TuneShroom

An artistic capacitive MIDI USB controller

Download Gerbers

Order PCBs:

Compare PCB Prices:

Adjust quantity:

11/11 lines (17 parts)

References	Qty	Description	Manufacturer	MPN	Manufacturer	MPN	Manufacturer	MPN	Digikey	Mouser	RS	Farnell
C1, C2	2	C 22pF 0805	KEMET	C0805C220J5GACTU	AVX	08051A220J4T2A			399-1113-1-ND	80C0805C220J5G	2644258P	1625484
C3, C5	2	C 0.1uF 0805	Yageo	CC0805KRX7R9BB104	Murata	GRM21BR71H104KA01L			311-1140-6-ND	603CC805KRX7R9BB104	6698842	3019949
C4	1	C 1uF 0805	TDK	C2012X7S2A105K125AB	Yageo	CC0805KKX7R8BB105			311-1456-6-ND	603CC805KKX7R8BB105	7883054P	1458903
D1, D2	2	LED 0805 red	Broadcom	HSMS-C170	VCC	7012X1			516-1429-6-ND	630HSMSC170	1371306	5790839
J23	1	USB B Micro Type connector Micro-B Molex 47346-0001	Molex	47346-0001		47346-0001			WM17141CT-ND	538473460001	7025475	1568026
R1, R5	2	R 10K 0805	Vishay	CRCW080510K0FKEA	Panasonic	ERJ-6ENF1002V	Yageo	RC0805FR-0710KL	311-10.0KCRDKR-ND	603RC0805FR0710KL	6790816	2148862
R2, R3	2	R 22 0805	Panasonic	ERJ-6GEYJ220V	Yageo	RC0805JR-0722RL			311-22ARCT-ND	603RC0805JR0722RL	7326602	1799493

... 4 more lines

View All

🎵🍄 TuneShroom

An artistic capacitive MIDI USB controller - Just a small project to practice artistic PCB design and embedded programming. Find out more on my website

Hardware

The PCB was designed in KiCAD using the wonderful svg2shenzhen plugin for Inkscape. The circuit is essentially a Sparkfun Pro Micro, thanks Sparkfun for sharing the schematic! It uses an Atmega32u4 with native USB. Each of the IO pins is hooked directly to one of the touch pads on the front and acts as MIDI key.

Firmware

I started out using Arduino but to access more pins and have more control I decided to go the bare metal approach. The current firmware is a patched version of LUFA which does all the USB stuff for me.

Programming

To compile the firmware go into the project folder and make all.

To Flash it onto the board you need an AVR programmer of some kind and to build a little ISP programmer with some pogo pins.

Some fuses have to be changed from their default using:

avrdude -c usbasp -p ATmega32u4 -U hfuse:w:0xD8:m -U lfuse:w:0xFF:m -U efuse:w:0xCB:

Then it's just a case of programming it with:

avrdude -c usbasp -p ATmega32u4 -U flash:w:TuneShroom.hex

Inspect Gerbers

Assembly Guide