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sesizoare de prezenta

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senzorii PIR detecteaza miscarea unei 'surse' calde in zona, se folosesc in toate alarmele de locuinte / firme etc, alimentare 12V, iesire releu eventual, gasesti la firmele care se ocupa de alarmetot PIR mai ieftin -au aparut pe la electrice lampi cu halogen care se aprind singure cand intri in zona lor, -SOLUTIE OPTIMAdaca vrei sa sapi, pui LED-uri infrarosu si fototranzistor infrarosu pe principiul reflexiei, trimiti o frecventa in LED si o astepti in fototranzistormai sunt pe principiul capacitiv, pui un electrod placa pe-acolo prin zona, pe care aplici o tensiune mare, (eventual de la retea printr-o rezistenta) cand se apropie o persoana apare o usoara crestere a curentului, o detectezi, compari eventual si asta esau capacitiv - inductiv in oscilatoare etcdepinde de mediul de lucru, de distante, etcde ex PIR pot fi pacalite de un catel uneori.

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Day or night, PIR devices detect motion by sensing any thermal contrast between a moving object or person and a stationary background. As a result, they?re being incorporated into a growing number of security devices.


citat din http://www.sensorsmag.com/articles/0403/35/main.shtml


care a iesit la prima strigare pe google, din alt site gasim indicatia ca diferenta de temperatura ar fi de minim 8 - 10 grade celsius, in zilele foarte calduroase cica senzorii PIR mai dau rateuri



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