DHT22

Part: DHT22 (AM2302)

Type: Calibrated Digital Temperature and Humidity Sensor

Description: A calibrated digital temperature and humidity sensor using a standard single-bus interface, offering higher accuracy and a wider range than DHT11, with a humidity range of 0-99.9 %RH and a temperature range of -40 to 80°C.

Operating Conditions:

• Supply voltage: 3.3V-5V
• Operating temperature: -40 to 80°C
• Operating humidity: 0 to 99.9 %RH

Absolute Maximum Ratings:

• Max supply voltage: 5.5V
• Max storage humidity: Below 60%RH
• Max storage temperature: 40°C

Key Specs:

• Humidity resolution: 0.1 %RH
• Humidity accuracy: ±2 %RH (at 25°C)
• Temperature resolution: 0.1 °C
• Temperature accuracy: ±0.5°C
• Data bus pull-up resistor: ~5.1k Ω
• Single-bus data format: 40 bits (Humidity High Byte, Humidity Low Byte, Temperature High Byte, Temperature Low Byte, Checksum)
• Host start signal low time: At least 800 μs (typically 1 MS)
• Sensor response signal: 80 μs low, then 80 μs high

Features:

• Calibrated digital output
• Single-bus interface
• Higher accuracy and wider range than DHT11
• Automatic sleep mode after data acquisition
• Checksum for data integrity

Applications:

• Ambient temperature and humidity detection
• Microcontroller-based environmental monitoring systems

Package:

• 3-pin module (VCC, GND, DOUT)

This product is a calibrated digital temperature and humidity sensor used for detecting ambient temperature and humidity. It uses DHT22 (AM2302) with a standard single-bus interface. It has higher accuracy and a wider range than DHT11.