Summary of Contents for Guangzhou Aosong Electronics DHT11
- Page 1 Temperature and Humidity Module DHT11 Product Manual For more information, please visit：www.aosong.com...
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Page 2: Product Overview
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. - Page 3 5. Parameters Relative Humidity Resolution：16Bit Repeatability：± 1%RH Accuracy：25℃ ± 5%RH Interchangeability：Fully interchangeable Response time：1/e (63%)25℃ 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%) Electrical Characteristics Power supply：DC 3.3～5.5V - 2 - Aosong Guangzhou Electronics Co., Ltd.
- Page 4 ◎ Single Bus Description DHT11 device uses a simplified single-bus communication. Single bus that only one data line, the data exchange system, are controlled by a single bus is complete. Device (master or slave) through an open-drain or tri-state port is connected to the data line to allow the device to send data when not able to release the bus, and let other devices use the bus;...
- Page 5 Hosts (MCU) after sending a start signal, DHT11 transition from a low-power mode to high-speed mode, the host until after the end of the start signal, DHT11 send a response signal, send 40bit data acquisition and trigger a letter. Signal transmission shown in fig.
- Page 6 80 micro-notify the second high peripheral is ready to receive data, the microprocessor I / O at this time in the input state detecting I / O with low (DHT11 echo signal) to the wait for 80 microseconds high data receiving and sending signals as shown: - 5 - Aosong Guangzhou Electronics Co., Ltd.
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Page 7: Application Information
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. Bit data "0", "1"... - Page 8 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. If you share a printed circuit board with electronic components heat released in the sensor should be installed as far as possible away from the electronic components, and installed at the bottom of the heat source, while maintaining a well-ventilated enclosure.
- Page 9 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.