DHT11/22 Temperature and Humidity Module

DHT11

This is a calibrated digital temperature and humidity module with an onboard sensor DHT11. It can be used for detecting ambient temperature and humidity, through the standard single-wire interface.

Note: This sensor does not come with a cable

Specifications

• Temperature:
  • Resolution: 1°C
  • Accuracy: ±2℃
  • Measuring range: 0°C ~ 50°C
• Humidity
  • Resolution: 1%RH
  • Accuracy: ±5%RH (0~50°C)
  • Measuring range: 20%RH ~ 90%RH (25°C)
• Operating voltage : 3.3V ~ 5.5 V
• Recommended storage condition
  • Temperature: 10°C ~40°C
  • Humidity: 60%RH or below

DHT22

The DHT22 is a basic, low-cost digital temperature and humidity sensor. Due to its low cost and ease of use, you’ll find project examples all over the web for these simple sensors.

Compared to the DHT11, this sensor is more precise, and more accurate and works in a bigger range of temperature/humidity, at the cost of size and a slightly higher cost.

The DHT22 uses a capacitive humidity sensor and thermistor to measure the surrounding air and then provides that data via a digital output signal on the data pin. They’re easy to use, however, they require some careful timing to grab data.

Specifications