arduino tap midi clock

This sketch implements a MIDI beat clock driver which can be controlled by tapping a button or pedal (such as a digital keyboard sustain pedal) connected to the Arduino. Holding the button/pedal down for 1 second stops the beat messages until a new tempo is tapped in.

The default pinout I used for building a compact unit out of an Arduino Nano is as follows:

• External power supply (5-20V) to pins VIN and GND
• Button or pedal to pins GND and 14 aka A0 (used in INPUT_PULLUP mode)
• MIDI DIN connector pin 2 to Arduino GND
• MIDI DIN connector pin 4 to Arduino pin 5V through a 220 Ohm resistor
• MIDI DIN connector pin 5 to Arduino pin 10 through a 220 Ohm resistor
• Status LED to Arduino pin 6 (through a suitable resistor) and GND

Since the MIDI messages are not sent via the hardware serial interface, it is also possible to run the Arduino off USB power and use the normal Serial monitor for debugging.

Dependencies

This sketch requires two libraries, both available for download from within Arduino:

• ButtonDebounce
• TimerOne