View source for Watshome YT6018-2 weather station

'''Watshome YT6018-2 weather station

[http://appeltaart.mine.nu/arduino/SpaceLen.zip SpaceLen.zip Arduino library]

The Watshome wireless sensor is realy a Fujian Youtong device see [http://www.youtonggroup.com/yt/details.asp?id=1110&catid=258&typeid=2 http://www.youtonggroup.com]

With the protocol analyser from [http://www.nethome.nu www.nethome.nu] I got the following sample: 

[[File:Yt6018-2-proto.PNG]]

The 8ms gap is the start of the package.
Is is a space length protocol like X10. 
A '1' is a pulse followed by a gap of three times the pulse duration.
A '0' is a pulse followed by a gap of the same duration as the pulse.

so in the example the package is:
 1111 1010 1010 0000 1100 1011 1111 0000 0000
 ---- ---- --CC TTTT TTTT TTTT ---- ---- ----
    F    A

 CC is the channel
 00 ch1
 01 ch2
 10 ch3

 T is the temperature times 10
In the above example the temperature is 0000:1100:1011 which is 203. So it is 20.3 degrees Celsius.

[[File:Yt6018-2-neg.PNG]]
 1111 1010 1000 1111 1101 1011 1111 0000 0000
 ---- ---- --CC TTTT TTTT TTTT ---- ---- ----

the sensor on channel 1 has 1111:1101:1011 which is -37. -3.7 degrees Celsius.