Hello all,

all the previous talk about IR comms got me excited and renewed my interest
in an old project.  I had a radio link (dissected cordless telephone) which
controlled the buttons on a universal remote (very messy but worked well).
The problem was that the universal remote (Yamaha trace shown below) could
only store about 10 commands.  So I could buy a new universal remote and
again try to simulate button presses with a PIC again very messy or as
bellow.

The only way I could think to be a truly universal remote is  to record the
duration of each pulse , having no prior information about protocol I can
see no other way.  As each of the traces below (button 1) appear quite
unique I cant think of any tricks to reduce data required to store the
pattern.  As for the Omni DVD remote I would require about 65 bytes to store
one command.

I have seen universal remotes say they will work on over 600 brands and
store up to 470 commands.  Any thoughts on how they would do this

The traces below were recorded using the LPT port  and a visual basic
program.  It is not quite to scale as I use no stable time base.  i.e. None
changing segments take less time to process so are stretched out.

 <<...OLE_Obj...>>
Justin

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