wireless alarm system

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braintronic

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hey guys...i need to make a security system in which there are IR detectors at multiple locations. and any one of should activate an alarm in some remote head quarter about some 200m distance through wireless link.please if anyone can guide me with circuit diagram and ideas,i l be grateful
 

The original wireless sensors have not enough power to cover distances of ≈ 200m ..

I'm not sure if that's the case, but you can hard-wire several IR sensors to one point and using a pair of radio-modems transmit info on the stage of the IR sensors to the head-quarters ..

Google for low-cost radio-modems with digital Input and/or Outputs ..
Here is an example – PICOLLO 433MHz:
https://www.esis.com.au/Modems-industrial/Radio_Modems.htm

Rgds,
IanP
 

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