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DHT11 Datasheet

Humidity and Temperature Sensor

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Document: Datasheet
Date: 20-Jun-12
Model #: 3732
DHT11 - Humidity and Temperature Sensor
The DHT11 is a basic, low-cost digital temperature
and humidity sensor. It uses a capacitive humidity
sensor and a thermistor to measure the
surrounding air, and spits out a digital signal on the
data pin (no analog input pins needed).
Its fairly simple to use, but requires careful timing to
grab data. The only real downside of this sensor is
you can only get new data from it once every 2
Product’s Page:
Full range temperature compensated
Relative humidity and temperature
Calibrated digital signal
Outstanding long-term stability
Extra components not needed
Long transmission distance
Low power consumption
4 pins packaged and fully interchangeable
This sensor includes a resistive-type humidity measurement component and an NTC temperature
measurement component, and connects to a high-performance 8-bit microcontroller, offering
excellent quality, fast response, anti-interference ability and cost-effectiveness. Each DHT11
element is strictly calibrated in the laboratory that is extremely accurate on humidity calibration. The
calibration coefficients are stored as programmes in the OTP memory, which are used by the
sensor’s internal signal detecting process.
The single-wire serial interface makes system integration quick and easy. Its small size, low power
consumption and up-to-20 meter signal transmission making it the best choice for various
applications, including those most demanding ones. The component is 4-pin single row pin
Free Datasheet
Page 1

2 Sunrom Technologies
Your Source for Embedded Systems
Visit us at
Free Datasheet
Page 2

Typical Application
DHT11’s power supply is 3-5.5V DC. When power is supplied to the sensor, do not send any
instruction to the sensor in within one second in order to pass the unstable status. One capacitor
valued 100nF can be added between VDD and GND for power filtering.
SDK (Software Development Kit)
Download source code + project articles
by clicking following link
It contains details for AVR, PIC and
Arduino projects.
3 Sunrom Technologies
Your Source for Embedded Systems
Visit us at
Free Datasheet
Page 3
Part Number DHT11
Manufactur Sunrom
Description Humidity and Temperature Sensor
Total Page 7 Pages
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