Nexus¶

Feature	Support
Sending
Receiving
Config

Supported Brands

Brand	Protocol
Nexus Weather Stations	nexus
Digoo DG-R8H/DG-R8S Weather Stations	dgr8h
Sencor SWS 21TS Weather Stations	sencor21ts

Sender Arguments

None

Config

{
   "devices": {
     "weather": {
       "protocol": [ "nexus" ],
       "id": [{
         "id": 97,
         "channel": 1
       }],
       "temperature": 18.90,
       "humidity": 41.00,
       "battery": 1
     }
  },
  "gui": {
    "weather": {
      "name": "Weather Station",
      "group": [ "Outside" ],
      "media": [ "all" ]
    }
  }
}

Option	Value
id	0 - 255
channel	0 - 3
temperature	-39.9 - 59.9
humidity	10 - 99
battery	0 - 1

Optional Settings

Device Settings

Setting	Default	Format	Description
temperature-offset	0	number	Correct temperature value
humidity-offset	0	number	Correct humidity value

GUI Settings

Setting	Default	Format	Description
temperature-decimals	2	number	How many decimals the GUIs should display for temperature
humidity-decimals	2	number	How many decimals the GUIs should display for humidity
show-temperature	1	1 or 0	Don’t display the temperature value
show-humidity	1	1 or 0	Don’t display the humidity value
show-battery	1	1 or 0	Don’t display the battery value
show-id	1	1 or 0	Don’t display the sensor id
show-channel	1	1 or 0	Don’t display the sensor channel

Protocol

The transmitter sends 72 pulses, each 2 pulses making up a bit, so a message has 36 bits. The first pulse is 500us. The second pulse can be 1000us (‘zero’ bit), 2000us (‘one’ bit) or 4000us (sync bit). The sync bit separates identical messages, of which there can be 11 of them repeated in a transmission.

Message structure from https://forum.pilight.org/showthread.php?tid=3351&pid=22798#pid22798 :

ID ID ID CC         8-bit ID, the two least significant might encode the channel
BF CC               4 bits of flags:
                                                B  =1 battery good
                                                F  =1 forced transmission
                                                CC =  channel, zero based
TT TT TT TT TT TT   12 bits signed integer, temp in Celsius/10
11 11               const / reserved
HH HH HH HH         8 bits, either
                                                - humidity (or 1111 xxxx if not available); or
                                                - a CRC, e.g. Rubicson, algorithm in source code linked above

Table Of Contents

Nexus¶