AKAI APC Mini with Mido

apc_mini_output_mido.py

# So, you want to turn some buttons on...

import mido
from mido import Message

# We're aiming for some specific values.  The hex for turning a light green
# is pretty simple: 90 <button> <state>.  The '90' is the MIDI command
# for 'note_on'.  The 'note_on' command has two values that come after it:
# the note and it's velocity.  Since this is a controller, it uses the note
# to signify which button to adjust, and it uses velocity to tell it how to
# light up.  Thanks to David Morrill for getting all this information
# together.
#
# The buttons range from 0 to 98.
# The state is a value from 0 to 6 for the main buttons...
#   0: off    1: green    2: green_blink
#             3: red      4: red_blink
#             5: yellow   6: yellow_blink
# ...and 0 through 2 for the circular ones.
#   0: off    1: on       2: blink
# The shift button is very sad as it has no LED.
# Also, the Scene Launch buttons don't light up.

# First, let's open the channel to the APC Mini.
m_out = mido.open_output(u'APC MINI MIDI 1')

# Then, let's turn button 3 green (or fourth button on
# the bottom row).
msg = Message('note_on', note=3, velocity=1)
m_out.send(msg)

# Turn off all of the lights. Also note that I was too
# lazy to type it out into a proper for loop.
[m_out.send(Message('note_on', note=i, velocity=0) for i in xrange(0,99))]