DHT12 datasheet(6/14 Pages) ETC1

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system communication, otherwise I2C Communication after the selected communication

mode, in power during the sensor communication remains the same if you want to change,

as a way, please power on again, and select communication according to operational

requirements. When you select I2C Communication,SCL For the microprocessor DHT12

Communication between the synchronization.

7.4

Serial data (SDA）

SDA PIN for a three-State structure, used for reading and writing data. Specific

communication timing, see the detailed description of the communications.

EightI2C And single-bus communication protocol

DHT12 Serial interface, read sensor signals and power loss, do the optimization. Sensors

with a single bus,

I2C Two way output, communication mode switch, easy to use. Bus to SCL Signal cable power

levels to determine their bus communication mode: when power on SCL Remained low for a

single bus communication mode when power on SCL To maintain a high level I2C

Communication mode. Single main line single bus communication is fully compatible with the

company's other products;I2C Communication in accordance with I2C Standard protocol

address can be directly linked to I2C On the bus (bus allowed only one product), no additional

wiring, operation is very simple. Read DHT12 The sensor, please in strict accordance with the

two types of communication protocols and timing. Specific details see single bus

communication protocol and I2C Communication protocol details.

8.1DHT12 Sensor I2C Communication protocol

DHT12 Support I2C Way to communicate, in full accordance with I2C Standard protocol

prepared, can be linked directly in I2C Bus sensor SDA PIN I2C Data bus,SCL 接 I2C Clock bus,

customers need to both pin a 1KΩ~10KΩPull-up resistor.I2C Address for 0xB8(DEV SEL); I2C

Communication rate cannot be higher than 400KHZ。

BYTE ADDR

R/W

Desc.

Note

0x00

Humidity integral

digits

Relative humidity

values

0x01

Humidity scale

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