DHT11 Temperature-Humidity Sensor

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Product Link

DHT11 Temperature-Humidity SensorOpenELAB

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

1. Power the Sensor: Connect the VCC pin to a power supply (3.3V to 5.5V) and the GND pin to ground.

2. Connect the Data Pin: Connect the DATA pin to a digital input pin of your microcontroller to read the temperature and humidity data.

3. 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");
}