STATUS_OK = 1
STATUS_ERROR_CHECKSUM = 2
STATUS_ERROR_TIMEOUT = 3
time_between_sensor_readings = 60000

function getSensorData()
  dht = require("dht")
  status,temp,humi,temp_decimal,humi_decimal = dht.read(dhtPin)
  if (status == dht.OK) then
    temperature = temp.."."..(math.abs(temp_decimal)/100)
    humidity = humi.."."..(math.abs(humi_decimal)/100)
    if (temp == 0 and temp_decimal < 0) then
      temperature = "-"..temperature
    end
    return STATUS_OK,temperature,humidity
  elseif (status == dht.ERROR_CHECKSUM) then
    print("DHT CHecksum error")
    return STATUS_ERROR_CHECKSUM,0,0
  elseif(status == dht.ERROR_TIMEOUT) then
    return STATUS_ERROR_TIMEOUT,0,0
  end
  dht = nil
  package.loaded["dht"] = nil
end