product overview
DHT12 digital temperature and humidity sensor is a calibration with the digital signal output temperature and humidity sensor, DHT11 upgrade products. It uses a dedicated digital module acquisition technology and semiconductor temperature and humidity sensors to ensure that the product has a high reliability and excellent long-term stability.
DHT12 has a single bus and standard I2C two kinds of communication, and single bus communication is fully compatible with DHT11. Standard single bus interface, the system integration has become simple and quick. With ultra-small size, low power consumption, suitable for a variety of applications. I2C communication using standard communication timing, the user can be directly linked to the I2C communication bus, no additional wiring, easy to use. Two kinds of communication methods are free to switch, the user is free to choose, easy to use, should be a wide range of areas. Products for the 4-lead, easy to connect, special package can be provided in accordance with user needs.
2, the application of HVAC, dehumidifiers, testing and testing equipment, consumer goods, automatic control, data loggers, weather stations, home appliances, humidity control, medical and other related humidity detection control.
3, the product highlights completely interchangeable, low cost, long-term stability, relative humidity and temperature measurement, long signal transmission distance, digital signal output, accurate calibration, low power consumption, standard single bus digital interface, standard I2C bus digital interface , The communication method is free to choose.
5. Power supply pin (VDD GND) The DHT12 has a supply voltage range of 2.7V to 5.5V. 7.3 Serial Clock Input (SCL) The SCL pin is used to select the sensor communication mode and the clock line for I2C communication. When SCL is low after power-on, it indicates that the user selects single-bus mode communication, otherwise it will communicate with I2C. After selecting the communication mode, the sensor communication mode will remain unchanged during power-on. If you want to change the communication mode, Electricity, and according to the operation requirements to select the communication mode. When I2C communication is selected, SCL is used for communication synchronization between the microprocessor and the DHT12.
6. Serial Data (SDA) The SDA pin is a tri-state structure for reading and writing sensor data. Specific communication timing, see the detailed description of the communication.
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