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Adafruit DHT22 385 User Manual

Product codes
385
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Aosong(Guangzhou) Electronics Co.,Ltd
---------------------------------------------------------------------------------------------------------------------
Tell: +86-020-36380552, +86-020-36042809
Fax: +86-020-36380562
Address: No.56, Renhe Road, Renhe Town, Baiyun District, Guangzhou, China
- 2 -
4.
4.
4.
4. Dimensions:
Dimensions:
Dimensions:
Dimensions: (unit----mm)
(unit----mm)
(unit----mm)
(unit----mm)
Pin
Pin
Pin
Pin sequence
sequence
sequence
sequence number:
number:
number:
number:
1
1
1
1 2
2
2
2 3
3
3
3 4
4
4
4 (from
(from
(from
(from left
left
left
left to
to
to
to right
right
right
right direction).
direction).
direction).
direction).
5.
5.
5.
5. Operating
Operating
Operating
Operating specifications:
specifications:
specifications:
specifications:
(1)
(1)
(1)
(1) Power
Power
Power
Power and
and
and
and Pins
Pins
Pins
Pins
Power's voltage should be 3.3-6V 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
wave filtering.
(2)
(2)
(2)
(2) Communication
Communication
Communication
Communication and
and
and
and signal
signal
signal
signal
Single-bus data is used for communication between MCU and AM2303, it costs 5mS for single time
communication.
Accuracy
humidity +-2%RH(Max +-5%RH);
temperature +-0.2Celsius
Resolution or sensitivity
humidity 0.1%RH;
temperature 0.1Celsius
Repeatability
humidity +-1%RH;
temperature +-0.2Celsius
Humidity hysteresis
+-0.3%RH
Long-term Stability
+-0.5%RH/year
Sensing period
Average: 2s
Interchangeability
fully interchangeable
Pin
Pin
Pin
Pin
Function
Function
Function
Function
1
1
1
1
VDD----power
VDD----power
VDD----power
VDD----power supply
supply
supply
supply
2
2
2
2
DATA--signal
DATA--signal
DATA--signal
DATA--signal
3
3
3
3
NULL
NULL
NULL
NULL
4
4
4
4
GND
GND
GND
GND