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- 2009-09-12bn
- This document describes the protocol for the brightness sensor BS.
- Datagram is of FS20 sensor message type:
- 81 0c 04 ?? 01 01 a0 01 a5 cf xx 00 yy zz
- 81: begin of FS20/FHT communication
- 0c: remaining length of datagram (12 bytes)
- 04: type of datagram
- ??: checksum
- 01 01 a0 01: FS20 fix sequence, always 01 01 a0 01
- a5 cf: FS20 housecode, always a5cf for brightness sensor BS
- xx: sensor #
- 00: always 00
- yy zz: code, see below
- yy zz
- 76543210 76543210
- | ++ ++++++++----- 10 bit resolution brightness value (0..1023)
- |
- +------------------- 0x20 always 1 (= value byte follows)
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