DHT ProShield DHT-22 - (Wemos D1 Mini)

Features:

The temperature and humidity data read from sensor is the result of the last measurement (the sensor will measure after you read).
To get real-time data, you need read twice.
But not recommended to repeatedly reading sensor, reading interval should be more than 2 seconds.

Technical specs:

• Temperature: -40~80°C (±0.5°C)
• Humidity: 0-99.9%RH (±2%RH)

Pin:

Arduino Code:

• Install DHT sensor library
• Find code in Arduino IDE:
  File->Sketchbook->libraries->D1_mini_Examples->04.Shields->DHT_Shield

NodeMCU Code:

• Build firmware from Marcel’s NodeMCU custom build cloud service.
• Flash firmware by esptool-ck
• Example

pin = 4
status, temp, humi, temp_dec, humi_dec = dht.read(pin)
if status == dht.OK then
    -- Integer firmware using this example
    print(string.format("DHT Temperature:%d.%03d;Humidity:%d.%03drn",
          math.floor(temp),
          temp_dec,
          math.floor(humi),
          humi_dec
    ))

    -- 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 timed out." )
end

• Reference