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https://sigrok.org/w/index.php?title=Protocol_decoder:Am230x&diff=9890
Protocol decoder:Am230x
2014-10-13T19:25:07Z
<p>Jroemer: add AM2305 and AM2306 to resources (they use the same protocol)</p>
<hr />
<div>{{Infobox protocol decoder<br />
| id = am230x<br />
| name = AM230x/DHTxx<br />
| description = Aosong AM230x/DHTxx humidity/temperature sensor protocol<br />
| status = supported<br />
| license = GPLv2+<br />
| source_code_dir = am230x<br />
| image = [[File:Aosong dht11 top.jpg|250px]]<br />
| input = logic<br />
| output = am230x<br />
| probes = SDA<br />
| optional_probes = <br />
}}<br />
<br />
The '''am230x''' protocol decoder decodes the [http://www.aosong.com/en/products/index.asp?classid=313&name=Humidity%20&%20temp%20Sensor/OEM Aosong AM2301/AM2302/AM2303/DHT11] temperature and humidity sensor single-wire protocol.<br />
<br />
== Hardware ==<br />
<br />
<gallery><br />
File:Aosong am2301 top.jpg|<small>AM2301, top</small><br />
File:Aosong am2301 bottom.jpg|<small>AM2301, bottom</small><br />
File:Am2301 pcb open.jpg|<small>AM2301 PCB, open</small><br />
File:Am2301 pcb top.jpg|<small>AM2301 PCB, top</small><br />
File:Am2301 pcb bottom.jpg|<small>AM2301 PCB, bottom</small><br />
File:Aosong dht11 top.jpg|<small>DHT11, top</small><br />
File:Aosong dht11 bottom.jpg|<small>DHT11, bottom</small><br />
File:Dht11 pcb open.jpg|<small>DHT11 PCB, open</small><br />
File:Dht11 pcb top.jpg|<small>DHT11 PCB, top</small><br />
File:Dht11 pcb bottom.jpg|<small>DHT11 PCB, bottom</small><br />
</gallery><br />
<br />
See the [http://sigrok.org/gitweb/?p=sigrok-dumps.git;a=tree;f=am230x am230x] directory for example capture files.<br />
<br />
== Protocol ==<br />
<br />
A custom single-wire protocol (not to be confused with the Dallas 1-Wire protocol!) is used to get the measured values from the sensor.<br />
<br />
The actual payload consists of a humidity value, a temperature value, and a checksum.<br />
<br />
== Resources ==<br />
<br />
* [http://www.aosong.com/en/home/index.asp Aosong] (vendor website)<br />
** [http://www.aosong.com/en/products/details.asp?id=110 AM2301] ([http://meteobox.tk/files/AM2301.pdf datasheet])<br />
** [http://www.aosong.com/en/products/details.asp?id=117 AM2302] ([http://www.adafruit.com/datasheets/Digital%20humidity%20and%20temperature%20sensor%20AM2302.pdf datasheet])<br />
** AM2303 ([http://www.aosong.com/asp_bin/Products/en/AM2303.pdf datasheet])<br />
** [http://aosong.com/en/products/details.asp?id=121 AM2305] ([http://www.aosong.com/asp_bin/Products/en/AM2305.pdf datasheet])<br />
** [http://aosong.com/en/products/details.asp?id=115 AM2306] ([http://www.aosong.com/asp_bin/Products/en/AM2306.pdf datasheet])<br />
** [http://www.aosong.com/en/products/details.asp?id=109 DHT11] ([http://akizukidenshi.com/download/ds/aosong/DHT11.pdf datasheet])<br />
* [https://learn.adafruit.com/dht/ Adafruit: DHT sensor tutorial]<br />
** [https://github.com/adafruit/DHT-sensor-library GitHub: Adafruit DHT-sensor-library]<br />
* [http://playground.arduino.cc/Main/DHTLib arduino.cc: DHTLib]<br />
<br />
[[Category:Protocol decoder]]</div>
Jroemer