Note: DHT21 has been renamed AM2301

1. Relative humidity and temperature measurement

2. Full calibration, digital output

3. Excellent long-term stability

4. No extra parts required

5. Ultra-long signal transmission distance

6. Ultra low energy consumption

7. 4- pin installation

8. Fully interchangeable

AM2301/DHT21 product overview

AM2301 / DHT21 digital temperature and humidity sensor is a digital signal containing a calibrated signal output of the temperature and humidity combined sensor . It uses dedicated digital module acquisition technology and temperature and humidity sensing technology to ensure that the product has extremely high reliability and excellent long-term stability. Electrical sensor comprises a capacitance -type sensing the wet element, and a NTC for the temperature measuring element, and with a phase high-performance 8-bit microcontroller is connected. Therefore, the product has the advantages of excellent quality, ultra-fast response, strong anti-interference ability, and high cost performance. Each AM2301/ DHT21 sensor is calibrated in an extremely accurate humidity calibration room. The calibration coefficients are stored in the OTP memory in the form of programs, and these calibration coefficients are called in the sensor’s internal detection signal processing. Single- wire serial interface, system integration becomes simpler and quicker. Ultra-small size, extremely low power consumption, and signal transmission distance of up to 20 meters or more, making it the best choice for various applications and even the most demanding applications. The product is a 4- pin single-row pin package. Convenient connection, special packaging form can be provided according to user needs.