View source for WeMOS: D1 R1 mini DHT11 read

 // Example testing sketch for various DHT humidity/temperature sensors
 // Written by ladyada, public domain
 
 // REQUIRES the following Arduino libraries:
 // - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
 // - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
 
 #include "DHT.h"
 
 #define DHTPIN D2     // Digital pin connected to the DHT sensor
 // Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
 // Pin 15 can work but DHT must be disconnected during program upload.
 
 // Uncomment whatever type you're using!
 #define DHTTYPE DHT11   // DHT 11
 //#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
 //#define DHTTYPE DHT21   // DHT 21 (AM2301)
 
 // Connect pin 1 (on the left) of the sensor to +5V
 // NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
 // to 3.3V instead of 5V!
 // Connect pin 2 of the sensor to whatever your DHTPIN is
 // Connect pin 3 (on the right) of the sensor to GROUND (if your sensor has 3 pins)
 // Connect pin 4 (on the right) of the sensor to GROUND and leave the pin 3 EMPTY (if your sensor has 4 pins)
 // Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
 // Initialize DHT sensor.
 // Note that older versions of this library took an optional third parameter to
 // tweak the timings for faster processors.  This parameter is no longer needed
 // as the current DHT reading algorithm adjusts itself to work on faster procs.
 DHT dht(DHTPIN, DHTTYPE); 
 
 void setup() {
   Serial.begin(9600);
   Serial.println(F("DHTxx test!"));
 
   dht.begin();
 }
 
 void loop() {
   // Wait a few seconds between measurements.
   delay(2000);

   // Reading temperature or humidity takes about 250 milliseconds!
   // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
   float h = dht.readHumidity();
   // Read temperature as Celsius (the default)
   float t = dht.readTemperature();
   // Read temperature as Fahrenheit (isFahrenheit = true)
   float f = dht.readTemperature(true);
 
   // Check if any reads failed and exit early (to try again).
   if (isnan(h) || isnan(t) || isnan(f)) {
     Serial.println(F("Failed to read from DHT sensor!"));
     return;
   }
   // Compute heat index in Fahrenheit (the default)
   float hif = dht.computeHeatIndex(f, h);
   // Compute heat index in Celsius (isFahreheit = false)
   float hic = dht.computeHeatIndex(t, h, false);
 
   Serial.print(F("Humidity: "));
   Serial.print(h);
   Serial.print(F("%  Temperature: "));
   Serial.print(t);
   Serial.print(F("°C "));
   Serial.print(f);
   Serial.print(F("°F  Heat index: "));
   Serial.print(hic);
   Serial.print(F("°C "));
   Serial.print(hif);
   Serial.println(F("°F"));
 }