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PDF DHT11 Data sheet ( Hoja de datos )

Número de pieza DHT11
Descripción Humidity & Temperature Sensor
Fabricantes D-Robotics 
Logotipo D-Robotics Logotipo



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DHT11 Humidity &
Temperature Sensor
D-Robotics UK (www.droboticsonline.com)
DHT11 Temperature & Humidity Sensor features a
temperature & humidity sensor complex with a
calibrated digital signal output.
D-Robotics
7/30/2010
Free Datasheet http://www.datasheetlist.com/

1 page




DHT11 pdf
3. Typical Application (Figure 1)
Figure 1 Typical Application
Note: 3Pin Null; MCU = Micro-computer Unite or single chip Computer
When the connecting cable is shorter than 20 metres, a 5K pull-up resistor is recommended;
when the connecting cable is longer than 20 metres, choose a appropriate pull-up resistor as
needed.
4. Power and Pin
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.
5. Communication Process: Serial Interface (Single-Wire Two-Way)
Single-bus data format is used for communication and synchronization between MCU and
DHT11 sensor. One communication process is about 4ms.
Data consists of decimal and integral parts. A complete data transmission is 40bit, and the
sensor sends higher data bit first.
Data format: 8bit integral RH data + 8bit decimal RH data + 8bit integral T data + 8bit decimal T
data + 8bit check sum. If the data transmission is right, the check-sum should be the last 8bit of
"8bit integral RH data + 8bit decimal RH data + 8bit integral T data + 8bit decimal T data".
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Free Datasheet http://www.datasheetlist.com/

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