Re: diy microwave alarm

[joe hey <joehey@xxxxxxxxxxxxxx>]

On Sat, 03 May 2014 01:28:52 -0500, G. Morgan wrote:

> joe hey Wrote:
>
>>On Fri, 02 May 2014 14:11:30 -0500, G. Morgan wrote:
>>
>>> joe hey Wrote:
>>>
>>>>(What is a 'PE beam'?)
>>>
>>> Photo-electric
>>
>>PE beams would be fine if they could span about 200 m in heavy rain.
>
>
> You would need an array, and if CCTV breaks the budget than PE beams are
> out of the question.

oh, my bad, I thought CCTV would just be more expensive than PE.
After all, I thought, PE is just an infrared emitting diode on the one,
and a receiving photo diode on the other side.

But maybe this is something useful?
http://www.aliexpress.com/item/P92-Wired-250M-Alarm-Triple-Beam-
Photoelectric-Infrared-LED-Detector-Tamper-Alarm-Output/1011069523.html
It would only require 6 of those sets to cover al sides...

Totalling about $380, wiring excluded!