Awesome

Microcontroller-based midi performance sequencer

This repo is obsolete, I've left it here for reference... please have a look at my latest version, newdigate/teensy-eurorack

prototype device, iteration 1

record midi events from a physical midi input port to standard midi files (SMF) on SD-card
play smf files from SD-card to a physical midi output port
display midi input & output activity, indicators (tempo, key, signature, position) on small color TFT display

hardware

Teensy 3.6 dev board
- 32-bit 180 MHz ARM Cortex-M4 micro-controller
- sd-card built-in
1x Rotary encoder with built-in switch
ST7735 128x128 pixel 16bit color TFT LCD display
De-coupling midi break-out board
- hobbytronics midi-breakout
- also works with BlackAddr Teensy Guitar Audio shield http://blackaddr.com/products/

Teensy 3.6 microcontroller board by pjrc.com

connections

// TFT
#define sclk 14  // SCLK can also use pin 13 (14 is compatibile with audio shield and teensy guitar audio shield
#define mosi 11  // MOSI can also use pin 7
#define cs   10  // CS & DC can use pins 2, 6, 9, 10, 15, 20, 21, 22, 23
#define dc   9   //  but certain pairs must NOT be used: 2+10, 6+9, 20+23, 21+22
#define rst  8   // RST can use any pin

// midi in/out (rx/tx)
#define midi_in_pin 1  // rx  
#define midi_out_pin 2 // tx

// rotary encoder
#define rotary_enc1   3   
#define rotary_enc2   4   
#define rotary_switch 5

Status

The project is a work-in-progress in a very early stage of development; I have working prototype using breadboard, as diagram above, records successfully to smf midi file on sd card which can be read from midi players and daws.

Feature	status	notes
Breadboard view	`in progress`	Using fritzing
PCB	`not started`
Enclosure	`not started`	decide form factor

Sketches


record midi to SMF on SD	`works (needs attention)`	compiles on:<ul><li>teensyduino</li><li>due</li><li>esp8266</li></ul>
read, play, loop SMF from SD	`in progress`

Software development

requirements
- Arduino
- Teensyduino
information about compiling and debugging software here: software