Digital Temperature and Humidity Sensor Module DHT22

Digital Temperature and Humidity Sensor Module DHT22

Sensors
DET5655
Part.No: DHT-22
€7.95
In Stock
Immediate Dispatch
DHT22 (AM2302) Digital Temperature & Humidity Sensor Module – calibrated single-wire interface, 3.3V–5.5V supply, 1.5mA operating current. Higher accuracy and wider range than DHT11, compatible with Arduino and ESP32 projects.

 

The DHT22 (AM2302) — MPN: DHT-22 — is a calibrated digital temperature and humidity sensor module designed for makers, students, and engineers who need reliable ambient environment monitoring. Unlike its simpler sibling the DHT11, the DHT22 offers higher measurement accuracy and a wider sensing range, making it the go-to choice for weather stations, smart home systems, and data-logging applications. It communicates over a single-wire digital interface, minimising the GPIO pins required on your microcontroller.

Key Features

  • Calibrated Digital Output: Sensor data is pre-calibrated at the factory → no external ADC or signal conditioning required
  • Single-Wire Communication: Uses a proprietary one-wire protocol → only one data pin needed on your board
  • Wide Supply Voltage Range (3.3V – 5.5V): Operates at both 3.3V and 5V logic levels → compatible with Arduino, ESP32, and Raspberry Pi without level shifting
  • Low Operating Current (1.5mA): Minimal power draw → ideal for battery-powered or low-energy IoT nodes
  • Dual Sensing: Measures both temperature and humidity in a single module → saves board space and cost
  • Improved Performance vs DHT11: Higher accuracy and broader measurement range → suitable for more demanding environment monitoring tasks

Pinout & Wiring

PINSymbolDescription
1VCCPower supply – connect to 3.3V or 5V
2DATASingle-wire digital data output – connect to a GPIO pin
3GNDGround – connect to GND

Wiring note: A pull-up resistor (typically 4.7kΩ–10kΩ) on the DATA line to VCC is recommended for reliable communication. Many ready-made modules include this resistor onboard — check your specific board before adding one externally.

Compatibility

  • Arduino UNO / Nano (5V): Fully compatible — connect VCC to 5V, DATA to any digital GPIO. Use the DHT sensor library by Adafruit.
  • ESP32 / ESP8266 (3.3V): Fully compatible — connect VCC to 3.3V. The 3.3V operating voltage makes it safe for 3.3V-only boards without a level shifter.
  • Raspberry Pi (3.3V GPIO): Compatible when powered at 3.3V; use a suitable Python library such as Adafruit CircuitPython DHT.

Typical Applications

  • Home weather stations: Log indoor/outdoor temperature and humidity with an Arduino or ESP32 and display readings on an LCD or web dashboard.
  • Smart HVAC control: Feed real-time humidity and temperature data to a relay module to automate fans, heaters, or humidifiers.
  • Greenhouse monitoring: Keep plant environments within optimal conditions by triggering alerts when thresholds are exceeded.
  • IoT data logging: Combine with an ESP32 and MQTT broker to push sensor readings to platforms like Home Assistant or ThingSpeak.
  • Educational projects: Ideal for university lab assignments and maker workshops where reliable, easy-to-use sensors are needed.

Technical Specifications

ParameterValue
InterfaceDigital – Single Wire
Typical Input Voltage3.3V / 5V / 5.5V DC
Operating Current1.5mA
Sensor TypeTemperature & Humidity
Communication ProtocolSingle Wire
Onboard SensorDHT22 (AM2302)
MPNDHT-22

FAQ

Q: What is the difference between DHT11 and DHT22?
A: The DHT22 (AM2302) provides higher measurement accuracy and a wider sensing range compared to the DHT11. If your project requires more precise readings, the DHT22 is the better choice.

Q: Do I need an external pull-up resistor?
A: A 4.7kΩ–10kΩ pull-up resistor on the DATA line is generally recommended by the datasheet. Many pre-assembled modules include it onboard, so check before adding one yourself.

Package Contents: 1 × DHT22 (AM2302) Temperature & Humidity Sensor Module

⚠ Note: Avoid exposing the sensor to condensation or direct water contact. Allow a warm-up period of at least 1–2 seconds after power-on before reading data for accurate results.
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