import time | |
import board | |
import busio | |
import usb_midi | |
import adafruit_midi | |
from adafruit_midi.note_off import NoteOff | |
from adafruit_midi.note_on import NoteOn | |
from adafruit_bus_device.i2c_device import I2CDevice | |
import adafruit_dotstar | |
from digitalio import DigitalInOut, Direction, Pull | |
# RGB MIDI controller example for Pimoroni RGB Keypad for Raspberry Pi Pico | |
# Prerequisites | |
# | |
# Requires Adafruit CircuitPython: https://learn.adafruit.com/getting-started-with-raspberry-pi-pico-circuitpython | |
# | |
# Also requires the following CircuitPython libs: adafruit_midi, adafruit_bus_device, adafruit_dotstar | |
# (drop them into the lib folder) | |
# | |
# Save this code in code.py on your Raspberry Pi Pico CIRCUITPY drive | |
# Pull CS pin low to enable level shifter | |
cs = DigitalInOut(board.GP17) | |
cs.direction = Direction.OUTPUT | |
cs.value = 0 | |
# Set up APA102 pixels | |
num_pixels = 16 | |
pixels = adafruit_dotstar.DotStar(board.GP18, board.GP19, num_pixels, brightness=0.1, auto_write=True) | |
# Set up I2C for IO expander (addr: 0x20) | |
i2c = busio.I2C(board.GP5, board.GP4) | |
device = I2CDevice(i2c, 0x20) | |
# Set USB MIDI up on channel 0 | |
midi = adafruit_midi.MIDI(midi_out=usb_midi.ports[1], out_channel=0) | |
# Function to map 0-255 to position on colour wheel | |
def colourwheel(pos): | |
if pos < 0 or pos > 255: | |
return (0, 0, 0) | |
if pos < 85: | |
return (255 - pos * 3, pos * 3, 0) | |
if pos < 170: | |
pos -= 85 | |
return (0, 255 - pos * 3, pos * 3) | |
pos -= 170 | |
return (pos * 3, 0, 255 - pos * 3) | |
# List to store the button states | |
held = [0] * 16 | |
# Keep reading button states, setting pixels, sending notes | |
while True: | |
with device: | |
# Read from IO expander, 2 bytes (8 bits) correspond to the 16 buttons | |
device.write(bytes([0x0])) | |
result = bytearray(2) | |
device.readinto(result) | |
b = result[0] | result[1] << 8 | |
# Loop through the buttons | |
for i in range(16): | |
if not (1 << i) & b: # Pressed state | |
pixels[i] = colourwheel(i * 16) # Map pixel index to 0-255 range | |
if not held[i]: | |
midi.send(NoteOn(36 + i, 100)) # If not already held, then send note | |
held[i] = 1 | |
else: # Released state | |
pixels[i] = (0, 0, 0) # Turn pixel off | |
midi.send(NoteOff(32 + i, 0)) # If not held, send note off | |
held[i] = 0 # Set held state to off |
@joeynuggetz You’re quite correct about the note numbers, I think, although I don’t have mine to hand right now to test it out.
As to why it’s sending notes constantly, could one of the buttons be pushed down, and hence stuck on, by the retaining plate? Can you remove that plate (if it’s fitted) and try again?
I dont believe its an issue with stuck keys. I've gotten the code to work correctly and midi appears to be functioning ok except that the midi indicator stays lit. If I press and release each key, samples/notes play and then release/sustain properly so not sure what's going on.
Hey @joeynuggetz! Finally had a chance to plug my keypad in and try this out. I've realised what's causing this. It's because if the keys aren't pressed then logic dictates that they are released, so the else clause sends out the note off messages, and this will happen continuously. It's not really a problem, I think, as the MIDI bus should be capable of handling it.
Hi @sandyjmacdonald
I have tested your code with the modifications of @kenimaister and it does work fine with Ableton Live 11 lite. So I would like to thank you for your good work!
After reading your last post I deleted the NoteOff command in Line 76 and the program is still working fine with Ableton.
I also tested it with two other DAWs without any problems.
Hi @kenimaister thank you for your comment, it fixed my problem of the mirrored (inverted?) keys! Now I can enjoy using the keypad with Ableton without having to do some additional mental gymnastics! And also thank you again to @sandyjmacdonald for the code! It has gotten me into playing around with making some fun tracks and I have also gotten addtional MIDI equipment to do more fun stuff! You're all wonderful!
@joeynuggetz You’re quite correct about the note numbers, I think, although I don’t have mine to hand right now to test it out.
As to why it’s sending notes constantly, could one of the buttons be pushed down, and hence stuck on, by the retaining plate? Can you remove that plate (if it’s fitted) and try again?