
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.
4, Dimensions (Unit: mm)


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.

Relative Humidity:
- Resolution:0.1%RH
- Repeatability:±1%RH
- Accuracy:25℃±5%RH
- Interchangeability:Fully interchangeable
- Response Time:1/e(63%)25℃ 20s 1m/s air 6s
- Sluggish:<±0.3%RH
- Long-term Stability:<±0.5%RH/yr
Temperature
- Resolution:0.1℃
- Repeatability:±.2℃
- Accuracy:25℃±0.5℃
- Response Time:1/e(63%)20s
Electrical Characteristics
- Power Supply:DC2.7-5.5V
- Current:1mA
- Standby:60μA
- Sampling Period:>2s
- Pin Definition I2C mode : 1.VDD 2.SDA 3.GND 4.SCL
- Pin Definition 1 Wire mode : 1.VDD 2.SDA 3.GND 4.GND
his is a low cost humidity and temperature sensor with a single wire digital interface.
The sensor is calibrated and doesn't require extra components so you can get right to measuring relative humidity and temperature.
DHT11 has output calibrated digital signal. It utilizes exclusive digital-signal-collecting-technique and humidity sensing technology, assuring its reliability and stability. Its sensing elements is connected with 8-bit single-chip computer. Every sensor of this model is calibrated in accurate calibration chamber and the calibration-coefficient is saved in type of programme in OTP memory, when the sensor is detecting, it will cite coefficient from memory.
If you application requires higher accuracy or a broader measurement range, please consider the DHT22.
Features:
- Relative humidity and temperature measurement
- Extra components are not needed
- Long transmission distance low power consumption
- Dimensions: 12.5 x 16 x 5.5mm
- Outstanding long-term stability and reliability
- Low power consumption
Specifications:
- Power supply: 3.0 to 5.5V DC
- Output signal: digital signal via single-bus
- Operating range: humidity 20 to 90%RH, temperature 0 to 50°C;
- Interchangeability: fully interchangeable
- Range of meauring humidity: 20% to 90%RH(0-50℃temperature compensation)
- Range of meauring temperature: 0 to +50℃
- Accuracy of measuring humidity: ±5.0%RH
- Accuracy of measuring temperature: ±2.0℃
- Response time: <5s
- Supply Current:
Mesurement: 0.5 to 2.5 mA
Average: 0.2 to 0.5 mA
Stand by: 100 to 150 uA
Package Contents:
- Digital Humidity Temperature Sensor