Examples

Table of Contents

• Getting started
• MIDI interfaces
  • Interfaces, transports and routing
  • Sending and receiving MIDI messages
• MIDI output elements
  • Potentiometers & Faders
  • Buttons & Switches
  • Rotary Encoders
  • Program Changers
  • Other
• MIDI input elements
  • LEDs
  • Other
• Banks & Selectors
• Hardware and Extended Input/Output
• Displays
• Board-specific examples
  • Teensy
  • ESP32
• Extending the library
• Other examples

Getting started

• 1.First-Output.ino (Multiplexed potentiometers that send MIDI Control Change messages)
• 2.First-Input.ino (LEDs driven by a shift register that turn on/off when a MIDI Note On/Off message is received)

MIDI interfaces

Interfaces, transports and routing

• MIDI_Pipes-Routing.ino (Setting up automatic routes for MIDI messages between multiple MIDI interfaces, using MIDI_Pipes)
• MIDI_Pipes-Filter.ino (More complicated MIDI routing rules that also filter and modify MIDI messages that travel through a MIDI_Pipe)
• Serial-Interface.ino (Sending and receiving MIDI messages over a serial port (e.g. for 5-pin DIN MIDI))
• BLEMIDI-Adapter.ino (Sending and receiving MIDI messages over Bluetooth Low Energy (LE), and relaying them over Serial)
• USBMIDI-Adapter.ino (Sending and receiving MIDI messages over USB, and relaying them over Serial)
• USBHostMIDI_Interface-Passthrough.ino (Sending and receiving MIDI messages to and from USB MIDI devices connected to a Teensy's USB Host port, and relaying them over the USB Device port)
• AppleMIDI.ino (Sending and receiving MIDI messages over the network (WiFi/Ethernet) using RTP-MIDI)
• Debug-MIDI-Interface.ino (Printing and reading MIDI messages to/from the Serial monitor for debugging purposes)
• MIDI-Monitor.ino (Turns the Arduino into a MIDI monitor by printing all messages it receives to the Serial monitor, and sending messages typed into the Serial monitor over MIDI)
• MIDI-Monitor-OLED.ino (Prints all messages that are sent and received to a small OLED display)
• Dual-MIDI-Interface.ino (Using multiple MIDI interfaces at the same time)

Sending and receiving MIDI messages

• MIDI-Input.ino (Handling incoming MIDI messages using the MIDI_Callbacks class)
• MIDI-Input-Fine-Grained.ino (Handling incoming MIDI messages using the FineGrainedMIDI_Callbacks class)
• MIDI-Input-Fine-Grained-All-Callbacks.ino (Same as the previous, handles all possible message types)
• MIDI-Output.ino (Sends MIDI Note On/Off message every second)
• Send-MIDI-Notes.ino (Sends MIDI Note On/Off messages when a push button is pressed/released)
• Send-All-MIDI-Messages.ino (Demonstrates how to send all possible MIDI message types)
• SysEx-Send-Receive.ino (Sends and receives MIDI System Exclusive messages)

MIDI output elements

Potentiometers & Faders

• Control-Change-Potentiometer.ino (A single analog input from a potentiometer that sends MIDI Control Change messages)
• Multiple-Control-Change-Potentiometers.ino (Multiple analog inputs)
• CCPotentiometer-Map.ino (Applying a mapping function to the analog input to account for nonlinearities or calibrate the minimum and maximum values)
• Pitch-Bend-Potentiometer.ino (A single analog input from a potentiometer that sends MIDI Pitch Bend messages (higher resolution than Control Change))

Buttons & Switches

• NoteButton.ino (A single digital input from a momentary push button that sends MIDI Note On/Off messages)
• CCButton.ino (A single digital input from a momentary push button that sends MIDI Control Change messages)
• NoteButtonMatrix.ino (A scanning keyboard matrix for a grid of momentary push buttons that send MIDI Note On/Off messages)
• CCIncrementDecrementButtons.ino (Two momentary push buttons that increment/decrement a value by sending relative MIDI Control Change messages)

Rotary Encoders

• RotaryEncoder.ino (A quadrature encoder that sends position changes using relative MIDI Control Change messages)
• AbsoluteRotaryEncoder.ino (A quadrature encoder that sends its absolute position using MIDI Control Change messages)
• MCP23017-RotaryEncoder-No-Interrupts.ino (Multiple quadrature encoders connected through a MCP23017 port expander that send position changes using relative MIDI Control Change messages)
• MCP23017-RotaryEncoder-Interrupts.ino (Same as previous, but interrupt-driven (Teensy only))

Program Changers

• PCButton.ino (A single digital input from a momentary push button that sends a MIDI Program Change message when pressed)
• Program-Changer.ino (Multiple momentary push buttons (or any other selector) that sends MIDI Program Change messages)
• ManyAddressesPCButton.ino (Multiple buttons that send MIDI Program Change messages, and the programs they send are arranged in multiple banks, allowing you to select many programs using a limited number of buttons)

Other

• MIDI-Controller-Finished-Example.ino (An example MIDI Controller that combines switches, potentiometers, rotary encoders and banks)

MIDI input elements

LEDs

• 1.Note-LED.ino (An LED that turns on when a MIDI Note On message for a specific note is received, and off when a Note Off message is received)
• 2.Note-Range-LEDs.ino (Similar to the previous, but for multiple LEDs and a range of consecutive notes)
• 3.NoteLEDBar.ino (An LED bar graph that displays the value of received MIDI Control Change messages)
• 4.VULEDs.ino (An LED bar graph that displays a level meter based on Mackie Control Universal MIDI messages sent by a DAW)
• 5.Note-LED-PWM.ino (An LED that changes brightness depending on the MIDI velocity value received)
• 6.MAX7219-NoteLED.ino (Similar to 1.Note-LED.ino, but using a MAX7219 8×8 LED driver)
• 9.Note-FastLED.ino (Similar to 1.Note-LED.ino, but for addressable LEDs using the FastLED library)
• 10.Note-FastLED-ColorMapper.ino (Similar to previous, but customizing the colors and intensity based on the note number and the velocity)

Other

• Pitch-Bend-Value.ino (Keeps track of the value of incoming MIDI Pitch Bend messages)

Banks & Selectors

• Bank.ino (Using banks to control the volume of 8 tracks using only 2 physical potentiometers)
• Transposer.ino (Using a transposer to change the pitch of some NoteButtons using two push buttons)
• Custom-Selector-Callback.ino (Changing the color of an RGB LED depending on the currently selected bank)
• Bankable-Smart-Control-Change-Potentiometer.ino (Using potentiometers in banks can be tricky because they might send messages while cycling between banks, this issue is addressed by the CCSmartPotentiometer)

Hardware and Extended Input/Output

• 1.FilteredAnalog.ino (Filtering an analog input using a digital low-pass filter and hysteresis)
• 1.FilteredAnalog-Advanced.ino (Similar to previous, with more advanced features and options)
• 2.Button.ino (Debounce a switch or push button)
• 3.MultiPurposeButton.ino (Detect long presses and double presses of a push button)
• 1.AnalogReadSerial.ino (Printing the values of all channels of a multiplexer to the serial monitor)
• 2.DigitalReadSerial.ino (Similar to previous, but for digital inputs)
• 3.FilteredAnalogReadSerial.ino (Similar to 1.AnalogReadSerial.ino, but filters the analog inputs)
• 1.SPI-Blink.ino (Blink an LED that's driven by a shift register connected using SPI)
• 2.BitBang-Blink.ino (Similar to previous, but using ordinary GPIO pins instead of SPI)
• 2.RGB-LED-Chaser.ino (Display some fancy patterns using a handful of RGB LEDs driven by shift registers)
• 1.MAX7219-Blink.ino (Blink an LED that's driven by a MAX7219 8×8 LED driver)
• MCP23017.ino (Read input from a push button and turn on/off an LED using a MCP23017 I²C port expander)
• Toggle-LEDs.ino (Read digital inputs from 8 push buttons connected through a multiplexer, and use them to toggle 8 LEDs on/off, using a shift register to drive them)
• MCP23017-Encoders-No-Interrupts.ino (Read multiple quadrature encoders using a MCP23017 port expander)
• MCP23017-Encoders-Interrupts.ino (Same as previous, but interrupt-driven (Teensy only))
• Pin-Change-Interrupt-Encoders.ino (Read multiple quadrature encoders using pin change interrupts instead of polling (AVR only))
• Timer-Interrupt-Encoders.ino (Use a timer interrupt to poll multiple quadrature encoders at a consistent rate (AVR only))

Displays

• MCU-OLED-SSD1306.ino (Demonstrates the use of DisplayElements to display information from the DAW on a small OLED display)
• MCU-OLED-SSD1306-x2.ino (Similar to previous, with two OLED displays instead of one)

Board-specific examples

Teensy

• 1.Volume-Controlled-USB-DAC.ino (USB audio interface with a potentiometer to control the volume)
• 2.VU-Meter-OLED-USB-DAC.ino (USB audio interface with a VU meter displayed on a small OLED display)

ESP32

• VU-Meter-Bridge.ino (Mackie Control Universal control surface with an OLED display for real-time level meters and a MIDI over BLE interface)

Extending the library

• Custom-USB-MIDI-Backend.ino (Adding support for alternative MIDI over USB libraries (host and device))
• Custom-MIDI-Sender.ino (Customize the type of messages sent by the provided MIDI output elements)
• Custom-MIDI-Output-Element.ino (Adding your own MIDI output elements, recreating and then customizing the NoteButton class)
• Custom-MIDI-Output-Element-Bankable.ino (Same as previous, but for the NoteButton class)
• Custom-MIDI-Input-Element.ino (Adding your own customizable MIDI input elements, recreating the NoteLED class)
• Custom-Note-LED-Input-Element-Callback.ino (Similar to previous, but with PWM output)
• Custom-Note-LED-Input-Element-Callback-FastLED.ino (Similar to previous, but with support for FastLED addressable LED strips)

Other examples

• Debug.ino (How use the debug macros for printing different kinds of debugging information)
• BlinkWithoutDelay-Timer.ino (Non-blocking delay using the Timer class)
• Mackie-Control-Universal-Reverse-Engineering.ino (Translates incoming MIDI messages to the corresponding Mackie Control Universal names and prints them to the Serial monitor)
• MIDI-Input-Callback.ino (Uses the MIDI input callbacks of the Control_Surface_ class to intercept MIDI input)
• Keyboard-Matrix-BCD.ino
• Bank-Button-Matrix.ino
• Encoder-Selector-Bank.ino
• Note-ManyAddresses-Transposer.ino
• One-Pot-Both-PB-and-CC.ino
• MIDI_controller-97.ino
• Transpose-Octave-NC-Button.ino
• FilteredAnalog.ino
• NoteChordButton.ino
• Enable-disable.ino
• Quaternion.ino
• Blink-Frequency-Buttons.ino
• Numeric.ino
• CountPressedButtons.ino
• ArraySort.ino
• Complex.ino
• VU-Bridge.ino
• VU-Bridge-Dual-Display.ino