DHT11 Sensor with NodeMCU ESP8266

In this article we will learn how to implement DHT11 Sensor with NodeMCU ESP8266. If your are new to Internet of Things (IoT), learn about IoT by visiting our Internet of Things tutorial for beginners.

Aim of Experiment

To fetch humidity and temperature using DHT11 sensor

Components Required

• NodeMCU – 1
• DHT11 Sensor – 1
• Breadboard – 1

Connections Diagram (Schematic)

Code (C++/Arduino IDE)

//Include DHT library
#include "DHT.h"
#define DHTTYPE DHT11

const int DHT_pin = D1;
DHT dht(DHT_pin, DHTTYPE);

void setup() {
  // put your setup code here, to run once:
  dht.begin();
  Serial.begin(9600);
  delay(500);
}

void loop() {
  // put your main code here, to run repeatedly:
  //Read the temperature
  float t = dht.readTemperature();
  //Read the humidity
  float h = dht.readHumidity();
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" centi, Humidity ");
  Serial.print(h);
  Serial.println("%");
  delay(1000);
}

Instructions

In case of error while compiling, download the zip file from the following GitHub link:

https://github.com/adafruit/Adafruit_Sensor

Then in Arduino go to Sketch -> Include Library -> Add .Zip Library

Navigate to the downloaded zip file and click OPEN.

Video Explanation

Suryateja Pericherla

Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.

He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.

He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.