Digital 2-in-1 Ambient Humidity & Temperature Sensor


The DHT-21 sensor is a technically identical special design of the DHT-22, which is characterized by a much higher accuracy and a larger measuring range, both for temperature and humidity, compared to the smaller DHT-11.

The DHT-21 is also used as room temperature and humidity meter. If it is to be used outdoors, it must be protected from the weather (rain and direct sunlight). If you want to view your sensor data anytime and anywhere on your smartphone, you can do this quickly and easily with an ESP8266 (e.g. NodeMCU or ESP-12), the free available firmware from Sensate, and our Sensate Monitor App, without having to program yourself. In addition, the sensor can be quickly and easily connected to your own smart home with MQTT, or to third-party products via IFTTTT.

Alternative names

DHT 21

Typical applications

Relative Air Humidity Monitoring
Basement Air Humidity Monitoring
Bathroom Air Humidity Monitoring

Monitoring of the ambient temperature
Monitoring of the room temperature

Weather Stations
HVAC (Heating, Ventilation and Air Conditioning) Systems

All this is possible with our Sensate Monitor App for Android and iOS without any programming including rules and automatic notifications on the smartphone.

Technical data

Power supply: 3V (min) – 5V (typical) – 5.5V (max)
Supported Bus Voltage Levels: 3-5V
Max current during conversion: 2.5mA
Max current during standby: 60µA

Humidity measuring range 0 to 100% with ± 2% accuracy
Temperature measuring range -40 to +80°C with ± 0.5°C accuracy
Max. sampling rate: 0.5Hz (once every 2 seconds)

Body size 58.5mm x 26.7mm x 13.8mm
3 wires

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