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Summary of Contents for aosong DHT12
- Page 1 Digital temperature Product Product 超 Stan For more information,...
- Page 2 A product overview DHT12 Digital temperature and humidity sensor is a calibrated digital output record of temperature and humidity, DHT11 The upgrade product. Application-specific digital temperature and humidity sensor module and semiconductor, ensure high reliability and excellent long-term stability. DHT12 With a single bus, and standards I...
- Page 3 Four, dimensions (unit:mm） 图 1DHT12 Profile of best-inch External interface:1:VDD 2:SDA 3: GND 4:SCL Five, sensor performance 5.1 Relative humidity 5.2 Temperature 表 1： DHT12 Relative humidity tables 表 2： DHT12 Relative performance table Paramete Condit Paramete Condit ions ions Resolution ℃...
- Page 4 Rp<25 kΩ 100% 低电平输入电压 下降 高电平输入电压 上升 100% VDD = 5V kΩ VIN = VSS 开 输出电流 三 态 （ 关 µA ） 采样周期 在 25℃和 1m/s 气流的条件下，达到一阶响应 63%所需要的时间。 在挥发性有机混合物中数值可能会高一些。见说明书应用储存信息。 此数值为 VDD =5.0V 在温度为 25℃时，2S/ 次，条件下的平均值。 广州奥松电子有限公司 电话：020-36042809 / 36380552 www.aosong.com...
- Page 5 图 2：25 ℃时 DHT12 Relative humidity maximum error 图 3: Temperature sensor temperature Max Six, electrical characteristics errors Electrical characteristics, such as energy consumption, high and low level input and output voltage, depending on the power supply. Table 3 Details DHT12 The electrical characteristics, without marking, it means that the power supply voltage is V。...
- Page 6 I C 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 I C Communication protocol details.
- Page 7 Data refer to the single bus data processing sample. ◎I C Interface attributes Must be in strict accordance with the following distribution specification, otherwise the sensor does not work. Communication protocol: 图 13 I C Communication Reading time: protocol 广州奥松电子有限公司 电话：020-36042809 / 36380552 www.aosong.com...
- Page 8 8.3Single bus communication (ONE-WIRE） ◎Single bus description DHT12 A simplified single-bus communication. That only a single bus cable, system of data exchange,Control is done by a single bus communication. Devices (hosts) through a drain or a three-State port is connected to the data cable to allow device does not send data will be released when the bus, while letting the other device uses the bus;...
- Page 9 Temperature scale Check digit 00111000+00001000+00011010+10000110=11100000(Check digit) receive data properly: Humidity:00111000 (Binary) =>56 (Decimal)00001000(Binary)=>8 (Decimal) =>Humidity=56.8%RH Temperature: temperature low 8Bit 为 1 It indicates sampling the temperature to minus-temperature 00011010 (Binary) =>26 (Decimal) 10000110 (Binary,Ignore 8Bit)=>6(Decimal) 广州奥松电子有限公司 电话：020-36042809 / 36380552 www.aosong.com...
- Page 10 的 SDA PIN is input, detect external signals. Step two: Hosting by SDA Data bus output low level and low level for at least 200ms Released by bus,DHT12 Detects a bus free, issue 80µs Low level immediately 80µs High level signal, as shown below: 图 17 Signal...
- Page 11 DHT12 The data bus output 40 Data, continue to output low level 50µs Free bus to enter State after. The same time DHT12 An environmental temperature and humidity data, and records the data automatically after entering hibernation. ◎Typical circuit 图 19 Typical circuit diagram Microprocessor and DHT12 Connections on a typical application circuit shown in the figure,DATA After pulling on the microprocessor I/O Connected to the port.
- Page 12 Induction of resistance humidity sensor layer affected by interference of chemical vapors, chemical diffusion in sensitive layer may lead to measuring drift and sensitivity. In a pure environment, polluting substances slowly released. The recovery process described below will - 11 广州奥松电子有限公司 电话：020-36042809 / 36380552 www.aosong.com...
- Page 13 Signal quality of wire affect the communication distance and traffic quality, recommended use high quality shielded cables. 7、 Manual welding welding information at the highest 300 cTemperature conditions of contact time shall be less than 5 Second. - 12 广州奥松电子有限公司 电话：020-36042809 / 36380552 www.aosong.com...
- Page 14 Company products used in those special applications do not make any warranties, guarantees or written statements. Company about the reliability of its products used in products or circuits are not making any promises. - 13 广州奥松电子有限公司 电话：020-36042809 / 36380552 www.aosong.com...
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