DHT11 with ESP8266 / ESP32

Last Updated on 16. October 2026 by Suffocation●Link status: OK

Controlling a DHT11 sensor via the ESP8266 / ESP32

Foundations

Link to post●Link status: OK

Structure

Programming

Libraries

The integration of the library can be seen in the following post:

Link to post●Link status: OK

Adafruit DHT Library●Link status: OK

Adafruit Unified Sensor Library●Link status: OK

Test programme

Source code DHTTest.ino (GitHub●Link status: OK)

/** DHT Test for ESP8266 and ESP 32
*/

// include adafruit dht lib
#include <DHT.h> // https://github.com/adafruit/DHT-sensor-library
// the unified sensor lib is also needed https://github.com/adafruit/Adafruit_Sensor


// define the pin for the dht sensor
#define DHT_PIN 16
#define DHT_TEMP_CALIBRATION_VALUE -8

// special pin for higrow board
#define POWER_CTRL          4


// define the type of dht sensor
#define DHT_TYPE DHT11
//#define DHT_TYPE DHT21
//#define DHT_TYPE DHT22

// creat a dht object
DHT dhtSensor(DHT_PIN, DHT_TYPE);


void setup() {

  // init serial interface
  Serial.begin(115200);


  //! Sensor power control pin for higrow, use deteced must set high
  //pinMode(POWER_CTRL, OUTPUT);
  //digitalWrite(POWER_CTRL, HIGH);
  //delay(1000);

  // start dht sensor
  dhtSensor.begin();

}


void loop() {
  // get some values
  // read temperture in Celsius
  float temp = dhtSensor.readTemperature() + DHT_TEMP_CALIBRATION_VALUE ;

  // read humidity in %
  float humi = dhtSensor.readHumidity();

  // ouptu the values
  Serial.printf("Temperatur %2.2f °C \t Humidity %3.0f\%\n", temp, humi);

  // wait a while
  delay(2000);
}

Related Posts

 Sources

DHT sensor in general●Link status: OK

Adafruit DHT Library●Link status: OK

Adafruit Unified Sensor Library●Link status: OK