Re: auto phone dialing

[backspace <sawireless2000@xxxxxxxxx>]

On Dec 10, 6:42 pm, motor man <rdoct...@xxxxxxx> wrote:

> HI I need the cost to be far lower than a home security system as this
> will be used in many sites. It must also be wireless as the
> installations are temporary. Anyone with a great idea or anyone who
> would like to work on this project for $ please email me directly.

I think http://scratchpad.wikia.com/wiki/RadioModems#Zigbee modems is
your answer. http://www.lemosint.com/scripts/zigbee_etrx_module.asp
has I/O ports to which you can connect a halls effect switch, infrared
beam of PIR. See http://scratchpad.wikia.com/wiki/ConfiguringAlarmSystem#Circuit_links
for a PIC controlled intruder alarm circuit that was published in
April 2002 Everyday Electronics. This article will show you how to
connect a N/C device to the I/O port. The zigbee modems can be removed
and installed at any other place to provide you with the mobility that
you need. I would suggest you get hold of somebody that can make the
Zigbee modems from http://www.lemosint.com/scripts/zigbee_etrx_module.asp
actually work. If the 2.4ghz can't penetrate enough walls then bridge
two Zigbee modems using http://scratchpad.wikia.com/wiki/RS485 or use
the 433mhz range from http://scratchpad.wikia.com/wiki/RadioModems#433_mhz.