MIDI note visualiser for Raspberry Pi Pico and TM1638 LED&KEY module by @axwax

PicoTM1638MIDIVisualiser.py

# MIDI note visualiser for Raspberry Pi Pico and  TM1638 LED&KEY module by @AxWax
#
# Demo: https://twitter.com/AxWax/status/1480659594342899713
#
# This is heavily based on and requires
# the SimpleMIDIDecoder library by @diyelectromusic, which can be found at
# https://diyelectromusic.wordpress.com/2021/06/13/raspberry-pi-pico-midi-channel-router/
# as well as the MicroPython TM1638 LED Driver library by mcauser from
# https://github.com/mcauser/micropython-tm1638
# 
# Wiring:
# serial midi input on GP1 (UART0 RX)
# TM1638    Pico
# VCC       3v3
# GND       GND
# STB       GP4
# CLK       GP3
# DIO       GP2

import machine
import time
import ustruct
import SimpleMIDIDecoder

from time import sleep_ms
from machine import Pin
import tm1638

# Initialise the LED & Key
tm = tm1638.TM1638(stb=Pin(4), clk=Pin(3), dio=Pin(2))

# Initialise the serial MIDI handling
uart = machine.UART(0,31250)

# MIDI callback routines
def doMidiNoteOn(ch, cmd, note, vel):
    tm.show("C."+str(ch)+" N."+str(note)+"        ")
    if vel == 0:
        tm.leds(0b00000000)
    elif vel <= 16:
        tm.leds(0b00000001)
    elif vel <= 32:
        tm.leds(0b00000011)
    elif vel <= 48:
        tm.leds(0b00000111)
    elif vel <= 64:
        tm.leds(0b00001111)
    elif vel <= 80:
        tm.leds(0b00011111)
    elif vel <= 96:
        tm.leds(0b00111111)
    elif vel <= 112:
        tm.leds(0b01111111)
    else:
        tm.leds(0b11111111)
    uart.write(ustruct.pack("bbb",cmd+ch-1,note,vel))

def doMidiNoteOff(ch, cmd, note, vel):
    tm.leds(0b00000000)
    tm.show("C."+str(ch)+" N."+str(note)+"        ")
    uart.write(ustruct.pack("bbb",cmd+ch-1,note,vel))

def doMidiThru(ch, cmd, d1, d2):
    if (d2 == -1):
        uart.write(ustruct.pack("bb",cmd+ch,d1))
    else:
        uart.write(ustruct.pack("bbb",cmd+ch,d1,d2))

md = SimpleMIDIDecoder.SimpleMIDIDecoder()
md.cbNoteOn (doMidiNoteOn)
md.cbNoteOff (doMidiNoteOff)
md.cbThru (doMidiThru)

# the loop
while True:
    # Check for MIDI messages
    if (uart.any()):
        md.read(uart.read(1)[0])