Teknihall GT-WT-02¶

Feature	Support
Sending
Receiving
Config

Supported Brands

Brand	Protocol
Teknihall GT-WT-02	teknihall

Sender Arguments

None

Config

{
  "devices": {
    "weather": {
      "protocol": [ "teknihall" ],
      "id": [{
        "id": 108
      }],
      "temperature": 18.90,
      "humidity": 41.00,
      "battery": 1
     }
  },
  "gui": {
    "weather": {
      "name": "Weather Station",
      "group": [ "Outside" ],
      "media": [ "all" ]
    }
  }
}

Option	Value
id	0 - 3
unit	0 - 15
temperature	-15 - 60
humidity	20 - 99
battery	0 - 1

Optional Settings

Device Settings

Setting	Default	Format	Description
humidity-offset	0	number	Correct humidity value
temperature-offset	0	number	Correct temperature 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-wind	1	1 or 0	Don’t display the wind value
show-battery	1	1 or 0	Don’t display the battery value

Comments

This weather station is available at Aldi. Please be aware that there are several types of Teknihall weather stations and sensors available. Not all types might be compatible.

Please be aware that the ID of a sensor could change after you replace the batteries.

Protocol

The protocol sends 76 pulses like:

532 2128 532 4256 532 4256 532 2128 532 4256 532 4256 532 2128 532 2128 532 2128 532 2128 532 2128 532 2128 532 2128 532 2128 532 2128 532 2128 532 4256 532 2128 532 4256 532 4256 532 4256 532 4256 532 2128 532 2128 532 2128 532 4256 532 4256 532 4256 532 2128 532 2128 532 2128 532 4256 532 4256 532 2128 532 2128 532 2128 532 2128 532 9044

The last 2 pulses are the footer. These are meant to identify the pulses as genuine. We don’t it for further processing. The next step is to transform this output into 38 groups of 2 pulses (and thereby dropping the footer pulses).

If we now look at carefully at these groups you can distinguish two types of groups:

540 2128
540 4256

So the first group is defined by a low 2nd, the second group has a high 2nd pulse. So we take either of these two pulses to define a 0 or a 1. In this case we say a high 2nd pulse means a 1 and a low 2nd pulse means a 0. The binary conversion could look as follows:

0101111100111000000011001011001010111

Each (group) of numbers has a specific meaning:

ID: 0 till 7
Temperature: 14 till 23
Humidity: 24 till 30

01011111 001110 0000001100 1011001 010111

The ID is defined as a binary number
The Temperature is defined as a binary number and represents the temperature
The Humidity is defined as a binary number and represents the humidity

This protocol was created for pilight with the help of this thread: http://forum.pilight.org/Thread-Connect-digital-weather-sensor

Table Of Contents

Teknihall GT-WT-02¶