After some help/advice. I need to get 64 output lines (TTL level) from a =
PC . I need the outputs so 1 or all can be accessed at the same time. =
These lines would then be connected to 8 relay interface kits that I can =
purchase from a local electronics place here in Australia.
 I was thinking along the lines of using the parallel port which would =
have 8 x 74ls373 tristate latches connected to it on a common bus from 8 =
lines of the parrallel port. Then each of the latches outputs would be =
connected to the individual realy boards. Also connected to the parallel =
port is a 74ls138 1 of 8 decoder which has the three select lines going =
to 3 of the output lines from the parallel port. The 8 outputs from the =
decoder then connect to the 8 latches to select (enable) each individual =
latch giving me the 64 lines which can be accessed 1 or all at almost =
the same time.
The relay boards are going to be used to switch devices such as =
fireworks and some other things.
Is there an easier way of getting the 64 output lines, can an output =
board be purchased that does this which is not to expensive?
I am also after any help/advice as to the software. As stated it needs =
to access 1 or all of the 64 outputs manually via the computer and also =
I need a sequencing/automated system which can, if possible have timing =
down to the tenth of second or if this is to quick then every 250ms. You =
input the time and which relays to be turned on or off and it would run =
automatically from a start point.
I have some software experience but would have difficulty tackling =
something of this nature. I would be happy to pay someone to do it.
Thankyou.

Peter Bennett

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