Somfy RTS protocol

Before the first frame of a button press there is some kind of wakeup pulse of 9415 us long followed by 89565 us of silence.

Parameters

  • Frequency: 433.42 Mhz
  • Modulation: ASK/OOK
  • Encoding: Manchester code, rising edge = 1, falling edge = 0
  • Payload Data length: 56 bit
  • Symbol Width: 1208 us

TELIS 4 RTS 433 MHz transmitter
4 channels (means you can control 4 individual receivers)
Up, Down arrow button (open,close action)
Bar (stop, center position action)

Round button selects channel 1,2,3,4 or all.

  • decoders/decode_somfy.c

    Decode Somfy RTS from a demodulated bitstream

[todo: upload c code]

https://github.com/dimhoff/radio_stuff/blob/master/decoders/decode_somfy.c

 

/**
* decode_somfy.c - Decode Somfy RTS packets from bit stream
*
* This tool decodes the Somfy RTS packets from a raw bit stream. The bit
* stream is what comes out of the OOK demodulator and should be sampled 36 us
* per sample. The samples are packed into a byte with the MSB the first bit
* and the LSB the last.
*
* The Addresses of the remotes can be resolved to human readable names. This
* is done by creating a file called 'remotes.txt' in the current directory.
* The file should contain a hexadecimal remote address followed by the name.
*