Displaying text on MAX7219 dot matrix from Blynk app.

BlynkMAX7219DotMatrix.py

from gpiozero import LED, Button, Buzzer
import BlynkLib
from time import time, sleep, strftime
from datetime import datetime
import sys

from luma.core.interface.serial import spi, noop
from luma.core.render import canvas
from luma.core.virtual import viewport
from luma.led_matrix.device import max7219
from luma.core.legacy import text, show_message
from luma.core.legacy.font import proportional, CP437_FONT, LCD_FONT

led1 = LED(17)
led2 = LED(18)
led3 = LED(27)
led4 = LED(22)
led5 = LED(25)
led6 = LED(12)
led7 = LED(13)
led8 = LED(19)
sw1 = Button(21)
buzzer = Buzzer(26)

BLYNK_AUTH = 'YourAuthToken'

# Initialize Blynk
blynk = BlynkLib.Blynk(BLYNK_AUTH)

# Register Virtual Pins
@blynk.VIRTUAL_WRITE(0)
def my_write_handler(value):
    global counter
    global BlynkText
    buzzer.beep(0.1, 0.1, 1)
    BlynkText = format(value[0])
    print('Blynk Text: {}'.format(BlynkText))
    counter = 1

serial = spi(port=0, device=0, gpio=noop())
device = max7219(serial, width=32, height=8, block_orientation=-90)
device.contrast(5)
virtual = viewport(device, width=32, height=8)

def millis():
    return time() * 1000

def my_user_task():
    global counter
    global BlynkText
    print('Counter = {}'.format(counter))
    if counter == 0:
        buzzer.beep(0.1, 0.1, 2)
        show_message(device, 'Blynk Ready', fill="white", font=proportional(LCD_FONT), scroll_delay=0.05)
        counter = 3
    elif counter < 4:
        if len(BlynkText) > 0:
            show_message(device, BlynkText, fill="white", font=proportional(LCD_FONT), scroll_delay=0.08)
        else:
            counter = 3
    else:
        if counter == 10:
            counter = 0
        with canvas(virtual) as draw:
            text(draw, (0, 1), datetime.now().strftime('%I:%M'), fill="white", font=proportional(CP437_FONT))
    counter = counter + 1

counter = 0
BlynkText = ''
currentMillis = 0
previousMillis = 0
interval = 5000

try:
    while True:
        blynk.run()
        
        currentMillis = millis()
        if currentMillis - previousMillis > interval:
            my_user_task()
            previousMillis = currentMillis

except KeyboardInterrupt:
    sys.exit(0)