Temperature and Humidity Module DHT11 Product Manual For more information, please visit：www.aosong.
1. Product Overview DHT11 digital temperature and humidity sensor is a calibrated digital signal output of the temperature and humidity combined sensor. It uses a dedicated digital modules capture technology and the temperature and humidity sensor technology to ensure that products with high reliability and excellent long-term stability. Sensor includes a resistive element and a sense of wet NTC temperature measurement devices, and with a high-performance 8-bit microcontroller connected . 2.
5. Parameters Relative Humidity Resolution：16Bit Repeatability：±1%RH Accuracy：25℃ ±5%RH Interchangeability：Fully interchangeable Response time：1/e (63%)25℃ 6s 1m/s Air 6s Hysteresis：<±0.3%RH Long-term stability：<±0.5%RH/yr Temperature Resolution：16Bit Repeatability：±1℃ Accuracy：25℃ ±2℃ Response time：1/e (63%) 10S Electrical Characteristics Power supply：DC 3.3～5.5V Aosong Guangzhou Electronics Co., Ltd. Order by phone：4006 305378 Enterprise QQ：4006305378 -2www.aosong.
Supply current：Measure 0.3mA Standby 60μA Sampling period：Secondary Greater than 2 seconds Pin Description 1. VDD supply 3.3 ~ 5.5V DC 2. DATA serial data, single-bus 3. NC NC 4. GND grounding, power negative 6. Typical circuit Connecting the typical application circuit shown above the microprocessor and DHT11, DATA pull-up and microprocessor I/O port. 1. A typical application circuit recommended cable length shorter than 20 meters with a 5.
external approximately 5.1kΩ pull up resistor, so that when the bus is idle, the state is high. Because they are master-slave structure, only the host calls a slave, a slave to answer, so the host access devices must strictly follow the sequence of a single bus, if there is a sequence of confusion, the device will not respond to the host.
Data Timing Diagram Note: The host reads temperature and humidity data from DHT11 always previous measurements, such as the two measured time interval is long, please read twice in a row is the second time in real time temperature and humidity values. ◎Peripheral reading step Communication between master and slave can be completed by the following steps (peripherals (such as a microprocessor) to read step DHT11 data).
Step four: The 40 bit data output by the DHT11 DATA pin, the microprocessor according to the change of I/O level receive 40 bits of data, a data format of "0": high level and low level of 50 microseconds and 26-28 microsecond, format data "1": low level 50 microsecond plus 70 microsecond high.
High concentrations of chemical pollution can cause damage to the sensor sensing layer completely. 3. Temperature Effect Relative humidity of the gas is largely dependent on temperature. Therefore, when measuring the humidity should be possible to ensure that the humidity sensor works at the same temperature.
including: a variety of costs, damages costs, attorney fees, and so on. 11. Quality Assurance The company offers a three-month quality assurance (calculated from the date of shipment from) their direct purchasers of the product. Data sheet of the company published the technical specifications of the product shall prevail. If the warranty period, the product is proved to be defective quality, the company will provide free repair or replacement.
