#!/usr/bin/python
import time
import Adafruit_DHT

while True:
    sensor = Adafruit_DHT.DHT22
    pin = 4
    humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
    if humidity is not None and temperature is not None:
        data = [str(int(round(time.time() * 1000))), str(humidity), str(temperature)]
        with open('/var/www/data.csv', 'a') as f:
            f.write(','.join(data) + '\r\n')