DHT11 Temperature and Humidity Sensor Module

Overview

DHT11 Temperature and Humidity Sensor Module with adapter board, indicator LED, and cable. A ready-to-use digital sensor module featuring the DHT11 sensor pre-mounted on a PCB with pull-up resistor, power LED indicator, and 3-pin connector cable. Eliminates the need for external components — simply plug in and start reading temperature and humidity data. Fully compatible with Arduino, ESP32, STM32, Raspberry Pi, and all microcontroller platforms.

Specifications

Parameter	Value
Model	DHT11 Adapter Module
Sensor	DHT11
Measurement	Temperature + Humidity
Temperature Range	0°C – 50°C
Temperature Accuracy	±2°C
Humidity Range	20% – 90% RH
Humidity Accuracy	±5% RH
Resolution	1°C / 1% RH
Supply Voltage	3.3V – 5V
Output	Single-wire digital signal
Sampling Rate	1 reading per second (1Hz)
Cable Length	~20cm (3-pin connector)
Onboard LED	Power indicator
PCB	Adapter board with pull-up resistor
Operating Temperature	0°C to +50°C
Storage Temperature	-20°C to +60°C

Module Components

Component	Description
DHT11 Sensor	Temperature + humidity sensing element
Pull-up Resistor	10kΩ onboard — no external resistor needed
Power LED	Indicates module is powered
3-pin Connector	VCC, DATA, GND with cable
PCB Adapter	Clean mounting and easy wiring

Pin Configuration

Pin	Color	Description
VCC	Red	3.3V or 5V power
DATA	Yellow	Digital data output
GND	Black	Ground

Wiring (Arduino)

DHT11 Module	Arduino
VCC	5V
DATA	Pin 2 (any digital pin)
GND	GND

Wiring (ESP32)

DHT11 Module	ESP32
VCC	3.3V
DATA	GPIO4 (any GPIO)
GND	GND

Wiring (Raspberry Pi)

DHT11 Module	Raspberry Pi
VCC	3.3V (Pin 1)
DATA	GPIO4 (Pin 7)
GND	GND (Pin 6)

Features

• Ready to use — no external components needed
• Onboard pull-up resistor — plug and play operation
• Power LED indicator — confirm module is powered
• 3-pin cable included — easy connection to breadboard or PCB
• Single wire digital output — simple 1-wire protocol
• Low power consumption — ideal for battery projects
• Compact adapter board — easy PCB mounting
• Stable readings — onboard filtering and conditioning
• Wide voltage range — works at 3.3V and 5V

Recommended Libraries

• Arduino: DHT sensor library by Adafruit
• ESP32/ESP8266: DHT sensor library by Adafruit
• Python (RPi): Adafruit_DHT
• Install via Arduino IDE: search DHT sensor library

Arduino Code Example

#include <DHT.h>

#define DHTPIN 2
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();
  Serial.println("DHT11 Module Ready");
}

void loop() {
  delay(2000); // Wait 2 seconds between readings

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

  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT11!");
    return;
  }

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

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

ESP32 Code Example

#include <DHT.h>

#define DHTPIN 4
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
}

void loop() {
  delay(2000);
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  Serial.printf("Temp: %.1f°C  Humidity: %.1f%%\n", t, h);
}

DHT11 vs DHT22 Comparison

Feature	DHT11	DHT22
Temperature Range	0–50°C	-40–80°C
Temp Accuracy	±2°C	±0.5°C
Humidity Range	20–90%	0–100%
Humidity Accuracy	±5%	±2%
Sampling Rate	1Hz	0.5Hz
Price	Lower	Higher
Best For	Indoor basic use	Precision measurement

⚠️ Notes

• Minimum 2 second delay between readings — sensor needs time to stabilize
• Do not place near heat sources — affects temperature accuracy
• Indoor use only — not suitable for outdoor or harsh environments
• Humidity range 20–90% — readings outside this range unreliable
• Check for NaN in code — sensor occasionally returns invalid data
• Keep cable short — long cables can cause signal interference
• Avoid condensation — high humidity environments may damage sensor

Applications

• Indoor temperature and humidity monitoring
• Weather station projects
• Greenhouse and plant monitoring
• HVAC control systems
• Smart home automation
• Air quality monitoring
• Baby room climate control
• Server room temperature alerts
• Arduino and ESP32 learning projects
• IoT sensor node development