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• This repo is obsolete, I've left it here for reference...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.

Sketches

Software development

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