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DHT21 digital temperature and humidity sensor is a digital signal output with a calibrated temperature and humidity combined sensor. It uses a dedicated digital modules and acquisition of temperature and humidity sensor technology to ensure that products with high reliability and excellent long term stability. Sensor consists of a capacitive sense element and a wet NTC temperature measurement devices, and with a high-performance 8-bit microcontroller connected. Therefore, the product has excellent quality, fast response, anti-interference ability, high cost and other advantages. Each DHT21 sensors are extremely accurate calibration of humidity calibration chamber. Calibration coefficients stored in the OTP program memory, internal sensor, signal processing in the detection process to call these calibration coefficients. Single-wire serial interface, allowing the system to become simpler and quicker integration. Ultra-small size, low power consumption, signal transmission distance up to 20 meters, making it a wide range of applications and even the most demanding applications is the best choice. Product is 4-pin single-row pin package. Easy connection, special packages can be provided according to user needs.
Temperature measurement range
Temperature measurement accuracy
1). relative humidity and temperature measurement
2). All calibration, digital output
3). excellent long-term stability
4). No additional components
5). long distance signal transmission
6). ultra-low power
7). 4-pin package
8). completely interchangeable
Testing and inspection equipment
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