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 pin setting 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)

Dependencies

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

• ButtonDebounce
• TimerOne