IR Transceiver data structure

["Ian B" <Ian@xxxxxxx>]

Hi Steve

These are extracts from the header of my program. One gives you the
structure of the 15 bytes as it stands at the moment. For this to make
any
sense you have to understand how I am analysing the IR signal. Here is
another extract from the program giving a little more detail.

Don't forget though that I intend to wrap all this data up in a SNAP
packet
(www.hth.com). The DLL to strip this packet from my 15 bytes is
available
>from
is liable to change so don't go writing to much yet. I will let folks
know
when things settle down. We are getting closer though I am pleased to
say.

Extracts.............

; During the commentary here I am talking about 'bits' a lot. This is NOT
a
bit represented in IR
; by a high and low IR pulse but a length of time that the IR pulse is
EITHER high or low for.
; Bits are represented in the data byte by a 0 or 1 to represent their
length. This has nothing
; to do with their actual value
;              
--------      ----     
--------      ----
;           1T
   2T    1T  1T  1T    2T    1T 
1T
;         
----         
----     
----          ----
; would be 01000100 where 0 is a short time period (T) and a 1 is a long
one
(2T). In all the IR
; signals I have analysed the start bit has been of varying length but
all
further bits can
; be represented by one of the two time periods present in the same
signal.
This includes PWM
; as found in Sony etc., Space coded as in my Sanyo telly and RC5 in a
lot
of Phillips kit.
; A typical signal is around 24 bits using this coding method. I have
74
available in the packet
; Byte 7 bit 1 is always an on period after the start bits. It then
goes
off/on/off/on/off etc.


; Byte1      ; Command Byte. First four bits for
repeat
            counter if
packet inbound to PIC (bits 7-4)
; Byte1      ; Command Byte. Next two bits for
number of
            start bit ON
timeouts (long start bits) (bits 3 & 2)
; Byte1      ; Command Byte. Next two bits for
number of
            start bit OFF
timeouts (long start bits) (bits 1 & 0)
; Byte2      ; # of data bits in packet where a
bit is an on or off time
; Byte3      ; Start bit ON duration
; Byte4      ; Start bit OFF duration
; Byte5      ; '0' duration
; Byte6      ; '1' duration
; Byte7      ; Data byte
; Byte8      ; Data byte
; Byte9      ; Data byte
; Byte10      ; Data byte
; Byte11      ; Data byte
; Byte12      ; Data byte
; Byte13      ; Data byte
; Byte14      ; Data byte
; Byte15      ; Data byte

Ian B



>-----Original Message-----
>From: Steve D [mailto:steve@xxxxxxx]
>Sent: 08 August 2002 14:41
>To: ukha_d@xxxxxxx
>Subject: Re: [ukha_d] Re: Hv Multizone Update(IR MESSENGER)
>
>
>Ian,
>you coulsnt send me a copy of this data could you?
>I'd love to help write some PC software for logic and controlling of
your
>units :)
>I will probably be one of your first customers for these units!
>----- Original Message -----
>From: "ianwbird" <Ian@xxxxxxx>
>To: <ukha_d@xxxxxxx>
>Sent: Thursday, August 08, 2002 1:47 PM
>Subject: [ukha_d] Re: Hv Multizone Update(IR MESSENGER)
>
>
>> Yep, all my versions of the PCB's etc. and the bits soldered on
in
>> strange and wonderful places are all part of the prototyping
stage.
>> Once I have the schematic correct then the PCB is fine, it's just
the
>> bit in the middle. If you are prototyping on vero board you are
a
>> better man than I. All I managed to do was short things out and
get
>> very confused that way.
>>
>> Ian B
>>
>> p.s. I managed to get my IR units talking to each other last
night.
>> There was simplex comms accross 485 and the IR controlled unit at
the
>> other end actually did something depending on the button pressed
on
>> the remote. Cool!! ;-) Just as icing on the cake I had the PC
>> evesdropping on the data using the 485 to serial converter
;-)))
>
>
>
>For more information: http://www.automatedhome.co.uk
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