RE: Homevision Relay boards ... Interested?

["Phil Harris" <phillip.harris1@xxxxxxx>]

Valid points but just too damn fiddly for what we were looking at I
reckon...

The way we were looking at it you could drive these boards from a PIC if
you
play around with those, from a parallel port on a PC or from H.V. It's just
intended to be a quick and simple way to add a relatively large number of
relays onto an eight bit parallel port.

Phil


> -----Original Message-----
> From: Keith Doxey [mailto:ukha@xxxxxxx]
> Sent: 12 October 2001 20:27
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Homevision Relay boards ... Interested?
>
>
> Why not design a small PCB with 4 relays on it and use a
> PIC12C508 to dirve
> the relays.
>
> The PIC could be programmed with a base address at programming
> time that way
> you wouldnt need any address pins just a few different PIC's
> programmed with
> different addresses. The PIC could be programmed for either serial(1
wire)
> or clocked data (2 wires). That would leave 4 pins for driving the
relays.
>
> PIC12C508 is about a quid.(or less)
>
> Serial data would allow any device capable of RS232 or RS485 to drive
it.
> Clocked data would allow almost anything that could waggle a
> couple of data
> lines to drive it at almost any speed. (Homevision, Comfort,
> Parallel Port)
>
> Serial or Clocked could be chosen by the PIC that was fitted.
>
> People could order "GP Relay Board <a-nn>"
> where a = C (Clocked) or S (Serial)
> nn = Base address.
>
> When you program the PIC to put in the kit you just choose a different
> program to load into it.
>
> By using RS485 line drivers/receivers you could put upto 256 of
> these boards
> on one cable. By using a PIC you can also do clever things like use
> different codes to do do different thing eg codes 1,2,3,4 turn the
> appropriate relays ON whereas 5,6,7,8 would turn the relays off.
> 9,10,11,12
> could pulse the relay for 1 second so the board can be used for either
> momentary or latching purposes.
>
> It would make the board more flexible because it wouldnt just be
> limited to
> HomeVision.
>
> Just a few thoughts....keep us informed.
>
> Keith
>
> -----Original Message-----
> From: Phil Harris [mailto:phillip.harris1@xxxxxxx]
> Sent: 12 October 2001 18:53
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Homevision Relay boards ... Interested?
>
>
>
> Hiya Guys,
>
> Ian B and myself have been sitting here this afternoon trying to
design a
> relay board to control my electric curtains ... we thought that
> instead of a
> purpose built board to do exatcly what I need it might be useful to
have a
> general purpose relay board.
>
> Throwing around ideas we have come up with the following "rough
> description"
> and are wondering whether there would be much interest from the group
for
> this as either a PCB or a built unit.
>
> The board will take up a complete output port on HV. Four of the
> port lines
> will be "relay select" lines, a fifth would be a
"status" line
> (On/Off) and
> a sixth would be used as a "set" line to get the relay board
to read the
> output port and perform the requested setting.
>
> For example to turn on relay 4 you'd set the bottom four lines on the
port
> to OFF,ON,OFF,OFF (Binary Coded Decimal for 4), the "status"
line
> to ON and
> then the "set" line to ON to action the command.
>
> This would give you sixteen individually addressable relay outputs
that
> would retain their state until changed again or until the power went
off.
>
> It was discussed that the remaining two output lines could be
> used as "board
> select" lines which would enable up to 64 individually
> addressable relays to
> be controlled from a single HomeVision output port with the boards
planned
> as being stackable or daisychainable units.
>
> Now, we haven't looked too deeply into this so we have no idea
> what kind of
> costs would be involved or even at the moment what the programming for
the
> output ports would be like but we were wondering what kind of
> interest there
> would be from the group for such a board if we were to get it working.
>
> Anyone interested if we decide to progress this further?
>
> Phil
>
>
>
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