Datasheet

www.aosong.com
DHT20 Data Sheet
Version:V1.0 —— May 2021
11 / 13
Read temperature and humidity data
Note: The sensor needs time to collect. After the host sends a measurement command (0xAC), delay more than 80
milliseconds before reading the converted data and judging whether the returned status bit is normal. If the status bit [Bit7] is 0,
it means that the data can be read normally. When it is 1, the sensor is busy, and the host needs to wait for the data processing
to complete.
8 Signal Conversion
8.1 Relative Humidity Conversion
The relative humidity RH can be calculated according to the relative humidity signal S
RH
output by SDA through the
following formula (the result is expressed in %RH):
%100*)
2
S
([%]RH
20
RH

8.2 Temperature Conversion
The temperature T can be calculated by substituting the temperature output signal S
T
into the following formula:
(The result is expressed in temperature
℃
):
50-200*
2
S
][T
20
T
）（℃ 
9 Environmental Stability
If the sensor is used in equipment or machinery, make sure that the sensor used for measurement and reference-
sense the same temperature and humidity. If the sensor is placed in the equipment, the response time will be
prolonged, so ensure that sufficient measurement time is reserved in the program design. The DHT20 sensor is
tested according to the company standard of the temperature and humidity sensor of Aosong. The performance of
the sensor under other test conditions is not guaranteed and cannot be used as a part of the sensor's performance.
Especially for specific occasions required by users, no promises are made.
10 Packing Instructions
10.1 Outer Dimensions
DHT20 uses pallet packaging, each tray packed with 50 sensors, each ten plastic tray attached to a vacant plastic
tray as a sealing cover, that is, 11 plastic tray sealed in an anti-static shielding bag and packing, a total of 500