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aquaticus / nexus433

433MHz temperature and humidity sensor receiver that integrates with home automation systems.
GNU General Public License v3.0
191 stars 32 forks source link

10th bit in the dataframe #24

Closed OndrejBakan closed 3 years ago

OndrejBakan commented 4 years ago

Hello there,

first of all thank you for your work! I am tinkering in Universal Radio Hacker and I think I found the meaning of the 10th bit in Nexus protocol. When you push the button on the sensor and force the update, this bit is 1. Otherwise (automatic periodic broadcast) the bit is 0.

Tested on the Auriol WEATHER STATION 4-LD5370 (from Lidl).

aquaticus commented 4 years ago

This feature probably makes pairing more reliable. Not sure if this is the "standard" function, I'd bet it's rather unique for Auriol station (but this is just guessing). I never saw an extra button before. Thanks for information. If this makes a problem in your case just mask the bit. Maybe it's worth implementing this in the main branch anway.

On Mon, 28 Sep 2020 at 04:10, OndrejBakan notifications@github.com wrote:

Hello there,

first of all thank you for your work! I am tinkering in Universal Radio Hacker and I think I found the meaning of the 10th bit in Nexus protocol. When you push the button on the sensor and force the update, this bit is 1. Otherwise (automatic periodic broadcast) the bit is 0.

Tested on the Auriol WEATHER STATION 4-LD5370 (from Lidl).

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OndrejBakan commented 4 years ago

I saw the button in some other sensors too (Digoo DG-R8S for example). There's actually button for TX, button to switch °C/°F on the sensor's display and a 3 position switch to select the channel. It's usually in the battery compartment.

Nope, no problem for me. Actually, I am not even using your project (yet), but I found it very helpful while trying to decode the temperature by myself (my goal is to use Arduino / ESP32 to read the data).

aquaticus commented 4 years ago

Let me know if you develop something for ESP32. I have no time for that but it's more useful.