Data Sheet

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Aosong Guangzhou Electronics Co., Ltd. Order by phone：[phone] Enterprise QQ：4006305378 www.aosong.com
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 5.1K
pull-up resistor when greater than 20 meters when the pull-up resistor to reduce the actual situation.
2. When using a 3.3V voltage supply cable length must not be greater than 100cm. Otherwise it
will lead to lack of line drop sensor supply, causing measurement bias.
3. Temperature and humidity values are read out every last measurement result, want to get
real-time data, to be read twice in a row, but not recommended repeatedly read sensors, each sensor
reading interval of more than 5 seconds to obtain accurate data.
7. Serial Communications Description (single-wire bidirectional)
◎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; single bus usually requires an