https://w.electrodragon.com/w/index.php?action=history&feed=atom&title=DHT22_SDKDHT22 SDK - Revision history2026-06-04T23:40:36ZRevision history for this page on the wikiMediaWiki 1.37.2https://w.electrodragon.com/w/index.php?title=DHT22_SDK&diff=31157&oldid=prevChao at 12:51, 13 May 20212021-05-13T12:51:44Z<p></p>
<p><b>New page</b></p><div>== Data ==<br />
DATA = 16 bits RH data + 16 bits Temperature data + 8 bits check-sum check-sum check-sum<br />
Example: MCU has received 40 bits data from AM2302 as<br />
0000 0010 1000 1100 - 0000 0001 0101 1111 - 1110 1110<br />
16 bits RH data - 16 bits T data - check sum<br />
Here we convert 16 bits RH data from binary system to decimal system,<br />
0000 0010 1000 1100 → 652<br />
Binary system →Decimal system<br />
RH=652/10=65.2%RH <br />
Here we convert 16 bits T data from binary system to decimal system,<br />
0000 0001 0101 1111 → 351<br />
Binary system → Decimal system<br />
T=351/10=35.1 <br />
When highest bit of temperature is 1, it means the temperature is below 0 degree Celsius.<br />
Example: 1000 0000 0110 0101, T= minus 10.1℃<br />
16 bits T data<br />
Sum= 0000 0010 + 1000 1100 + 0000 0001 + 0101 1111 = 1110 1110<br />
Check-sum = the last 8 bits of Sum = 1110 1110<br />
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== Datasheet ==<br />
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* [[File:DHT22-datasheet.pdf|DHT22]]<br />
[[category: DHT22]]</div>Chao