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Teensy midi looper

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  • This repo is obsolete, I've left it here for reference...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

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:
  • teensyduino
  • due
  • esp8266
read, play, loop SMF from SD in progress

Software development

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