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Digital-output relative humidity & temperature
sensor/module – DHT11
Resisitive-type humidity and temperature module/sensor
1. Feature & Application:
* Full range temperature compensated * Relative humidity and temperature measurement
* Calibrated digital signal *Outstanding long-term stability *Extra components not needed
* Long transmission distance * Low power consumption *4 pins packaged and fully
interchangeable
2. Description:
DHT11 output calibrated digital signal. It utilizes exclusive digital-signal-collecting-technique
and humidity sensing technology, assuring its reliability and stability. Its sensing elements is
connected with 8-bit single-chip computer.
Every sensor of this model is temperature compensated and calibrated in accurate calibration
chamber and the calibration-coefficient is saved in OTP memory.
Small size & low consumption & long transmission distance(20m) enable DHT11 to be suited
in all kinds of harsh application occasions. Single-row packaged with four pins, making the
connection very convenient.
1
|—12mm—|__ |—12mm—|__ |5.5mm|
15.5mm 15.5mm 15.5mm
1pin 4pin ——
8mm 3mm 8mm
«1 f—2.54mm -{ }—2.54mm
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3. Technical Specification:
Model DHT11
Power supply 3-5.5V DC
Output signal digital signal via single-bus
Sensing element Polymer resistor
Measuring range humidity 20-90%RH;
temperature 0-50 Celsius
Accuracy humidity +-4%RH (Max +-5%RH);
temperature +-2.0Celsius
Resolution or
sensitivity
humidity 1%RH; temperature 0.1Celsius
Repeatability humidity +-1%RH; temperature +-1Celsius
Humidity hysteresis +-1%RH
Long-term Stability +-0.5%RH/year
Sensing period Average: 2s
Interchangeability fully interchangeable
Dimensions size 12*15.5*5.5mm
4. Dimensions: (unit----mm)
Front view Back view Side view
2
MCU
VDD V_DD
4pm
G75 D
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DHT12
5. Typical application
3Pin-NULL, MCU=Microcomputer or single-chip computer
6. Operating specifications:
(1) Power and Pins
Power's voltage should be 3-5.5V DC. When power is supplied to sensor, don't send any
instruction to the sensor within one second to pass unstable status. One capacitor valued 100nF
can be added between VDD and GND for power filtering.
(2) Communication and signal
Single-bus data is used for communication between MCU and DHT11.
7. Electrical Characteristics:
Item Condition Min Typical Max Unit
Power supply DC 3 5 5.5 V
Current supply Measuring 0.5 2.5 mA
Stand-by 100 Null 150 uA
Average 0.2 Null 1 mA
3