TCM 218943¶

New in version 8.0.

Feature	Support
Sending
Receiving
Config

Supported Brands

Brand	Protocol
TCM 218943	tcm

Sender Arguments

None

Config

{
  "devices": {
    "weather": {
      "protocol": [ "tcm" ],
      "id": [{
        "id": 104,
      }],
      "temperature": 22.70,
      "humidity": 50.00,
      "battery": 1
     }
  },
  "gui": {
    "weather": {
      "name": "Weather Station",
      "group": [ "Outside" ],
      "media": [ "all" ]
    }
  }
}

Option	Value
id	0 - 255
temperature	-39.9 - 59.9
humidity	0 - 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

Protocol

The tcm protocol sends 74 pulses like

194 1035 194 1994 194 1994 194 1035 194 1994 194 1035 194 1035 194 1035 194 1035 194 1035 194 1035 194 1035 194 1035 194 1035 194 1035 194 1035 194 1035 194 1035 194 1994 194 1994 194 1035 194 1035 194 1994 194 1035 194 1035 194 1035 194 1035 194 1035 194 1994 194 1994 194 1994 194 1035 194 1035 194 1035 194 1994 194 1994 194 8037

The next step is to transform this output into groups of 2 pulses.

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

194 1035
194 1994

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. We then get the following output:

011010000000000000110010000011100011

Each (group) of numbers has a specific meaning:

ID: 1 till 8
Battery: 9
Button: 12
Humidity: 17 till 24
Temperature: 25 till 36

ID : 01101000 | Bat : 0 | But : 0 | Hum : 00110010 | Temp : 000011100011

The ID is defined as a binary number.
The Battery indicates low battery with 1.
The Button is 1, if the button on the sensor is pressed.
The Temperature is a 12 bits wide 2’s complement signed binary number represents the actual temperature value in 0.1 °C units. DEC(AAAAAAAAAAAA)/10
The Humidity is defined as a binary number.

ID : 104 | Bat : OK | But : not pressed | Hum : 50% | Temp : 22.7°C

This protocol was created for pilight with the help of this thread: http://forum.arduino.cc/index.php?topic=136836.0 (german)

Comments

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

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TCM 218943¶