Data Sheet

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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" format signal as shown in fig:
End signal:
DHT11 the DATA pin output 40-bit data, the continued output low 50 microseconds after the
entry into the state, due to the pull-up resistor attendant goes high. But DHT11 temperature and
humidity inside the test-retest data, and record the data, awaiting the arrival of an external signal.
8. Application Information
1. Working and storage conditions
The proposed scope of work may result in up to 3% RH temporary drift of the signal. Return
to normal working conditions, the sensor calibration status will slowly recover. To speed up the
recovery process can be found in "recovery process." The use of the product will accelerate the aging
process for a long time under abnormal operating conditions.
Avoid placing components on a long-term condensation and dry conditions and the following
environments.
A. smoke
B. Acid or oxidizing gases such as sulfur dioxide, hydrochloric acid
Recommended Storage Environment
Temperature：10~40℃ Humidity：60% RH or less
2. Effects of exposure to chemical substances
Sensing resistive humidity sensor will be disturbed chemical vapor layer, the diffusion layer in
the induction of chemicals may cause drift and measurement sensitivity. In a clean environment,
slowly release contaminants out. The recovery process described below to accelerate the process.