Control LED through Blynk V0 and read sensor data from Blynk V1 and V2.

BlynkDHT22.py

from gpiozero import LED
import Adafruit_DHT
import BlynkLib
from time import time

# Initialize Blynk
BLYNK_AUTH = 'YourBlynkAuthToken'
blynk = BlynkLib.Blynk(BLYNK_AUTH)

led8 = LED(19)

sensor_type = Adafruit_DHT.DHT22
sensor_pin = 17

# Register Virtual Pins
@blynk.VIRTUAL_WRITE(0)
def my_write_handler(value):
    v0 = int(format(value[0]))
    print('Current V0 value: {}'.format(v0))
    led8.value = v0

def sendSensorData():
    humidity, temperature = Adafruit_DHT.read_retry(sensor_type, sensor_pin)
    print('Humidity = {:.2f}%\tTemperature = {:.2f}C'.format(humidity, temperature))
    blynk.virtual_write(1, '{:.2f}'.format(temperature))
    blynk.virtual_write(2, '{:.2f}'.format(humidity))

prevTime = 0
interval = 2

try:
    while True:
        blynk.run()
        
        if time() - prevTime > interval:
            sendSensorData()
            prevTime = time()

except KeyboardInterrupt:
    sys.exit(0)