[Sublab-elektronikrunde] [dezentrale-members] doorbell bits

[Steven Chamberlain]

The messages never repeat the same digit three times, so it might be
https://en.wikipedia.org/wiki/Manchester_code

I wonder how long the messages are, and how to detect the start of them.

phantomix at macht-albern.de wrote:
> - DOOR OPEN -
> SLAVE	000101011010110010101010
> 1
> MASTER	0001010110

This might be three messages that overlap slightly:

    msg0:   0001010110 (from master)
    msg1:          00010110010101010100 (from slave)
    msg2:                              0001010110 (from master)

So maybe it's possible to open the door by sending only this part:

(00)0101100101010101(00)
  = 0 0 1 0 0 0 0 0 .

and this response just means "OK" or "ACK":

(00)01010110(00)
  = 0 0 0 1 .

and if that's right, our doorbell code is just this:

(00)1010011001010101(00)
  = 1 1 0 1 0 0 0 0 . (the handset should ring)

Tschau,
-- 
Steven
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