Published November 2, 2026 © GPL3+

ESP8266 IoT Temperature & Humidity Monitoring

An IoT-based system that monitors real-time temperature and humidity using ESP8266, DHT11, and KiwisIoT Dashboard.

BeginnerFull instructions provided1 hour34

ESP8266 IoT Temperature & Humidity Monitoring

Things used in this project

Hardware components

Adafruit Feather HUZZAH with ESP8266 WiFi

Solderless Breadboard Half Size

USB-A to Mini-USB Cable

DHT11 Temperature & Humidity Sensor (4 pins)

Male/Female Jumper Wires

Software apps and online services

Kiwistron KiwisIoT

Arduino IDE

Story

ESP8266 IoT Temperature & Humidity Monitoring

Introduction

Temperature and humidity monitoring is important in homes, classrooms, offices, laboratories, and other environments.

In this project, I developed an IoT-based temperature and humidity monitoring system using an ESP8266 NodeMCU and a DHT11 sensor.

The DHT11 sensor collects temperature and humidity readings. The ESP8266 connects to Wi-Fi and sends the collected data to the KiwisIoT Dashboard, where users can monitor the readings remotely.

Project Overview

This project uses an ESP8266 NodeMCU to collect environmental data from a DHT11 sensor and transmit it to the KiwisIoT platform.

The dashboard displays two separate readings:

Temperature in degrees Celsius (°C).
Humidity in percentage (%).

The readings are updated approximately every 2 seconds.

Components Required

ESP8266 NodeMCU – 1

DHT11 Temperature and Humidity Sensor – 1
Jumper Wires – As required
USB Cable – 1
Computer – 1

Software and Tools Required

ESP8266 Board Package
KiwisIoT Arduino Library
DHT Sensor Library

Adafruit Unified Sensor Library

KiwisIoT Account

Wi-Fi Connection

Circuit Connections

The DHT11 sensor is connected to the ESP8266 NodeMCU using jumper wires.

DHT11 Sensor

ESP8266 NodeMCU

VCC 3.3V

DATA D5

GND GND

The sensor module is connected directly to the ESP8266.

Working Principle

The DHT11 sensor measures the surrounding temperature and humidity.

The ESP8266 NodeMCU reads the sensor values and connects to the internet through Wi-Fi. It then sends the collected readings to the KiwisIoT platform.

The KiwisIoT Dashboard receives the data and displays it using separate temperature and humidity widgets.

System Data Flow

DHT11 Sensor → ESP8266 NodeMCU → Wi-Fi → KiwisIoT Platform → Dashboard

KiwisIoT Dashboard Configuration

The KiwisIoT Dashboard is used to monitor the temperature and humidity readings remotely.

The dashboard is configured with two channels:

Channel

Sensor Data

Unit Channel 0 Temperature°C

Channel 1 Humidity%

Two dashboard widgets are created:

Temperature Widget: Displays the temperature reading from Channel 0.
Humidity Widget: Displays the humidity reading from Channel 1.

After configuring the dashboard and connecting the ESP8266, the sensor readings are sent to the corresponding channels.

Dashboard Monitoring

The KiwisIoT Dashboard displays the sensor readings in a simple and understandable format.

The dashboard demonstration shows:

Temperature: 28.5 °C

Humidity: 72.3

These values are example readings displayed in the dashboard demonstration. Actual readings may vary depending on the surrounding environment.

Testing and Results

After connecting the DHT11 sensor to the ESP8266 NodeMCU, the system is powered through a USB cable.

The ESP8266 reads the temperature and humidity values from the sensor and sends them to the KiwisIoT platform through Wi-Fi.

The received readings are displayed on the KiwisIoT Dashboard using the configured widgets.

The system is designed to update the readings approximately every 2 seconds, allowing users to monitor environmental conditions remotely.

Applications

Home temperature and humidity monitoring.
Classroom environment monitoring.
Office environment monitoring.
Laboratory monitoring.
Greenhouse monitoring.
Smart building applications.

Future Improvements

Add notifications when temperature or humidity exceeds a selected limit.
Store historical sensor readings.
Monitor multiple locations using additional sensors.
Add more environmental sensors.
Improve the dashboard with additional monitoring features.

Conclusion

This project demonstrates a simple IoT-based temperature and humidity monitoring system using ESP8266 NodeMCU and a DHT11 sensor.

By integrating the ESP8266 with the KiwisIoT platform, temperature and humidity readings can be monitored remotely through an online dashboard.

This project provides practical experience in sensor interfacing, Wi-Fi communication, and IoT-based monitoring.

Technologies Used

ESP8266 NodeMCU

DHT11 Temperature and Humidity Sensor

Arduino IDE

Wi-Fi Communication

KiwisIoT Dashboard

IoT Technology

Code

# ESP8266 IoT Temperature & Humidity Monitoring

/*
 * Project: DHT11 Temperature and Humidity Monitoring with ESP8266 and KiwisIoT
 * Project ID: KIWISIOT-004
 * Board: ESP8266 NodeMCU
 * Sensor: DHT11
 */

#include <ESP8266WiFi.h>
#include <KiwisIoT.h>
#include <DHT.h>

const char* ssid = "YOUR_WIFI_NAME";
const char* pass = "YOUR_WIFI_PASSWORD";

const char* topic = "YOUR_DASHBOARD_TOPIC_ID";

#define DHT_PIN D5
#define DHT_TYPE DHT11

DHT dht(DHT_PIN, DHT_TYPE);

KiwisIoT kiwisiot(ssid, pass, topic);

void sendDHTData() {

  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {

    Serial.println();
    Serial.println("Failed to read DHT11!");

    return;
  }

  Serial.println();
  Serial.println("---------- DHT11 MONITORING ----------");

  Serial.print("Temperature: ");
  Serial.print(temperature, 1);
  Serial.println(" °C");

  Serial.print("Humidity: ");
  Serial.print(humidity, 1);
  Serial.println(" %");

  String temperatureData = String(temperature, 1);

  kiwisiot.send("0", temperatureData);

  Serial.print("Sent to KiwisIoT Channel 0: ");
  Serial.println(temperatureData);

  String humidityData = String(humidity, 1);

  kiwisiot.send("1", humidityData);

  Serial.print("Sent to KiwisIoT Channel 1: ");
  Serial.println(humidityData);
}

void setup() {

  Serial.begin(115200);

  Serial.println("     DHT11 MONITORING     ");

  dht.begin();

  Serial.println("DHT11 initialized");

  Serial.println("Connecting to KiwisIoT...");

  kiwisiot.begin();

  Serial.println("KiwisIoT initialized");
  Serial.println("Starting temperature and humidity monitoring...");
}

void loop() {

  kiwisiot.run();

  static unsigned long lastSend = 0;

  if (millis() - lastSend >= 2000) {

    lastSend = millis();

    sendDHTData();
  }

  delay(100);
}

Credits

Harshan.M

4 projects • 1 follower

ESP8266 IoT Temperature & Humidity Monitoring

Things used in this project

Hardware components

Software apps and online services

Story

ESP8266 IoT Temperature & Humidity Monitoring

Introduction

Project Overview

Components Required

Software and Tools Required

Circuit Connections

Working Principle

System Data Flow

KiwisIoT Dashboard Configuration

Dashboard Monitoring

Testing and Results

Applications

Future Improvements

Conclusion

Technologies Used

Tags

Schematics

ESP8266 IoT Temperature & Humidity Monitoring

Code

# ESP8266 IoT Temperature & Humidity Monitoring

Credits

Harshan.M

Comments

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ESP8266 IoT Temperature & Humidity Monitoring

ESP8266 IoT Temperature & Humidity Monitoring

Things used in this project

Hardware components

Software apps and online services

Story

ESP8266 IoT Temperature & Humidity Monitoring

Introduction

Project Overview

Components Required

Software and Tools Required

Circuit Connections

Working Principle

System Data Flow

KiwisIoT Dashboard Configuration

Dashboard Monitoring

Testing and Results

Applications

Future Improvements

Conclusion

Technologies Used

Tags

Schematics

ESP8266 IoT Temperature & Humidity Monitoring

Code

# ESP8266 IoT Temperature & Humidity Monitoring

Credits

Harshan.M

Comments

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