Evohome / Evotouch Wireless protocol?

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Re: Evohome / Evotouch Wireless protocol?

Postby colintd » Tue Oct 17, 2017 11:22 am

dty> Sorry about very slow reply! Yes, the second UART is wired to the async data wires on all the current busware modules. It wasn't on the very old COC module, but is a fairly easy patch is needed.
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Re: Evohome / Evotouch Wireless protocol?

Postby colintd » Tue Oct 17, 2017 11:28 am

The schematic for the latest CUL module is on the busware website here http://busware.de/tiki-download_file.php?fileId=43
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Re: Evohome / Evotouch Wireless protocol?

Postby kiwi3 » Sun Oct 29, 2017 10:03 pm

hox wrote:Continuing the last post.

I inverted the signal after the sync FF00 plus additional 2 bits (ff008) to get
aaaaaaaaaaaaaaaaaaff00833555355a9a96a966569aa565aa6a966569aa565aa6695a699696a9
so I get the sync bits 335553
After the 29th byte I make a Manchester decoding:
0ee7946f13de51bc4f58da6791eb7b98a7b40000000
At this point I could not decode futher like it is in https://www.domoticaforum.eu/download/file.php?id=1396

Also the RFBee and CUL data showed different results.

The SDR work was a test only, to see real data of the CC100 RF output.
In the end I'm interested in an Arduino + CC1100 modul.
Does anyonyone have a running Arduino-Code which communictes with EVOtouch


Hox

Hi Hox,

Think you have a couple of problems;
- You shouldn't invert
- bit length = 26us . Not sure if you have that correctly set
- remove preamble (including start/stop: 01111111110000000001011001100101010101010110010101)
- remove end of block (excluding start/stop: 10101100)
- remove start(0) and stop(1) bits surrounding each sequence of 8 bits (1 byte)
- per byte: reverse the order (LSB first). e.g. 10011010 becomes 01011001
- after doing all that, manchester decode

that should get you going.
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Re: Evohome / Evotouch Wireless protocol?

Postby hox » Tue Nov 07, 2017 8:25 pm

Thanks kiwi3,
your recipe was realy gooood.
I thought, start and stop bits are only used in RS323 serial comunications and should not be in the wireless comunication
seen by SDR.

Also my idea was, the start and stop bits comes in only by the serial comunication of the cc1101 and the MCU (SPI interface).
As honeywell uses manchester coding the start and stop bits are hardly to be seen in the data stream.

Thanks for your support kiwi3.

hox
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