NodeMCU DHT22 test

init.lua

pin = 4
status,temp,humi,temp_decimial,humi_decimial = dht.read(pin)
if( status == dht.OK ) then
  -- Integer firmware using this example
  print(     
    string.format(
      "DHT Temperature:%d.%03d;Humidity:%d.%03d\r\n",
      math.floor(temp),
      temp_decimial,
      math.floor(humi),
      humi_decimial
    )
  )
  
  Using the schematic from this page:
  http://www.seeedstudio.com/recipe/232-primary-iot-make-with-nodemcu-gt-esp8266-lt.html
  -- Float firmware using this example
  print("DHT Temperature:"..temp..";".."Humidity:"..humi)
elseif( status == dht.ERROR_CHECKSUM ) then
  print( "DHT Checksum error." );
elseif( status == dht.ERROR_TIMEOUT ) then
  print( "DHT Time out." );
end

-- http://www.seeedstudio.com/recipe/232-primary-iot-make-with-nodemcu-gt-esp8266-lt.html