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The
Linet nodes support only one output (relay etc) and one input (switch)
(also has
PWM output, A/D input and Trig inputs, Serial out and in, all available
depending on the mode the node is put into). To generate more I/O you
need
to use it as a data device i.e send it some data and it will reproduce the
data
on the serial out line. Decode the data to get I/O. That's
the
job of the PIC.
I
had considered the CMOS switches but weren't sure of crosstalk
performance
etc. I assumed they would offer no advantage in terms of clicking
during
switching over relays.I had relays available so I designed them
in.
Relays were OK if you are only switching a couple of inputs. Maybe I
should re-think local amplifier switching versus centralised source
switching
card design decision if performance of CMOS switches are fine for line
level
signals. Comments anyone who has used them ?
Cheers
Shane
Hi Shane
Just
a quick one , Why do you need a pic between the stereo module and the Linet
node? I assumed the Linet node would have i/o available to control the
digital
pot...
Also i seen a circuit in circuit cellar of
a 4 audio (line level i assume)way selector using a 4052 cmos chip. I
thought about using 2 4051 chips which would give 8 sources. Just a
thought...
Frank Mc
ps had a look at the pics isnt she
cute.
For more information: http://www.automatedhome.co.uk
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