. http://www.gaudi.ch/OpenTheremin/index.php/download/audio-wavetables
![]() Stm32 Dev BoardProgramming software for STM32
You find the binary file in the 'Binary' folder. Download the tinnitus project as ZIP
Program the STM32 board with the STM32CUBEPROG tool.
Stm32 EvalCase and front panel
As case a wooden wine box could be used.
The cheapest way for a professional looking front panel would be to use the service of a sign manufacturer. For example:https://www.digitaldruck-fabrik.de/werbeschilder/hart-pvc-polystyrolplatte.aspx
Autotune Free Download
Price of a 380x110mm front panel is about 4€ or 5$
Voice Changer
Little snitch discount 2016 calendars. You can use the template under hardware/Frontpanel, but you have to adapt the size of the front panel file to your wine box. Use eg. https://inkscape.org
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