DHT22 Temperature and Humidity Sensor Module

The DHT22 Temperature and Humidity Sensor Module is a digital temperature and humidity sensor measuring -40°C to 80°C temperature and 0 to 100% RH humidity with a 0.1% RH humidity resolution and 0.1°C temperature resolution, operating from 3.3V to 5V with low power consumption. The temperature and humidity sensor’s 0.1% RH resolution means the module reports humidity in fine tenths-of-a-percent steps — unlike the DHT11 which reports only in whole-number percent steps, the DHT22 captures gradual humidity changes that would be invisible to coarser-resolution sensors.

The dht22 datasheet, the sensor outputs both temperature and humidity as a single 40-bit digital packet through its single-wire interface — the first 16 bits carry humidity data (including the 0.1% fractional step), the next 16 bits carry temperature data, and the final 8 bits are a checksum for error detection. This dht22 sensor packet-based digital protocol differs fundamentally from analog sensors like the LM35 or HR202 — the temperature humidity sensor self-validates each reading via the checksum, so corrupted readings from electrical noise are detectable rather than silently incorrect.

the dht22 sensor module’s 0-100% RH range on paper includes condensing humidity, but sustained operation in condensing environments can damage the sensor over time — the dht22 module is best suited for non-condensing humidity monitoring. A practical choice for builders and enthusiasts, sensor module available at StemVolt. This sensor supports smart home automation, data logging, and greenhouse monitoring applications with reliable temperature and humidity sensing.

Related Products:

• Checkout DHT11 Humidity And Temperature Sensor Module

Features:

• 0.1% RH humidity and 0.1°C temperature resolution for fine tracking
• 0-100% RH and -40°C to 80°C ranges in single sensor
• 40-bit checksum-verified digital packet for error-detectable readings
• 3.3V to 5V low power for battery-powered IoT nodes
• DHT22 named sensor with extensive Arduino library and tutorial support

Technical specifications:

 Applications:

• DHT22 Module used for Arduino high-resolution humidity station build
• College project uses temperature and humidity sensor for environmental demo
• IoT node uses dht22 sensor for India climate data fine-resolution logging
• Greenhouse uses dht22 sensor module for precise plant humidity control
• Lab uses temperature humidity sensor for condensation threshold monitoring

Package includes:

• 1 x DHT22 Temperature and Humidity Sensor Module