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Flat square one big

IR bit format

- (13 or 12 pulses) - pulse length wide or short (like morse: mark or space )

given 1=long and 0=short it can be decoded as bit stream

format of bit stream

KEY   ABCDEF GHIJKLMNOPQRSTUVWXYZ 
1     001000 00000000000000000010 
      000010

A-F are prefix..where

A-B are always 0

CD=10 or EF =10 alternating on each single key press

if long key press the CDEF signature is the same for every repeat

This helps detect single clicks vs long holding…