Protocol decoder:am230x
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 | |
| Name | AM230x/DHTxx/RHTxx |
|---|---|
| Description | Aosong AM230x/DHTxx/RHTxx humidity/temperature sensor protocol |
| Status | supported |
| License | GPLv2+ |
| Source code | decoders/am230x |
| Input | logic |
| Output | am230x |
| Probes | SDA |
| Optional probes | — |
| Options | device |
The am230x protocol decoder decodes the Aosong AM230x/DHT11 temperature and humidity sensor single-wire protocol.
Hardware
See the am230x directory for example capture files.
Models
| Model | Microcontroller | Temperature | Humidity | Datasheet |
|---|---|---|---|---|
| Aosong AM2301 | Unknown SOIC-10 | ? | ? | |
| Aosong AM2302 | ST STM8S103F3 (8S103F3P6), SOIC-20 | analog | analog | |
| Aosong AM2303 | ST STM8S103F3 (8S103F3P6), SOIC-20 | Dallas DS18B20 | analog | |
| Aosong AM2305 | ? | ? | ? | |
| Aosong AM2306 | ? | ? | ? | |
| Aosong AM2320 | ? | ? | ? | ? |
| Aosong AM2321 | ? | ? | ? | ? |
| Aosong AM2322 | ? | ? | ? | ? |
| Aosong DHT11 | Unknown SOIC-14 | analog | analog | |
| RTH03 | ? | ? | ? | https://www.sparkfun.com/products/10167 |
These parts are often renamed or rebadged.
Aosong AM2301
Device, top
Device, bottom
Device PCB, open
Device PCB, top
Device PCB, bottom
Aosong AM2302
Device, top
Device, bottom
PCB, top
PCB, bottom
STM8S103F3
Sensor
Debris
Aosong AM2303
Device, top
Device, bottom
PCB, top
PCB, bottom
DS18B20
Debris
Aosong DHT11
Device, top
Device, bottom
Device PCB, open
Device PCB, top
Device PCB, bottom
Protocol
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.
The actual payload consists of a humidity value, a temperature value, and a checksum.
Resources
- Aosong website
- Adafruit: DHT sensor tutorial
- arduino.cc: DHTLib Contains a mapping of common renames