DHT11 Temperature-Humidity Sensor

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Introduction

The DHT11 Temperature-Humidity Sensor is a low-cost, easy-to-use digital sensor for measuring temperature and humidity. It is widely used in environmental monitoring, home automation, and weather stations. The sensor consists of a thermistor and a capacitive humidity sensor to measure the surrounding air and provides calibrated digital output.

Features

Low Cost: Affordable solution for temperature and humidity measurement.
Easy to Use: Simple interface with microcontrollers such as Arduino and Raspberry Pi.
Calibrated Digital Output: Provides accurate and reliable measurements.
Wide Range of Applications: Suitable for various applications including HVAC, weather stations, and environmental monitoring.
Stable Performance: Provides stable readings with long-term reliability.

Specifications

Operating Voltage: 3.3V to 5.5V
Temperature Range: 0°C to 50°C
Humidity Range: 20% to 90% RH
Temperature Accuracy: ±2°C
Humidity Accuracy: ±5% RH
Output: Digital signal via a single-bus interface
Sampling Rate: 1 Hz (one reading per second)

Pinout

VCC: Power supply pin (3.3V to 5.5V)
GND: Ground pin
DATA: Serial data pin for digital output

Dimensions

Size: 29.1x18.03mm
Weight:8g

How to Use

Power the Sensor: Connect the VCC pin to a power supply (3.3V to 5.5V) and the GND pin to ground.
Connect the Data Pin: Connect the DATA pin to a digital input pin of your microcontroller to read the temperature and humidity data.
Library and Code Example: Use an appropriate library to read data from the sensor. The following example demonstrates how to use the DHT11 sensor with an Arduino.

// Example code for Arduino

#include "DHT.h"

#define DHTPIN 2     // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11   // DHT11 sensor type

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();
}

void loop() {
  // Wait a few seconds between measurements
  delay(2000);

  // Read temperature as Celsius
  float t = dht.readTemperature();
  // Read humidity
  float h = dht.readHumidity();

  // Check if any reads failed and exit early (to try again).
  if (isnan(t) || isnan(h)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Print the results
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.println(" *C");
}

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// Example code for Arduino #include "DHT.h" #define DHTPIN 2 // Digital pin connected to the DHT sensor #define DHTTYPE DHT11 // DHT11 sensor type DHT dht(DHTPIN, DHTTYPE); void setup() { Serial.begin(9600); dht.begin(); } void loop() { // Wait a few seconds between measurements delay(2000); // Read temperature as Celsius float t = dht.readTemperature(); // Read humidity float h = dht.readHumidity(); // Check if any reads failed and exit early (to try again). if (isnan(t) || isnan(h)) { Serial.println("Failed to read from DHT sensor!"); return; } // Print the results Serial.print("Humidity: "); Serial.print(h); Serial.print(" %\t"); Serial.print("Temperature: "); Serial.print(t); Serial.println(" *C"); }