from machine import Pin, Timer
import dht

dht22 = dht.DHT22(Pin(4))

def take_measurement_isr(event):
    dht22.measure()
    print("Temp: ", dht22.temperature(), "ºC, Humidity: ", dht22.humidity(), "%", end = " \r")

dht_timer = Timer(1)
dht_timer.init(period=1000, mode=Timer.PERIODIC, callback=take_measurement_isr)