Transposer.ino

Transposer

This is an example that demonstrates the use a Transposer to transpose the note events sent out by NoteButtons.

Boards: 🛈

AVR, AVR USB, Nano Every, Due, Nano 33 IoT, Nano 33 BLE, UNO R4, Pi Pico, Teensy 3.x, ESP32, ESP8266

Connections

• 2-9: momentary push buttons (to ground) to use as "piano keys"
• 10: momentary push button (to ground) to transpose one semitone up
• 11: momentary push button (to ground) to transpose one semitone down

The internal pull-up resistor for the buttons will be enabled automatically.

Behavior

• By default, the 8 push buttons on pins 2-9 send MIDI Note events for notes C4 - C5.
• If you press the push button on pin 10, all notes are transposed one semitone up.
• If you press the push button on pin 11, all notes are transposed one semitone down.
• If you press the push buttons on pins 10 and 11 simultaneously, the transposer resets.

Mapping

Route the Arduino MIDI port into a synth to play the notes.

Written by PieterP, 2019-10-26
https://github.com/tttapa/Control-Surface

 
#include <Control_Surface.h> // Include the Control Surface library
 
// Instantiate a MIDI over USB interface.
USBMIDI_Interface midi;
 
// Instantiate a Transposer that can transpose from one octave down to one
// octave up
Transposer<-12, +12> transposer;
 
// Instantiate a Selector to change the transposition
IncrementDecrementSelector<transposer.getNumberOfBanks()> selector {
  transposer,
  {10, 11},
  Wrap::Clamp,
};
 
// Instantiate an array of NoteButton objects
Bankable::NoteButton buttons[] {
  {transposer, 2, MIDI_Notes::C[4]}, {transposer, 3, MIDI_Notes::D[4]},
  {transposer, 4, MIDI_Notes::E[4]}, {transposer, 5, MIDI_Notes::F[4]},
  {transposer, 6, MIDI_Notes::G[4]}, {transposer, 7, MIDI_Notes::A[4]},
  {transposer, 8, MIDI_Notes::B[4]}, {transposer, 9, MIDI_Notes::C[5]},
};
 
void setup() {
  Control_Surface.begin(); // Initialize Control Surface
}
 
void loop() {
  Control_Surface.loop(); // Update the Control Surface
}