AM2301 DHT21 PDF

BME N Figure 8c. Surfaces showing deviation of each sensor from the true relative humidity as a function of temperature and humidity. Blue shows low readings and red are high. A sensor with hysteresis will tend to give low readings if it has recently been exposed to dry air and tend to read high when it has recently been exposed to wet air. Here I use the term hysteresis only to refer to the lagging of the sensor behind the current conditions.

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The relative humidity and temperature measurement, calibration, all digital output 2. Long distance signal transmission 5 low energy consumption 7. It dedicated digital module acquisition technology and the temperature and humidity sensor technology, ensure that the product has a very high reliability and excellent long-term stability.

Sensor includes a capacitive moisture element and a DS18B20 temperature measuring device, and connected to a high-performance 8-bit microcontroller. So the product has excellent quality, super fast response, strong anti-jamming capability, very high cost performance advantages.

Every AM sensor calibration in the extremely precise humidity calibration laboratory. Calibration coefficient in the form of a program stored in the OTP memory, inside the sensor in detecting signal processing process to invoke these calibration coefficient. Single wire serial interface, the system integration becomes simple and fast. Ultra small volume, low power consumption, the signal transmission distance of 20 meters, making it a all kinds of optimal choice of even the most demanding applications, product lead for the three core shielded wire.

Sensor after power on, wait for 1 s to cross the unstable state, during this period do not need to send any instructions. Single bus interface: Single bus data for communication between microprocessor and AM and synchronization, a communication time about 5 ms, specific format in the following illustration, the current data of 40 bits, high in first out.

For example: Application-specific digital module acquisition technology and the temperature and humidity sensing technology, to ensure that products with high reliability and excellent long-term stability.

The sensor includes a capacitive humidity sensitive element and a NTC temperature measurement devices, and connected with a high-performance 8-bit microcontroller. The product has excellent quality, fast response, anti-interference ability, cost and other advantages. Calibration coefficients stored in the form of a program in OTP memory, internal sensor detection signal processing to call these calibration coefficients. The single wire serial interface, the system integration becomes simpler and quicker.

The ultra-small size, low power consumption, signal transmission distance up to 20 meters, it is the best choice for a variety of applications and even the most demanding applications. The product is a 4-pin single row pin package. Convenient connection Special packages can be provided according to user needs.


DHT21 Digital Temperature & Humidity Sensor (AM2301)



Library 25- AM2301 (DHT21) sensor for STM32F4


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