RE: Could be useful project, anyone tried this?

["David Ward" <d.ward@xxxxxxxxxx>]

I use a cheap Argos =A38 doorbell to start our shower pump remotely.
=20
Our shower head is at almost the same height as our water tank so the flow
=
switches on the shower pump don't always start reliably.  I have a
wireless=
doorbell transmitter hidden in the wall cavity behind the shower controls =
which is triggered by a reed switch and a magnet in the shower control
knob=
itself.
The receiver sits next to the shower pump and it's modified output drives
a=
n old relay coil which is cable-tied to the flow sensor reed switch
housing=
.
=20
The cheapest wire free doorbells that Argos and Wickes sell have a PCB
that=
has spaces for extra components,  by changing a link and moving the Amplif=
ier transistor you end up with a receiver that gives an open collector
outp=
ut pulse of 5 seconds or so every time the bell button is pressed.
=20
For our shower start circuit I added a simple one shot circuit RC and
Schmi=
tt inverter circuit to save transmitter battery power as the unit takes
pow=
er all the time that the button is pressed.  It's only been running now
for=
6 weeks, so I can't say how long the transmitter battery lasts.=20
=20
If anyone is interested I'll see If I have pictures and the schematic.
=20
Dave
_____=20=20

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of G=
ary
Sent: 25 November 2006 14:40
To: ukha_d@xxxxxxx
Subject: [ukha_d] Could be useful project, anyone tried this?



http://www.electronicsinschools.org/page.php?m=3D106&ps=3D103&p=3D414
<http=
://www.electronicsinschools.org/page.php?m=3D106&ps=3D103&p=3D414>=20

Hi,

I was thinking about interfacing a doorbell to my PC so that i can
play any sound. The price of a simple PCB type TX unit is about =A38.=20

You can by the freidland bell push, about =A38 and these with come case,
button, and fully assembled etc, and it has lots of code combinations!

So could be used for lots of diffent tasks where a simple closed
contact is required.

Anyone know how to interface it or tried something like it, the
website already has the timings, they seem a bit like X10?

Regards=20

Gary



=20


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