Digital Temperature and Humidity Sensor DHT22
Digital Temperature and Humidity Sensor DHT22
Digital Temperature and Humidity Sensor DHT22
Digital Temperature and Humidity Sensor DHT22
Digital Temperature and Humidity Sensor DHT22
Digital Temperature and Humidity Sensor DHT22

Digital Temperature and Humidity Sensor DHT22

Sensors
DET5656
Part.No: DHT-22
€7.50
In Stock
Immediate Dispatch
DHT-22 (RHT03) Digital Temperature & Humidity Sensor — single-wire interface, 3.3–6V supply, ±2% RH accuracy. No extra components needed. Works with Arduino, ESP32 and Raspberry Pi projects out of the box.

 

The DHT-22 (also known as RHT03),, is a low-cost digital temperature and humidity sensor that combines a capacitive humidity element and a thermistor in a single compact package. It communicates over a single-wire digital interface, delivering calibrated readings with no additional components required — making it one of the most popular choices for Arduino, ESP32, and Raspberry Pi environmental sensing projects.

Key Features

  • Wide Supply Voltage (3.3–6V): Powers directly from Arduino 5V or ESP32/RPi 3.3V pins — no voltage regulator needed
  • Single-Wire Digital Interface: Requires only one data pin on your microcontroller — keeps your wiring minimal and clean
  • Humidity Range 0–100% RH: Full-range sensing suitable for indoor and outdoor monitoring
  • Temperature Range −40 to +80 °C: Covers environments from cold storage to summer outdoor use
  • ±2% RH Accuracy: Factory-calibrated sensor means reliable readings without manual calibration
  • Low Standby Current (40–50 µA): Ideal for battery-powered IoT projects with sleep cycles
  • Measuring Current 1–1.5 mA: Minimal power draw during active measurement — efficient for portable devices

Pinout & Wiring

PINSymbolDescription
1 (leftmost)VCCPower supply — connect to 3.3V or 5V
2DATASingle-wire digital data — connect to a digital I/O pin
3GNDGround — connect to GND

Wiring note: Connect a 4.7 kΩ–10 kΩ pull-up resistor between the DATA pin and VCC. Many breakout modules include this resistor on-board.

Compatibility

  • Arduino UNO / Nano / Mega (5V): Fully compatible — power from the 5V pin and connect DATA to any digital pin. Use the DHT library by Adafruit.
  • ESP32 / ESP8266 (3.3V): Fully compatible at 3.3V — connect DATA to any GPIO. Use the same Adafruit DHT library or the ESPHome DHT22 component.
  • Raspberry Pi (3.3V): Compatible via GPIO — use the Adafruit_CircuitPython_DHT library or RPi.GPIO with the DHT22 driver.

Typical Applications

  • Home weather stations: Monitor indoor or outdoor temperature and humidity and display data on an LCD or web dashboard
  • Greenhouse & plant monitoring: Automate ventilation or irrigation based on real-time humidity readings
  • HVAC control systems: Provide environmental feedback to smart thermostats and air quality controllers
  • IoT data logging: Send sensor data to cloud platforms (MQTT, ThingSpeak, Home Assistant) for long-term analysis
  • 3D printer enclosures: Monitor filament storage humidity to prevent moisture-related print failures

Technical Specifications

SpecificationValue
InterfaceSingle-wire digital
Supply Voltage3.3–6V DC
Measuring Current1–1.5 mA
Standby Current40–50 µA
Humidity Range0–100% RH
Humidity Accuracy±2% RH
Temperature Range−40 to +80 °C
MPNDHT-22

Frequently Asked Questions

Q: What is the difference between DHT11 and DHT22?
A: The DHT22 offers a wider temperature range (−40 to +80 °C vs 0–50 °C) and better humidity accuracy (±2% RH vs ±5% RH) compared to the DHT11, making it the preferred choice for more demanding applications.

Q: Do I need a pull-up resistor?
A: Yes — a 4.7 kΩ to 10 kΩ resistor between DATA and VCC is required for reliable communication. Check whether your module already includes one before adding it externally.

Package Contents: 1× DHT-22 Temperature & Humidity Sensor

⚠ Note: Minimum sampling interval is 2 seconds — do not query the sensor more frequently or readings may be unreliable.
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